A toll road , also known as a turnpike or tollway , is a public or private road for which a fee (or toll ) is assessed for passage. It is a form of road pricing typically implemented to help recoup the costs of road construction and maintenance .
120-743: The Peats Ferry Bridge is a steel truss bridge that carries the Pacific Highway (B83) across the Hawkesbury River , between Kangaroo Point and Mooney Mooney Point, located 40 kilometres (25 mi) north of Sydney in New South Wales , Australia . The bridge carries the Hornsby to Kariong section of highway, while the adjacent Brooklyn Bridge carries the Pacific Motorway (M1). The Peats Ferry Bridge
240-507: A transportation demand management tool to try to reduce traffic congestion and air pollution . Toll roads have existed for at least the last 2,700 years, as tolls had to be paid by travellers using the Susa – Babylon highway under the regime of Ashurbanipal , who reigned in the seventh century BC. Aristotle and Pliny refer to tolls in Arabia and other parts of Asia. In India, before
360-412: A BOS process is manufactured in one-twelfth the time. Today, electric arc furnaces (EAF) are a common method of reprocessing scrap metal to create new steel. They can also be used for converting pig iron to steel, but they use a lot of electrical energy (about 440 kWh per metric ton), and are thus generally only economical when there is a plentiful supply of cheap electricity. The steel industry
480-531: A brittle alloy commonly called pig iron . Alloy steel is steel to which other alloying elements have been intentionally added to modify the characteristics of steel. Common alloying elements include: manganese , nickel , chromium , molybdenum , boron , titanium , vanadium , tungsten , cobalt , and niobium . Additional elements, most frequently considered undesirable, are also important in steel: phosphorus , sulphur , silicon , and traces of oxygen , nitrogen , and copper . Plain carbon-iron alloys with
600-713: A carbon-intermediate steel by the 1st century AD. There is evidence that carbon steel was made in Western Tanzania by the ancestors of the Haya people as early as 2,000 years ago by a complex process of "pre-heating" allowing temperatures inside a furnace to reach 1300 to 1400 °C. Evidence of the earliest production of high carbon steel in South Asia is found in Kodumanal in Tamil Nadu ,
720-444: A change of volume. In this case, expansion occurs. Internal stresses from this expansion generally take the form of compression on the crystals of martensite and tension on the remaining ferrite, with a fair amount of shear on both constituents. If quenching is done improperly, the internal stresses can cause a part to shatter as it cools. At the very least, they cause internal work hardening and other microscopic imperfections. It
840-428: A ferrite BCC crystal form, but at higher carbon content it takes a body-centred tetragonal (BCT) structure. There is no thermal activation energy for the transformation from austenite to martensite. There is no compositional change so the atoms generally retain their same neighbours. Martensite has a lower density (it expands during the cooling) than does austenite, so that the transformation between them results in
960-602: A flat fee either when they enter or when they exit the toll road. In a variant of the closed toll system, mainline barriers are present at the two endpoints of the toll road, and each interchange has a ramp toll that is paid upon exit or entry. In this case, a motorist pays a flat fee at the ramp toll and another flat fee at the end of the toll road; no ticket is necessary. In addition, with most systems, motorists may pay tolls only with cash or change; debit and credit cards are not accepted. However, some toll roads may have travel plazas with ATMs so motorists can stop and withdraw cash for
1080-583: A hard oxide forms on the metal surface; this is known as stainless steel . Tungsten slows the formation of cementite , keeping carbon in the iron matrix and allowing martensite to preferentially form at slower quench rates, resulting in high-speed steel . The addition of lead and sulphur decrease grain size, thereby making the steel easier to turn , but also more brittle and prone to corrosion. Such alloys are nevertheless frequently used for components such as nuts, bolts, and washers in applications where toughness and corrosion resistance are not paramount. For
1200-445: A hard but brittle martensitic structure. The steel is then tempered, which is just a specialized type of annealing, to reduce brittleness. In this application the annealing (tempering) process transforms some of the martensite into cementite, or spheroidite and hence it reduces the internal stresses and defects. The result is a more ductile and fracture-resistant steel. When iron is smelted from its ore, it contains more carbon than
1320-434: A higher than 2.1% carbon content are known as cast iron . With modern steelmaking techniques such as powder metal forming, it is possible to make very high-carbon (and other alloy material) steels, but such are not common. Cast iron is not malleable even when hot, but it can be formed by casting as it has a lower melting point than steel and good castability properties. Certain compositions of cast iron, while retaining
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#17327836673311440-412: A narrow range of concentrations of mixtures of carbon and iron that make steel, several different metallurgical structures, with very different properties can form. Understanding such properties is essential to making quality steel. At room temperature , the most stable form of pure iron is the body-centred cubic (BCC) structure called alpha iron or α-iron. It is a fairly soft metal that can dissolve only
1560-534: A small concentration of carbon, no more than 0.005% at 0 °C (32 °F) and 0.021 wt% at 723 °C (1,333 °F). The inclusion of carbon in alpha iron is called ferrite . At 910 °C, pure iron transforms into a face-centred cubic (FCC) structure, called gamma iron or γ-iron. The inclusion of carbon in gamma iron is called austenite. The more open FCC structure of austenite can dissolve considerably more carbon, as much as 2.1%, (38 times that of ferrite) carbon at 1,148 °C (2,098 °F), which reflects
1680-442: A specific infrastructure (e.g. roads, bridges). These concepts were widely used until the last century. However, the evolution in technology made it possible to implement road tolling policies based on different concepts. The different charging concepts are designed to suit different requirements regarding purpose of the charge, charging policy, the network to the charge, tariff class differentiation, et cetera: Some toll roads charge
