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63-490: The name Hampstead Bypass refers to two bypasses in the United States : A portion of Maryland Route 30 around Hampstead, Maryland A planned route in the U.S. state of North Carolina, serving as a bypass of Ogden and Hampstead along U.S. Route 17 [REDACTED] Topics referred to by the same term This disambiguation page lists articles about roads and streets with

126-407: A divided highway ( AmE ) is a class of highway with carriageways for traffic travelling in opposite directions separated by a central reservation (BrE) or median (AmE). Roads with two or more carriageways which are designed to higher standards with controlled access are generally classed as motorways , freeways, etc., rather than dual carriageways. A road without a central reservation is known as

189-428: A single carriageway regardless of how many lanes there are. Dual carriageways have improved road traffic safety over the years and over single carriageways and typically have higher speed limits as a result. In some places, express lanes and local or collector lanes are used within a local-express-lane system to provide more capacity and to smooth out traffic flows for longer-distance travel. A very early (perhaps

252-414: A broken line indicating passing zones and a solid line indicating no passing zones and solid white baseline shoulder stripes. On undivided roads with more than one lane in each direction, the center is normally marked with a double solid line. The double solid stripe denotes that it is illegal to pass on the other side of the center line. Multilane one-way carriageways use broken white lines between lanes;

315-478: A built up area is indicated by the presence of street lights; on lit dual carriageways that are not considered to be in a built-up area, the speed limit will be clarified with intermittent signs. Although in Ireland the term dual carriageway technically applies to any road with physically separated lanes, it is usually used only to refer to those route sections that do not have a motorway designation. Most often it

378-538: A built-up area and/or as replacement for roads that became obsolete and inactive because devastating natural disasters — those who oppose the development of (often rural) undeveloped land. A city may also oppose the project, because of the potential reduction in city core. In Ontario , examples include the Donald Cousens Parkway (formerly named the Markham Bypass from 2004 to 2006) and

441-424: A bypass, converting it into an ordinary town road, and the bypass may eventually become as congested as the local streets it was intended to avoid. Many businesses are often built there for ease of access, while homes are often avoided for noise and pollution reasons. Bypass routes are often on new land where no road originally existed. This creates a conflict between those who support a bypass to reduce congestion in

504-582: A central median, usually fitted with guardrails. The most heavily used expressways in Croatia is the D10 road , connecting capital Zagreb to Vrbovec and Križevci . In the United States, this type of road may be called a divided highway, boulevard, parkway, expressway, freeway, or interstate, and has a grassy median or Jersey barrier separating the traffic directions. With few exceptions, all roads in

567-484: A freeway from the 1950s to 1970s. Opened to traffic in 1940, the 160-mile-long (260 km) Pennsylvania Turnpike was the first rural dual carriageway built in the United States. By 1955 several states had built dual carriageway freeways and turnpikes and in 1957 the Interstate Highway System began. Completed in 1994, the major highway system links all the major cities of the United States. In

630-467: A lack of funding elsewhere, partial controlled-access "expressways" and limited-mobility divided arterial roads are more common in the western provinces where there are no specially numbered systems of freeways. On some portions of Ontario 's 400-series highway network, the median may be either steel guardrail or an Ontario tall-wall barrier rather than an unpaved strip, particularly in urban areas. Some partial limited-access divided highways such as

693-502: A median barrier preventing left turns (motorists have to use a "turnabout" overpass to access exits on the opposing direction). Speed limits in Canada are usually 80 to 90 km/h on signalized divided highways and 100 to 120 km/h on freeways. In Australia, dual carriageways are referred to in some regions as divided roads, though there is no official terminology. Each state's road agency has its own definition of what constitutes

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756-501: A narrow strip of trees down the middle. In 1907 the Long Island Motor Parkway opened, and roughly 20% of it featured a semi-dual-carriageway design. The New York City Belt Parkway system, which was built between 1907 and 1934, also pioneered the same design. However the majority of it featured concrete or brick railings as lane dividers instead of grass medians. In the year of 1924 the first Italian autostrada

