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74-604: The DAF XF is a range of semi trucks produced since 1997 by DAF Trucks . The XF 105 won the International Truck of the Year 2007 award. The truck features a 10.8 or 12.9 litre (PACCAR MX 11 or 13) engine and ZF AS Tronic or ZF Traxon gearbox in both manual and automatic formats. Starting with the 2021 generation, the larger cab variants of the XF are named XG and XG+. The Canadian Forces Land Force Command uses

148-402: A king pin , hooked to a horseshoe-shaped quick-release coupling device called a fifth wheel or a turntable hitch at the rear of the towing engine that allows easy hook up and release. The truck trailer cannot move by itself because it only has wheels at the rear end: it requires a forward axle , provided by the towing engine, to carry half the load weight. When braking hard at high speeds,

222-417: A misnomer (the term "eighteen-wheeler" is a nickname for a five-axle over-the-road combination). Many trailers are equipped with movable tandem axles to allow adjusting the weight distribution. To connect the second of a set of doubles to the first trailer, and to support the front half of the second trailer, a converter gear known as a "dolly" is used. This has one or two axles, a fifth-wheel coupling for

296-573: A combination to be 76 t (75 long tons; 84 short tons). At the same time the maximum allowed height would be increased by 20 cm (8 in); from current maximum of 4.2 m (13.8 ft) to 4.4 m (14.4 ft). The effect this major maximum weight increase would cause to the roads and bridges in Finland over time is strongly debated. However, longer and heavier combinations are regularly seen on public roads; special permits are issued for special cargo. The mining company Boliden AB have

370-563: A forward engine, one steering axle, and two drive axles . The fifth-wheel trailer coupling on most tractor trucks is movable fore and aft, to allow adjustment in the weight distribution over its rear axle(s). Ubiquitous in Europe but less common in North America since the 1990s, is the cabover engine configuration, where the driver sits next to or over the engine. With changes in the US to

444-471: A light load is being carried; an arrangement known as a TAG axle when it is the rear axle, or mid-lift when it is the center axle). Some trailers have two axles which have twin tyres on each axle; other trailers have three axles, of which one axle can be a lift axle which has super-single wheels. In the UK, two wheels bolted to the same hub are classed as a single wheel, therefore a standard six-axle articulated truck

518-490: A maximum rigid length of 60 ft (18.2 m), this, combined with a shallow kingpin and fifth wheel set close to the rear of the tractor unit, can give an overall length of around 75 ft (22.75 m). In January 2012, the Department for Transport began conducting a trial of longer semi-trailers. The trial involves 900 semi-trailers of 48 ft (14.6 m) in length (i.e. 3 ft [1 m] longer than

592-402: A permit, and may require one or more pilot vehicles. High-productivity motor vehicle (HPMV) permits are issued for vehicles exceeding 44 tonnes, or the above dimensions. Trucks up to 62 tonnes were allowed, with an initial bridge strengthening program costing $ 12.5m. There are many types of semi-trailers in use, designed to haul a wide range of products. The cargo trailer is, by means of

666-479: A reduction in emissions due to the one tractor unit still being used and no further highway investment being required. Furthermore, Denby Transport asserted that two Eco-Links would replace three standard semi-trailer trucks while, if limited to the current UK weight limit of 97,000 lb (44 t), it was claimed the Eco-Link would reduce carbon emissions by 16% and could still halve the number of trips needed for

740-527: A semi-trailer truck is known as an 'articulated lorry' (or colloquially as an 'artic'). The maximum permitted gross weight of a semi-trailer truck without the use of a Special Type General Order (STGO) is 44,000 kg (97,000 lb). In order for a 44,000 kg semi-trailer truck to be permitted on UK roads the tractor and semi-trailer must have three or more axles each. Lower weight semi-trailer trucks can mean some tractors and trailer having fewer axles. In practice, as with double decker buses and coaches in

814-485: A short combination. They have one stack together with a crane on the 6×4 truck, and two additional stacks on a four axle trailer. The allowed gross weight in both countries is up to 60 t (59 long tons; 66 short tons) depending on the distance between the first and last axle. In the negotiations starting in the late 1980s preceding Sweden and Finland's entries to the European Economic Area and later

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888-470: A similar (on-going) trial in The Netherlands. Similarly, Denmark has allowed 25.25 m combinations on select routes. These vehicles will run a 60-tonne (59.1-long-ton; 66.1-short-ton) weight limit. Two types are to be used: 1) a 26-tonne truck pulling a dolly and semi-trailer, or 2) an articulated tractor unit pulling a B-double , member states gained the ability to adopt the same rules. In Italy