1800-453: A steel's final rolling, it is heat treated for strength; however, this is relatively rare. Steel was known in antiquity and was produced in bloomeries and crucibles . The earliest known production of steel is seen in pieces of ironware excavated from an archaeological site in Anatolia ( Kaman-Kalehöyük ) which are nearly 4,000 years old, dating from 1800 BC. Wootz steel
1920-477: A subsequent step. Other materials are often added to the iron/carbon mixture to produce steel with the desired properties. Nickel and manganese in steel add to its tensile strength and make the austenite form of the iron-carbon solution more stable, chromium increases hardness and melting temperature, and vanadium also increases hardness while making it less prone to metal fatigue . To inhibit corrosion, at least 11% chromium can be added to steel so that
2040-604: A toll in only one direction. Examples include the Sydney Harbour Bridge , Sydney Harbour Tunnel , and Eastern Distributor (these all charge tolls city-bound) in Australia, in the United States, crossings between Pennsylvania and New Jersey operated by Delaware River Port Authority and crossings between New Jersey and New York operated by Port Authority of New York and New Jersey . This technique
2160-555: A toll payer's transponder or uses automatic number-plate recognition to charge drivers by debiting their accounts. Criticisms of toll roads include the time taken to stop and pay the toll, and the cost of the toll booth operators—up to about one-third of revenue in some cases. Automated toll-paying systems help minimise both of these. Others object to paying "twice" for the same road, namely in fuel taxes and in tolls. In addition to toll roads, toll bridges and toll tunnels are also used by public authorities to generate funds to repay
2280-672: Is continuously cast into long slabs, cut and shaped into bars and extrusions and heat treated to produce a final product. Today, approximately 96% of steel is continuously cast, while only 4% is produced as ingots. The ingots are then heated in a soaking pit and hot rolled into slabs, billets , or blooms . Slabs are hot or cold rolled into sheet metal or plates. Billets are hot or cold rolled into bars, rods, and wire. Blooms are hot or cold rolled into structural steel , such as I-beams and rails . In modern steel mills these processes often occur in one assembly line , with ore coming in and finished steel products coming out. Sometimes after
2400-413: Is a single carriageway with one lane in each direction in state highway conditions; and permits the carriage of motor vehicles , pedestrians and bicycles . The adjacent Brooklyn Bridge is a dual carriageway with three lanes in each direction of motorway grade-separated conditions. Both bridges are maintained by Transport for NSW . Peats Ferry, a ferry operated by George Peat from 1847 until
2520-453: Is also cast in situ concrete but is believed not to act compositely with steel, as might be used in more modern construction. North of the bridge itself a causeway some 220 metres (722 ft) long was built in shallow water to complete the link to the northern bank. The Pier supporting the main bridge spans is founded on a concrete caisson. The cutting foot of the caisson was cast on a barge in sheltered water and then floated out and sunk to
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#17327836673312640-636: Is also very reusable: it is one of the world's most-recycled materials, with a recycling rate of over 60% globally . The noun steel originates from the Proto-Germanic adjective * * stahliją or * * stakhlijan 'made of steel', which is related to * * stahlaz or * * stahliją 'standing firm'. The carbon content of steel is between 0.02% and 2.14% by weight for plain carbon steel ( iron - carbon alloys ). Too little carbon content leaves (pure) iron quite soft, ductile, and weak. Carbon contents higher than those of steel make
2760-416: Is always the main element in steel, but many other elements may be present or added. Stainless steels , which are resistant to corrosion and oxidation , typically need an additional 11% chromium . Iron is the base metal of steel. Depending on the temperature, it can take two crystalline forms (allotropic forms): body-centred cubic and face-centred cubic . The interaction of the allotropes of iron with
2880-432: Is an alloy of iron and carbon with improved strength and fracture resistance compared to other forms of iron. Because of its high tensile strength and low cost, steel is one of the most commonly manufactured materials in the world. Steel is used in buildings, as concrete reinforcing rods, in bridges, infrastructure, tools, ships, trains, cars, bicycles, machines, electrical appliances, furniture, and weapons. Iron
3000-403: Is common for quench cracks to form when steel is water quenched, although they may not always be visible. There are many types of heat treating processes available to steel. The most common are annealing , quenching , and tempering . Annealing is the process of heating the steel to a sufficiently high temperature to relieve local internal stresses. It does not create a general softening of
3120-403: Is desirable. To become steel, it must be reprocessed to reduce the carbon to the correct amount, at which point other elements can be added. In the past, steel facilities would cast the raw steel product into ingots which would be stored until use in further refinement processes that resulted in the finished product. In modern facilities, the initial product is close to the final composition and
3240-405: Is extracted from iron ore by removing the oxygen through its combination with a preferred chemical partner such as carbon which is then lost to the atmosphere as carbon dioxide. This process, known as smelting , was first applied to metals with lower melting points, such as tin , which melts at about 250 °C (482 °F), and copper , which melts at about 1,100 °C (2,010 °F), and
3360-408: Is heat treated to contain both a ferritic and martensitic microstructure to produce a formable, high strength steel. Transformation Induced Plasticity (TRIP) steel involves special alloying and heat treatments to stabilize amounts of austenite at room temperature in normally austenite-free low-alloy ferritic steels. By applying strain, the austenite undergoes a phase transition to martensite without
3480-691: Is often considered an indicator of economic progress, because of the critical role played by steel in infrastructural and overall economic development . In 1980, there were more than 500,000 U.S. steelworkers. By 2000, the number of steelworkers had fallen to 224,000. The economic boom in China and India caused a massive increase in the demand for steel. Between 2000 and 2005, world steel demand increased by 6%. Since 2000, several Indian and Chinese steel firms have expanded to meet demand, such as Tata Steel (which bought Corus Group in 2007), Baosteel Group and Shagang Group . As of 2017 , though, ArcelorMittal