819-605: A new standard was set to designate certain high-quality routes formally as "Expressways". Many roads such as the A1 , the A14 , the A19 and the A42 are built to a high quality, with grade-separated junctions, full barriers at roadside and central reservations and, in some cases, three lanes of traffic. They may still fall short of motorway standard in terms of hard shoulders, the height of overpasses or

882-500: A precedent for future highways. Although it, like the first autostrada , did not feature a dual-carriageway design, it inspired the mass construction of future high-speed roadways. During the 1930s, Germany, Italy, and the Soviet Union began construction of a network of dual carriageway expressways. By 1942, Germany had over 3,200 km (2,000 mi) of dual carriageway roads, Italy had nearly 1,300 km (810 mi), and

945-416: A result of their misjudging the speed of approaching traffic on the other carriageway when doing so. The majority of dual carriageway roads now have barriers. Some are heavy concrete obstructions which can bounce a vehicle back into the path of other traffic; others are made from steel ropes mounted on moderately weak posts, where the rope cuts into the vehicle body to slow the vehicle while keeping it against

1008-510: Is autovía (literally autoway ). All of them are government-owned and not tolled. First-generation autovías, built in the 1980s and early 1990s, were just duplications in parallel of existing roads, as shown in the photograph. Modern autovías are two carriageways built from scratch, leaving the old road they replace as an alternative route for pedestrians, bicycles and other non-motorized vehicles. Private properties may have direct access to an autovía, as well as bus stops and gas stations in

1071-399: Is national roads (roads with a route number prefix of N ; e.g. N8 ) that are built as or upgraded to dual carriageway. A number of non-national roads (for example, regional roads ) are dual carriageway, for example in urban areas near or in cities, or where the road was part of a national route. Dual carriageways of this class differ from motorways in a number of ways. The hard shoulder

1134-495: Is a series of tunnels between Central and Causeway Bay . Malaysia also contain several bypasses such as Rawang Bypass , Kajang Bypass , Bidor Bypass and Kuala Terengganu Bypass . Bypass roads (or in other cases "diversion roads") in the Philippines are generally considered on national highways passing through a densely populated city or municipality. Local governments usually promote construction of bypasses where

1197-508: Is also sometimes used to refer to a short temporary roadway built to bypass a construction site or other temporary obstruction. The U.S. Manual on Uniform Traffic Control Devices uses the term "diversion". In Brazil the widest and busiest bypasses are located in the state of São Paulo, and many of them intersect and merge around large cities to form ring-like systems. Most notably the Rodoanel Mário Covas , which encircles

1260-789: Is colloquially named the Cobequid Pass ; this name is for a section of road that bypasses the Wentworth Valley by crossing the Cobequid Mountains . The idea of bypasses predates the use of motor vehicles. The first (northern) London bypass, the present Marylebone Road between Paddington and Islington , was started in 1756. Bypasses can take many years to gain planning approval and funding. Many towns and villages have been campaigning for bypasses for over 30 years e.g. Banwell in North Somerset . There

1323-450: Is demarcated with a dashed yellow line (as opposed to an unbroken yellow line on motorways). The standard speed limit of 100 km/h (62 mph) for national routes usually applies (by default the limit is 80 km/h (50 mph) for non-national roads, even if dual carriageway). Local authorities have the power to apply a limit of up to 120 km/h (75 mph) as used on most motorways (The High Quality Dual Carriageway section of

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1386-577: The Autobahn network programme but still have the blue signs (e. g. the B 59 , formerly A 540 near Grevenbroich ); and on the other hand some former non- Autobahn (yellow) motorways have been added to Autobahn budgeting but the signs have not been changed either (e. g. parts of the B 6 , now A 36 in the north of the Harz highland area in Saxony-Anhalt). Motorways that are neither in