962-740: A single trailer or two trailers (commonly known as "short doubles") with a maximum overall length of 19 m (62 ft) are referred to as "General access heavy vehicles" and are permitted in all areas, including metropolitan. B-doubles are limited to a maximum total weight of 62.5 tonnes and overall length of 25 m (82 ft), or 26 m (85 ft) if they are fitted with approved FUPS (Front Underrun Protection System) devices. B-doubles may only operate on designated roads, which includes most highways and some major metropolitan roads. B-doubles are very common in all parts of Australia including state capitals and on major routes they outnumber single trailer configurations. Maximum width of any vehicle

1036-541: A special permit and escort) is 53.5 m (176 ft), its maximum load may be up to 164 tonnes gross, and may have up to four trailers. However, heavy restrictions apply to the areas where such a vehicle may travel in most states. In remote areas such as the Northern Territory great care must be taken when sharing the road with longer articulated vehicles that often travel during the daytime, especially four-trailer road trains. Articulated trucks towing

1110-460: A standing special permit for 76-tonne (75-long-ton; 84-short-ton) combinations on select routes between mines in the inland and the processing plant in Boliden , taking a 50-tonne (49-long-ton; 55-short-ton) load of ore. Volvo has a special permit for a 32 m (105 ft), steering B-trailer-trailer combination carrying two 12 m (40 ft) containers to and from Gothenburg harbour and

1184-475: A total of nine axles (including steering). In some lighter duty applications, only one of the rear axles of the truck is driven, and the trailer may have only two axles. From July 2007, the Australian Federal and State Governments allowed the introduction of B-triple trucks on a specified network of roads. B-Triples are set up differently from conventional road trains. The front of their first trailer

1258-578: Is 2.5 m (8.2 ft) and a height of 4.3 m (14 ft). In the past few years, allowance has been made by several states to allow certain designs of heavy vehicles up to 4.6 m (15 ft) high but they are also restricted to designated routes. In effect, a 4.6 meter high B-double will have to follow two sets of rules: they may access only those roads that are permitted for B-doubles and for 4.6 meter high vehicles. In Australia, both conventional prime movers and cabovers are common, however, cabovers are most often seen on B-doubles on

1332-518: Is considered to have twelve wheels, even though it has twenty tyres. The UK also allows semi-trailer truck which have six tyres on two axles; these are known as four-wheelers. In 2009, the operator Denby Transport designed and built a 83 ft long (25.25 m) B-Train (or B-Double) semi-trailer truck called the Denby Eco-Link to show the benefits of such a vehicle, which were a reduction in road accidents and result in fewer road deaths,

1406-522: Is now common across Europe as it is able to meet the EU maximum weight limit of 40,000 kg (88,000 pounds) without overloading any axle. Individual countries have raised their own weight limit. The U.K., for example, has a 44,000 kg (97,000 pounds) limit, an increase achieved by adding an extra axle to the tractor, usually in the form of a middle unpowered lifting axle (midlift) with a total of 14 wheels. The lift axles used on both tractors and trailers allow

1480-532: Is operated by transport company Ketosen Kuljetus as part of a pilot project studying transport efficiency in the timber industry. The combined vehicle is 33 metres (108 ft) long, has 13 axles, and weighs a total of 104 tonnes (102 long tons; 115 short tons). Starting from 21 January 2019 the Government of Finland changed the maximum allowed length of truck from 25.25 to 34.50 meters (82.8 to 113.2 ft). New types of vehicle combinations that differ from

1554-429: Is reflected in the most popular configurations of trucks generally having dual drive axles and three axles on the trailers, with four tyres on each axle. This means that Australian single semi-trailer trucks will usually have 22 tyres, which is generally more than their counterparts in other countries. Super single tyres are sometimes used on tri-axle trailers. The suspension is designed with travel limiting, which will hold

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1628-421: Is supplied. This is a fail-safe design feature which ensures that if air pressure to either unit is lost, the vehicle will stop to a grinding halt, instead of continuing without brakes and becoming uncontrollable. The trailer controls are coupled to the tractor through two gladhand connectors , which provide air pressure, and an electrical cable, which provides power to the lights and any specialized features of

1702-408: Is supported by the turntable on the prime mover. The second and third trailers are supported by turntables on the trailers in front of them. As a result, B-Triples are much more stable than road trains and handle exceptionally well. True road trains only operate in remote areas, regulated by each state or territory government. In total, the maximum length that any articulated vehicle may be (without

1776-630: The Department for Transport to undertake a desk study into semi-trailer trucks, which has resulted in the longer semi-trailer trial which commenced in 2012. In North America , the combination vehicles made up of a powered semi-tractor and one or more semitrailers are known as "semis", "semitrailers", "tractor-trailers", "big rigs", "semi-trucks", "eighteen-wheelers", or "semi-tractor-trailers". The tractor unit typically has two or three axles ; those built for hauling heavy-duty commercial-construction machinery may have as many as five, some often being lift axles . The most common tractor-cab layout has