3600-488: Is one of the world's most-recycled materials, with a recycling rate of over 60% globally; in the United States alone, over 82,000,000 metric tons (81,000,000 long tons; 90,000,000 short tons) were recycled in the year 2008, for an overall recycling rate of 83%. As more steel is produced than is scrapped, the amount of recycled raw materials is about 40% of the total of steel produced - in 2016, 1,628,000,000 tonnes (1.602 × 10 long tons; 1.795 × 10 short tons) of crude steel
3720-603: Is practical where the detour to avoid the toll is large or the toll differences are small. Traditionally, tolls were paid by hand at a toll gate. Although payments may still be made in cash, it is more common now to pay using an electronic toll collection system. In some places, payment is made using transponders which are affixed to the windscreen. Three systems of toll roads exist: open (with mainline barrier toll plazas ); closed (with entry/exit tolls); and open road (no toll booths, only electronic toll collection gantries at entrances and exits or at strategic locations on
Peats Ferry Bridge - Misplaced Pages Continue
3840-564: Is the largest ETC system in the U.S., and is used for both fully tolled highways and tolled express lanes. Maryland Route 200 and the Triangle Expressway in North Carolina were the first toll roads built without toll booths, with drivers charged via ETC or by optical license plate recognition and are billed by mail. In addition, many older toll roads are also being upgraded to an all-electronic tolling system, abandoning
3960-547: Is the world's largest steel producer . In 2005, the British Geological Survey stated China was the top steel producer with about one-third of the world share; Japan , Russia , and the United States were second, third, and fourth, respectively, according to the survey. The large production capacity of steel results also in a significant amount of carbon dioxide emissions inherent related to
4080-655: The Golconda area in Andhra Pradesh and Karnataka , regions of India , as well as in Samanalawewa and Dehigaha Alakanda, regions of Sri Lanka . This came to be known as wootz steel , produced in South India by about the sixth century BC and exported globally. The steel technology existed prior to 326 BC in the region as they are mentioned in literature of Sangam Tamil , Arabic, and Latin as
4200-632: The Holy Roman Empire in the 14th and 15th centuries. After significant road construction undertaken by the West African kingdom of Dahomey , toll booths were also established with the function of collecting yearly taxes based on the goods carried by the people of Dahomey and their occupation. In some cases, officials imposed fines for public nuisance before allowing people to pass. Industrialisation in Europe needed major improvements to
4320-599: The cementation process was described in a treatise published in Prague in 1574 and was in use in Nuremberg from 1601. A similar process for case hardening armour and files was described in a book published in Naples in 1589. The process was introduced to England in about 1614 and used to produce such steel by Sir Basil Brooke at Coalbrookdale during the 1610s. The raw material for this process were bars of iron. During
4440-419: The hardness , quenching behaviour , need for annealing , tempering behaviour , yield strength , and tensile strength of the resulting steel. The increase in steel's strength compared to pure iron is possible only by reducing iron's ductility. Steel was produced in bloomery furnaces for thousands of years, but its large-scale, industrial use began only after more efficient production methods were devised in
4560-416: The "closed motorway system" (km travelled) or through the "open motorway system" (flat-rate toll). Given the multiplicity of operators, the toll is only requested when exiting the motorway and not when the motorway operator changes. This system was made possible following article 14 of law 531 of 12 August 1982. From a technical point of view, however, the mixed barrier/free-flow system is active where, at
4680-445: The 17th century, it was realized that the best steel came from oregrounds iron of a region north of Stockholm , Sweden. This was still the usual raw material source in the 19th century, almost as long as the process was used. Crucible steel is steel that has been melted in a crucible rather than having been forged , with the result that it is more homogeneous. Most previous furnaces could not reach high enough temperatures to melt
4800-475: The 17th century, the first step in European steel production has been the smelting of iron ore into pig iron in a blast furnace . Originally employing charcoal, modern methods use coke , which has proven more economical. In these processes, pig iron made from raw iron ore was refined (fined) in a finery forge to produce bar iron , which was then used in steel-making. The production of steel by
4920-573: The 17th century, with the introduction of the blast furnace and production of crucible steel . This was followed by the Bessemer process in England in the mid-19th century, and then by the open-hearth furnace . With the invention of the Bessemer process, a new era of mass-produced steel began. Mild steel replaced wrought iron . The German states were the major steel producers in Europe in
Peats Ferry Bridge - Misplaced Pages Continue
5040-717: The 1890s, provided a local crossing of the Hawkesbury River: at that time there was no direct road between Sydney and Newcastle. The ferry service was made redundant by the completion of the Main Northern railway line in 1889 with the opening of the first Hawkesbury River railway bridge. Between 1925 and 1930 the New South Wales Public Works Department, and subsequently the Main Roads Board , undertook construction of
5160-481: The 19th century. American steel production was centred in Pittsburgh , Bethlehem, Pennsylvania , and Cleveland until the late 20th century. Currently, world steel production is centered in China, which produced 54% of the world's steel in 2023. Further refinements in the process, such as basic oxygen steelmaking (BOS), largely replaced earlier methods by further lowering the cost of production and increasing
5280-474: The 19th century. Roads radiating from Toronto required users to pay at toll gates along the street ( Yonge Street , Bloor Street , Davenport Road , Kingston Road ) but the toll gates disappeared after 1895. In the eastern United States of the 18th and 19th century, hundreds of private turnpikes were created to facilitate travel between towns and cities, typically outside built-up areas. 19th-century plank roads were usually operated as toll roads. One of