1449-1134: The East Kowloon Corridor , the West Kowloon Corridor , and the Lung Cheung and Ching Cheung Roads . Later ones are named directly as bypasses, such as Kwun Tong Bypass , Hung Hom Bypass , and the Ma On Shan Bypass . Other bypasses include the Tai Po Section of the Tolo Highway , the section within the Tuen Mun New Town of the Tuen Mun Road , the Yuen Long Highway , and the West Kowloon Highway . The Central-Wan Chai Bypass , which costs HK$ 28.1 billion,

1512-500: The Hanlon Parkway and Black Creek Drive have stop-controlled at-grade intersections and private entrances, but have sufficient right-of-way to convert them to full freeways with interchanges if traffic warrants. There are also RIRO expressways , such as Highway 11 and a portion of Highway 35 , which are not full freeways since they allow access to existing properties, but traffic speeds are faster than regular roads due to

1575-708: The Mediterranean world . This influx of road activity necessitated the construction of a dual thoroughfare as the road approached the Porta Portese , the corresponding gate in the Aurelian Walls of Rome for the Via Portuensis . One claim for the first divided highway in the United States was Savery Avenue in Carver, Massachusetts , first built in 1860, where the two roadways were separated by

1638-707: The N1 between the end of the M1 and the border with Northern Ireland and the N25/N22 Ballincollig Bypass in Cork are the only route sections with such special limits). Traffic lights and junctions are permitted at grade on dual carriageways. For older sections of dual carriageway, this has resulted in fewer flyover junctions. Newer dual carriageway sections are usually near motorway standard, with grade-separated junctions, but may not be designated as motorways due to

1701-505: The St. Joseph Valley Parkway ), and Interstate 75 bypassing Tampa and St. Petersburg, Florida . These bypasses usually carry mainline routes rather than auxiliary "bypass" routes. The first bypass route in the United States was completed in 1958 as Alabama State Route 210 (Ross Clark Circle) in Dothan, Alabama . In the United States, the term shoofly – a borrowing from railroad jargon –

1764-680: The autobahn network nor in the Bundesstraße network are given black on white signs, following the same sign code as high-speed dual carriageways—this is mostly seen on urban trunk roads. Italian Highway Code ( Codice della strada ) divides dual carriageways into three different classifications: Italian type-B and type-C roads do not follow a specific numbering criterion. They may be numbered as Strade Statali (SS; "state roads"), Strade Regionali (SR; "regional roads"), Strade Provinciali (SP; "provincial roads") or Strade Comunali (SC; "municipal roads"). The Spanish word for dual carriageway

1827-741: The Box Grove Bypass in the city of Markham ; and in Toronto a section of Highway 401 was called the Toronto Bypass in the 1950s when the highway was built as a bypass of Highway 2 , Ontario Highway 2A which was built to bypass Highway 2 between Toronto and Newcastle , and the Caledonia Bypass, a section of Highway 6 in Caledonia. In Nova Scotia , the section of Highway 104 between Thomson Station and Masstown

1890-475: The Local Government Act 2001. Accordingly, hard shoulders are included wherever feasible to provide for the resulting pedestrian and cyclist traffic, and are present on much of the national route network. These hard shoulders may also be used as running lanes by motorised traffic under certain conditions. Until 2005, many motorways and dual carriageways in Ireland did not have crash barriers in

1953-554: The Soviet Union had 400 km (250 mi). What may have been the world's first long-distance intercity dual carriageway/freeway was the Queen Elizabeth Way in Southern Ontario in Canada, initially linking the large cities of Toronto and Hamilton together by 1939, with construction on this stretch of the present-day Queen Elizabeth Way beginning in 1936 as "Middle Road". It was gradually upgraded to

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2016-659: The UK, although the term "dual carriageway" applies to any road with physically separated lanes, it is frequently used as a descriptive term for major routes built in this style. Such major dual carriageways usually have two lanes of traffic in each direction, with the lane nearest the centre being reserved for overtaking. Occasionally dual carriageways have only one lane in each direction, or more than two lanes each way (sometimes to permit easier overtaking of slower uphill traffic). Different speed limits apply on dual carriageway sections from those that apply on single carriageway sections of