1850-544: The European route E4 between the timber terminal in Överkalix and the sawmill in Munksund (outside Piteå ). The vehicle is a 30 m (98 ft) long truck trailer combination with a gross weight exceeding 90 tonnes (89 long tons; 99 short tons). It is estimated that this will give a 20% lower cost and 20–25% CO 2 emissions reduction compared to the regular 60-tonne (59-long-ton; 66-short-ton) truck combinations. As

1924-484: The United Kingdom section , below. When using a dolly , which generally has to be equipped with lights and a license plate , rigid trucks can be used to pull semi-trailers. The dolly is equipped with a fifth wheel to which the trailer is coupled. Because the dolly attaches to a pintle hitch on the truck, maneuvering a trailer hooked to a dolly is different from maneuvering a fifth wheel trailer. Backing

1998-531: The Volvo Trucks factory, all on the island of Hisingen . Another example is the ongoing project En Trave Till (lit. One more pile/stack ) started in December 2008. It will allow even longer vehicles to further rationalize the logging transports. As the name of the project points out, it will be able to carry four stacks of timber, instead of the usual three. The test is limited to Norrbotten county and

2072-626: The B-link and a 12 m (40 ft) container (or two 6 m containers) on a semi-trailer bed. In allowing the longer truck combinations, what would take two 16.5 m (54 ft) semi-trailer trucks and one 18.75 m (62 ft) truck and trailer to haul on the continent now could be handled by just two 25.25 m trucks – greatly reducing overall costs and emissions. Prepared since late 2012 and effective in January 2013, Finland has changed its regulations to allow total maximum legal weight of

2146-519: The Denby vehicle had a 20% shorter stopping distance than conventional semi-trailer trucks of the same weight, due to having extra axles. The active steer system meant that the Eco-Link had a turning circle of 41 ft (12.5 m), the same as a conventional semi-trailer truck. Although the Department for Transport advised that the Eco-Link was not permissible on public roads, Denby Transport gave

2220-532: The EU document; however, apart from Sweden and Finland, the EuroCombi is only allowed to operate on specific roads in other EU member states. Since 1996 Sweden and Finland formally won a final exemption from the European Economic Area rules with 60 tonne and 25.25-metre (83 ft) combinations. From 2006, 25.25 m truck trailer combinations are to be allowed on restricted routes within Germany, following

2294-508: The European Economic Area. With the 50% increase in cargo weight, the fuel efficiency increases an average of 20% with a corresponding relative decrease in carbon emissions and with the added benefit of one third fewer trucks on the road. The 1996 EU regulation defines a Europe Module System (EMS) as it was implemented in Sweden. The wording of EMS combinations and EuroCombi are now used interchangeably to point to truck combinations as specified in

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2368-569: The European Union, they insisted on exemptions from the EU rules citing environmental concerns and the transportation needs of the logging industry. In 1995, after their entry to the union, the rules changed again, this time to allow trucks carrying a standard CEN unit of 7.82 m (26 ft) to draw a 13.6 m (45 ft) standard semi-trailer on a dolly, a total overall length of 25.25 m. Later, B-double combinations came into use, often with one 6 m (20 ft) container on

2442-487: The Interstates. Except for these units, double setups are not restricted to certain roads any more than a single setup. They are also not restricted by weather conditions or "difficulty of operation". The Canadian province of Ontario, however, does have weather-related operating restrictions for larger tandem trailer setups. Australian road transport has a reputation for using very large trucks and road trains . This

2516-599: The Police prior warning of the timing and route of the test drive on the public highway, as well as outlining their position in writing to the Eastern Traffic Area Office. On 1 December 2009 Denby Transport were preparing to drive the Eco-Link on public roads, but this was cut short because the Police pulled the semi-trailer truck over as it left the gates in order to test it for its legality "to investigate any... offenses which may be found". The Police said

2590-667: The Spruce Production Division to build roads into western Washington to harvest the dispersed stands of the best trees. After the war ended, a plenitude of surplus military trucks made their adoption attractive to logging companies, particularly smaller outfits that could not afford expensive locomotives. The primitive trucks were improved in the 1920s and 1930s, with more powerful engines and better braking systems. The old "narrow, solid rubber—sometimes steel—treadless tires" were replaced by wider pneumatic ones with treads. Plank roads gave way to graded dirt ones. By

2664-464: The UK is now predominantly carried out by private companies, but extremely large or heavy loads that require road closures must still be escorted by the police. In the UK, some semi-trailer trucks have eight tyres on three axles on the tractor; these are known as six-wheelers or "six leggers," with either the centre or rear axle having single wheels which normally steer as well as the front axle and can be raised when not needed (i.e. when unloaded or only