5400-608: The Arabs from Persia, who took it from India. It was originally created from several different materials including various trace elements , apparently ultimately from the writings of Zosimos of Panopolis . In 327 BC, Alexander the Great was rewarded by the defeated King Porus , not with gold or silver but with 30 pounds of steel. A recent study has speculated that carbon nanotubes were included in its structure, which might explain some of its legendary qualities, though, given
5520-577: The BOT methodology for future highway projects. The more traditional means of managing toll roads in the United States is through semi-autonomous public authorities . Kansas , Maryland , Massachusetts , New Hampshire , New Jersey , New York , North Carolina , Ohio , Oklahoma , Pennsylvania , and West Virginia manage their toll roads in this manner. While most of the toll roads in California, Delaware, Florida, Texas, and Virginia are operating under
5640-470: The Linz-Donawitz process of basic oxygen steelmaking (BOS), developed in 1952, and other oxygen steel making methods. Basic oxygen steelmaking is superior to previous steelmaking methods because the oxygen pumped into the furnace limited impurities, primarily nitrogen, that previously had entered from the air used, and because, with respect to the open hearth process, the same quantity of steel from
5760-578: The Pacific Highway route as a backup and alternative route to the motorway, and provides access from the motorway to the towns of Brooklyn and Mooney Mooney, and to Mount White. Peat's Ferry Road Bridge is of State significance owing to its historical associations and technical and engineering qualities. It was constructed between 1938 and 1945 and the current bridge fabric is original to the 1945 construction. The original parapets, however, have been partly removed and have had Armco barriers added over
5880-793: The South to the North. The road connects the southwest of the city, including the Sea Port area, with the Ring Road, Vasilievsky Island, Kurortny district and the Scandinavia motorway. The WHSD is divided into three sections: Southern, Central and Northern. The entire stretch of the WHSD was opened for traffic in 2016. There are 16 toll plazas on the WHSD. Paying toll by transponder is mostly recommended for frequent drivers. The Flow+ toll collection system
6000-464: The U.S. saw large road building projects in major urban areas. Electronic toll collection, first introduced in the 1980s, reduces operating costs by removing toll collectors from roads. Tolled express lanes, by which certain lanes of a freeway are designated "toll only", increases revenue by allowing a free-to-use highway to collect revenue by allowing drivers to bypass traffic jams by paying a toll. The E-ZPass system, compatible with many state systems,
6120-435: The addition of heat. Twinning Induced Plasticity (TWIP) steel uses a specific type of strain to increase the effectiveness of work hardening on the alloy. Toll road Toll roads have existed in some form since antiquity , with tolls levied on passing travelers on foot, wagon, or horseback; a practice that continued with the automobile, and many modern tollways charge fees for motor vehicles exclusively. The amount of
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#17327836673316240-601: The aid of concessions, allowing rapid development of this infrastructure without massive state debts. Since then, road tolls have been introduced in the majority of the EU member states. In the United States, prior to the introduction of the Interstate Highway System and the large federal grants supplied to states to build it, many states constructed their first freeways by floating bonds backed by toll revenues. The first major fully grade separated toll road
6360-401: The alloying elements, primarily carbon, gives steel and cast iron their range of unique properties. In pure iron, the crystal structure has relatively little resistance to the iron atoms slipping past one another, and so pure iron is quite ductile , or soft and easily formed. In steel, small amounts of carbon, other elements, and inclusions within the iron act as hardening agents that prevent
6480-436: The austenite grain boundaries until the percentage of carbon in the grains has decreased to the eutectoid composition (0.8% carbon), at which point the pearlite structure forms. For steels that have less than 0.8% carbon (hypoeutectoid), ferrite will first form within the grains until the remaining composition rises to 0.8% of carbon, at which point the pearlite structure will form. No large inclusions of cementite will form at
6600-471: The austenite is for it to precipitate out of solution as cementite , leaving behind a surrounding phase of BCC iron called ferrite with a small percentage of carbon in solution. The two, cementite and ferrite, precipitate simultaneously producing a layered structure called pearlite , named for its resemblance to mother of pearl . In a hypereutectoid composition (greater than 0.8% carbon), the carbon will first precipitate out as large inclusions of cementite at
6720-497: The beltways around some larger cities ( tangenziali ) which are not part of a thoroughfare motorway, and the Autostrada A2 between Salerno and Reggio di Calabria which is operated by the government-owned ANAS . Both are toll free. On Italian motorways, the toll applies to almost all motorways not managed by Anas . The collection of motorway tolls, from a tariff point of view, is managed mainly in two ways: either through
6840-494: The boundaries in hypoeutectoid steel. The above assumes that the cooling process is very slow, allowing enough time for the carbon to migrate. As the rate of cooling is increased the carbon will have less time to migrate to form carbide at the grain boundaries but will have increasingly large amounts of pearlite of a finer and finer structure within the grains; hence the carbide is more widely dispersed and acts to prevent slip of defects within those grains, resulting in hardening of
6960-766: The brand I-Pass in Illinois ) is accepted on almost all toll roads. Similar systems include SunPass in Florida , FasTrak in California , Good to Go in Washington state , and ExpressToll in Colorado . The systems use a small radio transponder mounted in or on a customer's vehicle to deduct toll fares from a pre-paid account as the vehicle passes through the toll barrier. This reduces manpower at toll booths and increases traffic flow and fuel efficiency by reducing
7080-461: The centre of the city tolled. In the United States, as states looked for ways to construct new freeways without federal funding again, to raise revenue for continued road maintenance, and to control congestion, new toll road construction saw significant increases during the first two decades of the 21st century. Spurred on by two innovations, the electronic toll collection system, and the advent of high-occupancy and express lane tolls , many areas of