2079-424: The United States, primary routes are designated with a one- or two-digit number , while bypasses and loops are generally designated with a three-digit number beginning with an even digit . However, there are many exceptions to this convention, where routes with three-digit numbers serve the main route through town while the routes with one- or two-digit numbers serve as the bypass. A few such examples can be found in

2142-428: The barrier until it has stopped. Often on urban dual carriageways where the road has been converted from a four-lane single carriageway the central reservation will not be substantial: often just a small steel divider to save space. Turning right (that is, across the line of traffic heading in the opposite direction) is usually permitted only at specific locations. Often the driver will be required to turn left (away from

2205-459: The basis of their structure these roads have, comparable to the German autobahn , the legal foundation that no default speed limit exists (design speed 130 km/h), although the standard advisory speed limit ( German : Richtgeschwindigkeit ) still exists. Nevertheless, expressways are often given speed limit signs. Exit signs. At the moment some (blue) motorways have been taken out of

2268-691: The central reservation, the policy being to use a wider median instead. Crash barriers are now mandatory for such routes, and wire cabling or full crash barriers (depending on whether or not the route is a motorway, and median width) have been fitted to existing routes. Between 2000 and 2010, three major types of dual carriageway were built on national road schemes in Ireland: In Germany the term Autobahnähnliche Straße (motorway-like road) refers to roads that are similar to German autobahn in grade-separation and signage. Most of them are designated as Kraftfahrstraßen (expressways), which means that

2331-502: The city of São Paulo and passes through other cities in the metropolitan area, is the largest project of such type with a planned total length of 180 km upon completion. It is divided into sections and connected to major highways and while not being a toll road itself, accesses to other motorways are often placed through toll booths. Hong Kong contains several bypasses. The first are the Island Eastern Corridor ,

2394-435: The dual carriageway) in order to loop around to an access road that permits crossing the major road. Roundabouts on dual carriageways are relatively common, especially in cities or where the cost of a grade-separated junction would be prohibitive. Where space is even more limited, intersections may be controlled by traffic lights. Smaller residential roads adjoining urban dual carriageways may be blocked off at one end to limit

2457-607: The entire length featured a dual-carriageway design. In the early 1930s, it was extended southward all the way to Naples and northward to Florence. Most of the original routing was destroyed by the Allies in World War II. By 1930 several US and European cities had built dual-carriageway highways, mostly to control traffic jams and/or to provide bypass routes for traffic. In 1932 the first German autobahn opened between Cologne and Bonn. It ran 21 km (13 mi) and became

2520-453: The existing highway becomes heavily congested. Bypasses are common in rural municipalities to deter through traffic from entering the poblacion or town centre. Careful planning is considered when planning a bypass through a community to ensure the original route is downgraded to local access. Control of access to properties is taken in account to avoid uncontrolled land development. Dual carriageway A dual carriageway ( BrE ) or

2583-667: The federally funded Interstate Highway System are fully controlled access divided highways known as freeways . A broader definition, expressways , includes both freeways and partial limited-access divided highways, and "expressway" is often used specifically to refer to the latter. United States Numbered Highways , state highways and other locally maintained highways may also be divided. Speed limits on rural divided highways range from 65 to 75 miles per hour (105 to 121 km/h), with some portions as high as 80 miles per hour (130 km/h). One privately run toll road in Texas, SH 130, has

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2646-611: The first) example of a dual carriageway was the Via Portuensis , built in the first century by the Roman emperor Claudius between Rome and its harbor of Portus . The route between the city and the port experienced a great deal of commercial and pedestrian traffic, as Portus served as the primary avenue for the grain shipments of the Cura Annonae into Rome, as well as transporting the majority of goods imported from across

2709-673: The generic speed limit is 120 km/h (75 mph), minimum speed is 60 km/h (37 mph), driving backwards is strictly prohibited, and they shall not have at-grade junctions. Dual carriageways or expressways in Croatia (Croatian: brza cesta ) are non- tolled roads with 2 or more lanes in each direction, but without emergency lanes . The main motorways in Croatia are also dual carriageways, but they have emergency lanes and tolls. Many bypasses and beltways of smaller cities in Croatia have been recently constructed or planned as dual carriageways. All dual carriageways in Croatia house