7200-455: The combination, bronze, which has a melting point lower than 1,083 °C (1,981 °F). In comparison, cast iron melts at about 1,375 °C (2,507 °F). Small quantities of iron were smelted in ancient times, in the solid-state, by heating the ore in a charcoal fire and then welding the clumps together with a hammer and in the process squeezing out the impurities. With care, the carbon content could be controlled by moving it around in
7320-403: The cost of building the structures. Some tolls are set aside to pay for future maintenance or enhancement of infrastructure, or are applied as a general fund by local governments, not being earmarked for transport facilities. This is sometimes limited or prohibited by central government legislation. Also, road congestion pricing schemes have been implemented in a limited number of urban areas as
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#17327836673317440-410: The distance travelled. Motorway barriers are arranged along the route (however not at every junction), at which the user pays a fixed sum, depending only on the class of the vehicle. The user can therefore travel along sections of the motorway without paying any toll as the barriers may not be present on the section travelled. Road tolls were levied traditionally for a specific access (e.g. city) or for
7560-452: The economies of melting and casting, can be heat treated after casting to make malleable iron or ductile iron objects. Steel is distinguishable from wrought iron (now largely obsolete), which may contain a small amount of carbon but large amounts of slag . Iron is commonly found in the Earth's crust in the form of an ore , usually an iron oxide, such as magnetite or hematite . Iron
7680-406: The entrance and exit from the motorways, there are lanes dedicated to the collection of a ticket (on entry) and the delivery of the ticket with simultaneous payment (on exit) and other lanes where, during transit without the need to stop, an electronic toll system present in the vehicles records the data and debits the toll, generally into the bank account previously communicated by the customer, to
7800-600: The establishment of the Interstate Highway System in the late 1950s, toll road construction in the U.S. slowed down considerably, as the federal government now provided the bulk of funding to construct new freeways, and regulations required that such Interstate highways be free from tolls. Many older toll roads were added to the Interstate System under a grandfather clause that allowed tolls to continue to be collected on toll roads that predated
7920-642: The event includes the first quarter collected at its toll booths. The first major deployment of an RFID electronic toll collection system in the United States was on the Dallas North Tollway in 1989 by Amtech (see TollTag ). The Amtech RFID technology used on the Dallas North Tollway was originally developed at Sandia Labs for use in tagging and tracking livestock. In the same year, the Telepass active transponder RFID system
8040-648: The finest steel in the world exported to the Roman, Egyptian, Chinese and Arab worlds at that time – what they called Seric Iron . A 200 BC Tamil trade guild in Tissamaharama , in the South East of Sri Lanka, brought with them some of the oldest iron and steel artifacts and production processes to the island from the classical period . The Chinese and locals in Anuradhapura , Sri Lanka had also adopted
8160-579: The fire. Unlike copper and tin, liquid or solid iron dissolves carbon quite readily. All of these temperatures could be reached with ancient methods used since the Bronze Age . Since the oxidation rate of iron increases rapidly beyond 800 °C (1,470 °F), it is important that smelting take place in a low-oxygen environment. Smelting, using carbon to reduce iron oxides, results in an alloy ( pig iron ) that retains too much carbon to be called steel. The excess carbon and other impurities are removed in
8280-549: The first US motor roads, the Long Island Motor Parkway (which opened on October 10, 1908) was built by William Kissam Vanderbilt II, the great-grandson of Cornelius Vanderbilt . The road was closed in 1938 when it was taken over by the state of New York in lieu of back taxes. The first toll road in St. Petersburg appeared in the 2000s. The Western High-Speed Diameter (WHSD) is a multilane motorway running from
8400-437: The first authorization to build a public-utility fast road in 1921, and completed the construction (one lane in each direction) between 1924 and 1926. Piero Puricelli decided to cover the expenses by introducing a toll. It was followed by Greece, which made users pay for the network of motorways around and between its cities in 1927. Later in the 1950s and 1960s, France, Spain, and Portugal started to build motorways largely with
8520-513: The form of charcoal) in a crucible, was produced in Merv by the 9th to 10th century AD. In the 11th century, there is evidence of the production of steel in Song China using two techniques: a "berganesque" method that produced inferior, inhomogeneous steel, and a precursor to the modern Bessemer process that used partial decarburization via repeated forging under a cold blast . Since
8640-615: The fourth century BC, the Arthashastra notes the use of tolls. Germanic tribes charged tolls to travellers across mountain passes . Most roads were not freely open to travel on in Europe during the Middle Ages, and the toll was one of many feudal fees paid for rights of usage in everyday life. Some major European "highways", such as the Via Regia and Via Imperii , offered protection to travelers in exchange for paying
8760-431: The girder spans of the bridge. The rails to the two truss spans of the bridge were modified in 1966 by the removal of the tubular rails and crimped wire mesh and substitution with Armco type barriers bolted to the original steel angle standards. This was done in conjunction with the reconfiguration of the lanes to provide a third lane for tidal flow arrangements. The bridge has two plaques at its south abutment commemorating
8880-599: The hardenability of thick sections. High strength low alloy steel has small additions (usually < 2% by weight) of other elements, typically 1.5% manganese, to provide additional strength for a modest price increase. Recent corporate average fuel economy (CAFE) regulations have given rise to a new variety of steel known as Advanced High Strength Steel (AHSS). This material is both strong and ductile so that vehicle structures can maintain their current safety levels while using less material. There are several commercially available grades of AHSS, such as dual-phase steel , which
9000-467: The highway the first all-automated toll highway in the world. A bill is mailed monthly for usage of the 407. Lower charges are levied on frequent 407 users who carry electronic transponders in their vehicles. The approach has not been without controversy: In 2003 the 407 ETR settled a class action with a refund to users. Throughout most of the East Coast of the United States, E-ZPass (operated under
9120-405: The highway. In some cases, the ticket displays the toll to be paid on exit. Upon exit, the driver must pay the amount listed for the given exit. Should the ticket be lost, a driver must typically pay the maximum amount possible for travel on that highway. Short toll roads with no intermediate entries or exits may have only one toll plaza at one end, with motorists travelling in either direction paying
9240-806: The hybrid systems they adopted during the late 20th century. These include the Massachusetts Turnpike , one of the oldest American toll roads, which went all-electronic in 2016, and the Pennsylvania Turnpike , America's oldest toll freeway, which went all-electronic in 2020, along with the Illinois Tollway , which both accelerated their transitions to such due to the COVID-19 pandemic . Turnpike trusts were established in England and Wales from about 1706 in response to
9360-438: The longest welded truss spans in the world when built. The deck of the truss spans in concrete, cast in situ around the truss members. The truss spans were fabricated off site and floated into position on barges, requiring a high degree of accuracy and coordination in fabrication and bridge pier setting out. To the north of the truss spans, the bridge has eight long and eight short steel girder spans. The bridge deck to these spans
9480-439: The main production route. At the end of 2008, the steel industry faced a sharp downturn that led to many cut-backs. In 2021, it was estimated that around 7% of the global greenhouse gas emissions resulted from the steel industry. Reduction of these emissions are expected to come from a shift in the main production route using cokes, more recycling of steel and the application of carbon capture and storage technology. Steel
9600-400: The mainline toll plazas (toll barriers). It is also possible for motorists to enter an 'open toll road' after one toll barrier and exit before the next one, thus travelling on the toll road toll-free. Most open toll roads have ramp tolls or partial access junctions to prevent this practice, known in the U.S. as " shunpiking ". With a closed toll system, vehicles collect a ticket when entering
9720-523: The maintenance and improvement of most of the main roads in England and Wales, which were used to distribute agricultural and industrial goods economically. The tolls were a source of revenue for road building and maintenance, paid for by road users and not from general taxation. The turnpike trusts were gradually abolished from the 1870s. Most trusts improved existing roads, but some new roads, usually only short stretches, were also built. Thomas Telford 's Holyhead road followed Watling Street from London but
9840-461: The manager of his device. In Italy, this occurs through the Autostrade per l'Italia interchange system. The Autostrada A36 , Autostrada A59 and Autostrada A60 are exclusively free-flow. On these motorways, those who do not have the electronic toll device on board must proceed with the payment by subsequently communicating the data to the motorway manager (by telephone, online or by going to
9960-409: The median of the road). Some toll roads use a combination of the three systems. On an open toll system, all vehicles stop at various locations along the highway to pay a toll. (This is different from "open road tolling", where no vehicles stop to pay a toll.) While this may save money from the lack of need to construct toll booths at every exit, it can cause traffic congestion while traffic queues at
10080-577: The most direct road route between Sydney and Newcastle was via the Old Northern Road via Wisemans Ferry and Cessnock, built in the 1820s. The Sydney-Hornsby-Gosford-Newcastle route was named as part of the Great Northern Highway in 1928, and renamed as part of the Pacific Highway in 1931. The two main bridge spans are K-trusses of welded steel construction. Each truss span measures 130 metres (430 ft) long and these were
10200-450: The most part, however, p-block elements such as sulphur, nitrogen , phosphorus , and lead are considered contaminants that make steel more brittle and are therefore removed from steel during the melting processing. The density of steel varies based on the alloying constituents but usually ranges between 7,750 and 8,050 kg/m (484 and 503 lb/cu ft), or 7.75 and 8.05 g/cm (4.48 and 4.65 oz/cu in). Even in
10320-423: The motorways subject to toll payment must only proceed at a maximum speed of 30 kilometres per hour (20 mph) without the need to stop. The amount is directly proportional to the distance travelled by the vehicle, the coefficient of its class and a variable coefficient from motorway to motorway, called the kilometre rate. Unlike the closed motorway system, in the open system, the road user does not pay based on
10440-446: The movement of dislocations . The carbon in typical steel alloys may contribute up to 2.14% of its weight. Varying the amount of carbon and many other alloying elements, as well as controlling their chemical and physical makeup in the final steel (either as solute elements, or as precipitated phases), impedes the movement of the dislocations that make pure iron ductile, and thus controls and enhances its qualities. These qualities include
10560-549: The need for better roads than the few and poorly-maintained tracks then available. Turnpike trusts were set up by individual Acts of Parliament , with powers to collect road tolls to repay loans for building, improving, and maintaining the principal roads in Britain . At their peak, in the 1830s, over 1,000 trusts administered around 30,000 miles (48,000 km) of turnpike road in England and Wales, taking tolls at almost 8,000 toll-gates. The trusts were ultimately responsible for
10680-409: The need for complete stops to pay tolls at these locations. By designing a toll gate specifically for electronic collection, it is possible to carry out open-road tolling, where the customer does not need to slow at all when passing through the toll gate. The U.S. state of Texas is using a system that has no toll booths. Drivers without a TollTag have their license plate photographed automatically and
10800-699: The northeastern United States, the InterCounty Connector ( Maryland Route 200 ) was partially opened to traffic in February 2011, and the final segment was completed in November 2014. The first section of another all-electronic toll road, the Triangle Expressway , opened at the beginning of 2012 in North Carolina. Some toll roads are managed under such systems as the Build-Operate-Transfer (BOT) system. Private companies build