2772-544: The hard shoulders. A controlled-access highway (motorway) in Spain is referred to as autopista (literally autotrack ). They may be operated by private companies and be tolled. The two major accesses to Spain from France, AP-7 into Catalonia and AP-8 into the Basque Country , are autopistas. In comparison, the prime road between Spain and Portugal is the photographed autovía A-5 . In both autopistas and autovías,

2835-478: The highest speed limit in the United States at 85 miles per hour (137 km/h). Urban divided highways which are at grade and typically have much lower speed limits are sometimes called boulevards . In keeping with the U.S. Department of Transportation 's Manual on Uniform Traffic Control Devices (MUTCD), since the early 1970s all divided highways are striped by color to show the direction of traffic flow. Two-way undivided roads have an amber center line, with

2898-680: The introduction the Irish Planning system in 1964. Today Irish planning policy prohibits such development on National Primary or National Secondary roads where the speed limit exceeds 60 km/h (37 mph). This policy results from concerns expressed by the National Roads Authority. A local authority is not obliged to implement this policy and can disregard this policy at its own discretion. This would usually only occur in exceptional circumstances or where planners are overruled by elected councillors using section 140 of

2961-708: The lanes of an existing road (for example US Highway 33 between Elkhart and Goshen in northern Indiana). Like other countries, there are several types of divided highways; fully controlled-access divided routes with interchanges (commonly known as "freeways" in the United States, Australia, and regionally within Canada), expressways that often include a mix of interchanges and traffic signals, and divided arterial roads that are almost entirely stop-controlled. Unlike some other countries, divided dual carriageways in Canada are seldom equipped with traffic circles , roundabouts, or rotaries as alternatives to stoplights. In Canada,

3024-535: The median-side baseline is solid amber, and the right sideline is solid white. Frequently in the U.S. the two carriageways are separated by some distance (wide medians with small forests or even hills in them), but drivers can always tell whether the roadway is two-way or one-way—and, if one-way, the direction in which the traffic flows—by looking at the striping coloration. For an example, see inset showing U.S. Route 52 near Lafayette, Indiana . Some divided highways have been turned into undivided highways by widening

3087-458: The metropolitan areas of Des Moines, Iowa ( Interstate 235 goes through downtown, while Interstate 35 and Interstate 80 bypass downtown), Omaha, Nebraska ( Interstate 480 traverses the downtown area , while Interstate 80 is one of the bypasses), and Pittsburgh, Pennsylvania (the city is served by Interstate 279 and Interstate 376 , while Interstate 70 , Interstate 76 , and Interstate 79 all bypass city limits). Another meaning of

3150-678: The need to preserve access to adjoining property or to the absence of a non-motorway alternative route. Also, dual carriageways that are not motorway classified do not need to be equipped with emergency phones. Motorway restrictions only apply to motorway sections, rather than all dual carriageway sections of national roads (these are signposted with the N prefix on the route number, rather than M ). Some national secondary roads , and regional roads in particular often have houses, schools and other developments fronting on to them. Less important national primary roads , and older sections not yet upgraded may also feature such developments built before

3213-522: The number of junctions on the dual carriageway; often other roads will pass over or under the dual carriageway without an intersection. A dual carriageway with grade-separated junctions and which meets other requirements may be upgraded to motorway standard, denoted by an (M) added after the road number (e.g. " A1(M) " or " A38(M) "). Unlike in Ireland, there was no official terminology for 'high-quality dual carriageways' until April 2015, when in England

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3276-414: The old bypass route of U.S. Route 71 to the east of Kansas City, Missouri was decommissioned as Interstate 435 supplanted it; the remainder that existed as suburban surface route became Missouri Route 291 . Around St. Louis, Missouri , what had been U.S. Route 50 Bypass was absorbed into a diversion of U.S. Route 50 from Interstate 44 and Interstate 64 . In the Interstate Highway System in