10920-399: The offices dedicated to payment). The closed motorway system is applied to most Italian motorways. It requires the driver of the vehicle to collect a special ticket at the entrance to the motorway and pay the amount due upon exit. If equipped with an electronic toll system the two procedures are completely automatic and the driver on the detection lanes located at the entrances and exits from
11040-619: The opening of the bridge in 1945 and the "energy and skill of its builders". A toll was levied on crossing the bridge, payable at the Mooney Mooney Point end of the bridge. The bridge was superseded as the main crossing of the Hawkesbury River at this point by the opening of the adjacent six-lane motorway bridge as part of the fourth stage of the Pacific Motorway in 1973. It continues in service carrying
11160-507: The original interstate system funding. Houston's outer beltway of interconnected toll roads began in 1983, and many states followed over the last two decades of the 20th century adding new toll roads, including the tollway system around Orlando, Florida , Colorado's E-470 , and Georgia State Route 400 . London, in an effort to reduce traffic within the city, instituted the London congestion charge in 2003, effectively making all roads within
11280-449: The product but only locally relieves strains and stresses locked up within the material. Annealing goes through three phases: recovery , recrystallization , and grain growth . The temperature required to anneal a particular steel depends on the type of annealing to be achieved and the alloying constituents. Quenching involves heating the steel to create the austenite phase then quenching it in water or oil . This rapid cooling results in
11400-759: The production methods of creating wootz steel from the Chera Dynasty Tamils of South India by the 5th century AD. In Sri Lanka, this early steel-making method employed a unique wind furnace, driven by the monsoon winds, capable of producing high-carbon steel. Since the technology was acquired from the Tamilians from South India, the origin of steel technology in India can be conservatively estimated at 400–500 BC. The manufacture of wootz steel and Damascus steel , famous for its durability and ability to hold an edge, may have been taken by
11520-426: The quality of the final product. Today more than 1.6 billion tons of steel is produced annually. Modern steel is generally identified by various grades defined by assorted standards organizations . The modern steel industry is one of the largest manufacturing industries in the world, but also one of the most energy and greenhouse gas emission intense industries, contributing 8% of global emissions. However, steel
11640-576: The registered owner will receive a monthly bill, at a higher rate than those vehicles with TollTags. A similar variation of automatic collection is the Toll Roads in Orange County, CA, US, wherein all entry or collection points are equipped with high-speed cameras which read license plates and users will have 7 calendar days to pay online using their plate number or else set up an account for automatic debits. The first all-electronic toll road in
11760-490: The river bed within its own cofferdam. Jetting with compressed air and the addition of further sections of caisson then further sank the caisson. At one point the caisson accidentally slid under its own weight to below the water line. To recover this situation a further section had to be added by divers and the caisson pumped out, which took nine months to complete. The final caisson extends 73.56 metres (241.3 ft) below low water level, just 20 centimetres (7.9 in) short of
11880-478: The road between Hornsby and Gosford, in order to provide a direct road route between Sydney and Newcastle. Upon completion of the roadworks in 1930 Peats Ferry was reinstated between Kangaroo Point and Mooney Mooney Point, pending construction of the bridge. Construction of the bridge commenced in 1938 but it was not completed until May 1945. Prior to construction of the Hornsby-Gosford road via Peats ferry
12000-647: The roads and are given a limited franchise. Ownership is transferred to the government when the franchise expires. This type of arrangement is prevalent in Australia, Canada, Hong Kong, Indonesia, India, South Korea, Japan, and the Philippines . The BOT system is a fairly new concept that is becoming more popular in the United States, with California , Delaware , Florida , Illinois , Indiana , Mississippi , Texas , and Virginia already building and operating toll roads under this scheme. Pennsylvania , Massachusetts , New Jersey , and Tennessee are also considering
12120-528: The royal toll. Many modern European roads were originally constructed as toll roads in order to recoup the costs of construction and maintenance, and to generate revenue from passing travelers. In 14th-century England, some of the most heavily used roads were repaired with money raised from tolls by pavage grants. Widespread toll roads sometimes restricted traffic so much, by their high tolls, that they interfered with trade and cheap transportation needed to alleviate local famines or shortages. Tolls were used in
12240-401: The steel. At the very high cooling rates produced by quenching, the carbon has no time to migrate but is locked within the face-centred austenite and forms martensite . Martensite is a highly strained and stressed, supersaturated form of carbon and iron and is exceedingly hard but brittle. Depending on the carbon content, the martensitic phase takes different forms. Below 0.2% carbon, it takes on
12360-561: The steel. The early modern crucible steel industry resulted from the invention of Benjamin Huntsman in the 1740s. Blister steel (made as above) was melted in a crucible or in a furnace, and cast (usually) into ingots. The modern era in steelmaking began with the introduction of Henry Bessemer 's process in 1855, the raw material for which was pig iron. His method let him produce steel in large quantities cheaply, thus mild steel came to be used for most purposes for which wrought iron
12480-569: The system. Some of these such as the Connecticut Turnpike and the Richmond–Petersburg Turnpike later removed their tolls when the initial bonds were paid off. Many states, however, have maintained the tolling of these roads as a consistent source of revenue. As the Interstate Highway System approached completion during the 1980s, states began constructing toll roads again to provide new freeways which were not part of
12600-561: The technology of that time, such qualities were produced by chance rather than by design. Natural wind was used where the soil containing iron was heated by the use of wood. The ancient Sinhalese managed to extract a ton of steel for every 2 tons of soil, a remarkable feat at the time. One such furnace was found in Samanalawewa and archaeologists were able to produce steel as the ancients did. Crucible steel , formed by slowly heating and cooling pure iron and carbon (typically in
12720-545: The toll usually varies by vehicle type, weight, or number of axles , with freight trucks often charged higher rates than cars. Tolls are often collected at toll plazas, toll booths , toll houses , toll stations, toll bars, toll barriers, or toll gates. Some toll collection points are automatic, and the user deposits money in a machine which opens the gate once the correct toll has been paid. To cut costs and minimise time delay, many tolls are collected with electronic toll collection equipment which automatically communicates with
12840-668: The tolls. The toll is calculated by the distance travelled on the toll road or the specific exit chosen. In the United States, for instance, the Kansas Turnpike , Ohio Turnpike , New Jersey Turnpike , most of the Indiana Toll Road , New York State Thruway , and Florida's Turnpike currently implement closed systems. The Union Toll Plaza on the Garden State Parkway was the first ever to use an automated toll collection machine. A plaque commemorating
12960-482: The transport infrastructure which included many new or substantially improved roads, financed from tolls. The A5 road in Britain was built to provide a robust transport link between Britain and Ireland and had a toll house every few miles. In the 20th century, road tolls were introduced in Europe to finance the construction of motorway networks and specific transport infrastructure such as bridges and tunnels. Italy
13080-488: The truss span lengths. The bridge is at the site of the ferry crossing first established by George Peat in 1847. From 1945 until 1980s, when the Sydney to Newcastle Freeway was built, the current bridge provided a direct and vital link from Sydney to the industrial north. The bridge received a Historic Engineering Marker from Engineers Australia as part of its Engineering Heritage Recognition Program . Steel Steel
13200-525: The upper carbon content of steel, beyond which is cast iron. When carbon moves out of solution with iron, it forms a very hard, but brittle material called cementite (Fe 3 C). When steels with exactly 0.8% carbon (known as a eutectoid steel), are cooled, the austenitic phase (FCC) of the mixture attempts to revert to the ferrite phase (BCC). The carbon no longer fits within the FCC austenite structure, resulting in an excess of carbon. One way for carbon to leave
13320-523: The world record depth for a bridge foundation at that time, held by the San Francisco–Oakland Bay Bridge . The bridge abutments are cast in situ concrete bearing to rock. Each abutment has concrete walls and parapets (balustrades). The original railings to the east and west sides of the bridge spans were tubular top and bottom rails supported to steel angle standards with crimped wire mesh infill panels. These original rails still exist to
13440-664: Was developed in Southern India and Sri Lanka in the 1st millennium BCE. Metal production sites in Sri Lanka employed wind furnaces driven by the monsoon winds, capable of producing high-carbon steel. Large-scale wootz steel production in India using crucibles occurred by the sixth century BC, the pioneering precursor to modern steel production and metallurgy. High-carbon steel was produced in Britain at Broxmouth Hillfort from 490–375 BC, and ultrahigh-carbon steel
13560-809: Was exceptional in creating a largely new route beyond Shrewsbury , and especially beyond Llangollen . Built in the early 19th century, with many toll booths along its length, most of it is now the A5 . In the modern day, one major toll road is the M6 Toll , relieving traffic congestion on the M6 in Birmingham. A few notable bridges and tunnels continue as toll roads including the Dartford Crossing and Mersey Gateway bridge. Some cities in Canada had toll roads in
13680-509: Was formerly used. The Gilchrist-Thomas process (or basic Bessemer process ) was an improvement to the Bessemer process, made by lining the converter with a basic material to remove phosphorus. Another 19th-century steelmaking process was the Siemens-Martin process , which complemented the Bessemer process. It consisted of co-melting bar iron (or steel scrap) with pig iron. These methods of steel production were rendered obsolete by
13800-451: Was implemented on the WHSD. The system was designed for automatic calculation of the driving distance of a vehicle equipped with a transponder. The system does not require constructing toll plazas at each entrance to or exit from the highway. Transponders mounted on vehicles are read by signal receivers installed at the entrance and exit ramps. In Italy the only toll roads are the autostrade (Italian for motorways ). Major exceptions are
13920-416: Was introduced across Italy. Several US states now use mobile tolling platforms to facilitate use of payment via smartphones. Highway 407 in the province of Ontario , Canada, has no toll booths, and instead reads a transponder mounted on the windshields of each vehicle using the road (the rear licence plates of vehicles lacking a transponder are photographed when they enter and exit the highway). This made
14040-438: Was produced globally, with 630,000,000 tonnes (620,000,000 long tons; 690,000,000 short tons) recycled. Modern steels are made with varying combinations of alloy metals to fulfil many purposes. Carbon steel , composed simply of iron and carbon, accounts for 90% of steel production. Low alloy steel is alloyed with other elements, usually molybdenum , manganese, chromium, or nickel, in amounts of up to 10% by weight to improve
14160-757: Was produced in the Netherlands from the 2nd-4th centuries AD. The Roman author Horace identifies steel weapons such as the falcata in the Iberian Peninsula , while Noric steel was used by the Roman military . The Chinese of the Warring States period (403–221 BC) had quench-hardened steel, while Chinese of the Han dynasty (202 BC—AD 220) created steel by melting together wrought iron with cast iron, thus producing
14280-788: Was the Pennsylvania Turnpike in 1940. This was followed up by other toll roads, such as the Maine Turnpike in 1947, the Blue Star Turnpike in 1950, the New Jersey Turnpike in 1951, the Garden State Parkway in 1952, the West Virginia Turnpike and New York State Thruway in 1954, the Massachusetts Turnpike in 1957, and the Chicago Skyway and Indiana Toll Road in 1958. Other toll roads were also established around this time. With
14400-490: Was the first country in the world to build motorways reserved for fast traffic and for motor vehicles only. The Autostrada dei Laghi ("Lakes Motorway"), the first built in the world, connecting Milan to Lake Como and Lake Maggiore , and now parts of the Autostrada A8 and Autostrada A9 , was devised by Piero Puricelli and was inaugurated in 1924. Piero Puricelli, a civil engineer and entrepreneur, received
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