3339-453: The quality of intersecting junctions. The national speed limit applies on dual carriageways (unless it is in a ' built-up area ', or a lower limit is posted), which is as follows: A dual carriageway in a built up area will have a statutory speed limit of 30 mph (48 km/h) unless otherwise sign-posted. It is common for such urban dual carriageways to have an increased speed limit of 40 mph (64 km/h). A road deemed to be in

3402-508: The roads allow higher speed traffic than is common on other roads. This in turn requires them to have dual carriageways in most cases. An exception is the 2+1 road system in some rural areas; these roads are also referred to as expressways. Autobahnähnliche Straßen mostly are colloquially referred to as gelbe Autobahn (yellow motorway) because they have the same technical standard as the Autobahn but have black on yellow signs instead of

3465-403: The same class of road, except in cities and built-up areas where the dual carriageway is more of a safety measure. When first constructed, many dual carriageways—including the first motorways—had no crash- or other barriers in the central reservation. In the event of congestion, or if a driver missed their exit, some drivers made U-turns onto the opposite carriageway; many accidents were caused as

3528-536: The same name. If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Hampstead_Bypass&oldid=1107665008 " Category : Road disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Bypass (road) If there are no strong land use controls, buildings are often built in town along

3591-646: The term "divided highway" is used for this type of road, and the segment between the roadways is referred to as a "median". There may be gaps in the median strip of a partially controlled-access road to allow turning and crossing. More informally, a divided highway may be referred to as "twinned". This stems from the practice of "twinning" an existing two-lane highway and converting it into a divided highway. Such highways in southern Ontario, southern Quebec, and parts of Atlantic Canada usually feature full controlled-access with interchanges where robust federal and provincial funding has made such freeways possible. However, due to

3654-447: The term bypass route (usually simply called a bypass ) is a highway that was constructed to bypass an area that is often congested with traffic. This includes Interstate Highway beltways and U.S. Highways constructed to circumvent downtown areas. Examples of these are U.S. Route 60 bypassing Williamsburg, Virginia , Interstate 285 bypassing Downtown Atlanta , U.S. Route 20 / U.S. Route 31 bypassing metro South Bend, Indiana (on

3717-600: The town, but the designation was changed to "bypass" in 1959 by AASHTO . However, many "truck" routes remain where the mainline of the highway is prohibited for trucks. In a few cases, both a bypass and a business route exist, each with auxiliary signs (e.g. U.S. Route 60 in Lexington, Kentucky ). Bypass routes are less common than business routes. Many of those that existed before the era of Interstate Highways have lost their old designations. For example, in Missouri ,

3780-414: The white on blue signs used on the Autobahn motorway network. These are generally high-speed arterial roads in larger cities or important roads within a federal state that do not connect to major cities, so that they do not fall under the federal budget for the Autobahn network. The federal road Bundesstraße 27 is an example where about half of its length is upgraded to a high speed motorway standard. On

3843-663: Was chosen in reference to the First Battle of Newbury of 1643 and the Second Battle of Newbury of 1644, both of which took place close to the town during the English Civil War . In the United States , bypass routes are a type of special route used on an alternative routing of a highway around a town when the main route of the highway goes through the town. The original designation of these routes were "truck routes" to divert through truck traffic away from

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3906-642: Was large-scale protest during construction of the Newbury bypass —officially known as the Winchester–Preston Trunk Road (A34) (Newbury Bypass)—a 9-mile (14 km) stretch of dual carriageway which bypasses the town of Newbury in Berkshire , England . The protest was popularly known as the Third Battle of Newbury , a name which was also adopted by one of the main protest groups. The name

3969-528: Was opened running 55 km (34 mi) from Milan to Varese . It featured a broad road bed and did not feature lane dividers except near cities and through the mountains. The London end of the Great West Road became Britain's first dual carriageway when it was opened in 1925 by King George V . In 1927 the Rome bypass was opened. It ran 92 km (57 mi) bypassing Rome to the east. Almost

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