2738-477: The UK). European trucks, whether straight trucks or fully articulated , have a sheer face on the front. This allows shorter trucks with longer trailers (with larger freight capacity) within the legal maximum total length. Furthermore, it offers greater maneuverability in confined areas, a more balanced weight-distribution, and better overall view for the driver. The major disadvantage is that for repairs on COE trucks,

2812-607: The UK, male/female quick release connectors ( red line or emergency), have a female on the truck and male on the trailer, but a yellow line or service has a male on the truck and female on the trailer. This avoids coupling errors (causing no brakes) plus the connections will not come apart if pulled by accident. The three electrical lines will fit one way around a primary black, a secondary green, and an ABS lead, all of which are collectively known as suzies or suzie coils . Timber truck The most convenient trees to cut down were those near waterways for easy transportation. As

2886-468: The UK, there is no legal height limit for semi-trailer trucks; however, bridges over 16.5 ft (5.03 m) do not have the height marked on them. Semi-trailer trucks in continental Europe have a height limit of 13.1 ft (4.0 m). Vehicles heavier than 44,000 kg are permitted on UK roads but are indivisible loads, which would be classed as abnormal (or oversize). Such vehicles are required to display an STGO (Special Types General Order) plate on

2960-529: The XF95 Tropco Tractor for their tank transport platform leased from the Dutch Army . This truck-related article is a stub . You can help Misplaced Pages by expanding it . Semi truck A semi-trailer truck (also known by a wide variety of other terms - see below ) is the combination of a tractor unit and one or more semi-trailers to carry freight . A semi-trailer attaches to

3034-577: The amount of freight carried by road, and to improve the range of vehicles and trailers available to transport operators. Common combinations in New Zealand are a standard semi-trailer, a B-double , or a rigid towing vehicle pulling a trailer with a drawbar, with a maximum of nine axles. Standard maximum vehicle lengths for trailers with one axle set are: Trailers with two axle sets can be 20 m (66 ft) long, including heavy rigid vehicles towing two trailers. Oversized loads require, at minimum,

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3108-506: The combination is legal in that state. Weight maximums are 20,000 lb (9,100 kg) on a single axle, 34,000 lb (15,000 kg) on a tandem, and 80,000 lb (36,000 kg) total for any vehicle or combination. There is a maximum width of 8.5 ft (2.6 m) and no maximum height. Roads other than Interstates are regulated by individual states, and laws vary widely. Maximum weight varies between 80,000 lb (36,000 kg) to 171,000 lb (78,000 kg), depending on

3182-470: The combination spreads its weight over more axles, braking distance, road wear and traffic safety is believed to be either the same or improved with the 90-tonne (89-long-ton; 99-short-ton) truck-trailer. In the same program two types of 76-tonne (75-long-ton; 84-short-ton) combinations will be tested in Dalsland and Bohuslän counties in western Sweden: an enhanced truck and trailer combination for use in

3256-457: The combination. Most states restrict operation of larger tandem trailer setups such as triple units, turnpike doubles, and Rocky Mountain doubles. Reasons for limiting the legal trailer configurations include safety concerns and the impracticality of designing and constructing roads that can accommodate the larger wheelbase of these vehicles and the larger minimum turning radii associated with them. In general, these configurations are restricted to

3330-464: The current maximum), and a further 900 semi-trailers of 51 ft (15.65 m) in length (i.e. 7 ft [2.05 m] longer). This will result in the total maximum length of the semi-trailer truck being 57 ft (17.5 m) for trailers 48 ft in length, and 61 ft (18.55 m) for trailers 51 ft long. The increase in length will not result in the 97,000 lb weight limit being exceeded and will allow some operators to approach

3404-399: The current standards may also be used on the road. The requirements for combinations also include camera systems for side visibility, an advanced emergency braking and lane detector system, electronic driving stability system and electronically controlled brakes. Maximum length of a vehicle combination 34.5 metres Maximum length of a vehicle combination 34.5 metres In the United Kingdom ,

3478-551: The definition of a "towing implement", with Denby prepared to argue that the second trailer on the Eco-Link was one. The Department for Transport were of the opinion that this refers to recovering a vehicle after an accident or breakdown, but the regulation does not explicitly state this. During BTAC performance testing the Eco-Link was given an "excellent" rating for its performance in maneuverability, productivity, safety and emissions tests, exceeding ordinary semi-trailer trucks in many respects. Reportedly, private trials had also shown

3552-519: The eastern seaboard where the reduction in total length allows the vehicle to pull longer trailers and thus more cargo than it would otherwise. New Zealand legislation governing truck dimensions falls under the Vehicle Dimensions and Mass Rules, published by NZ Transport Agency . New rules were introduced effective 1 February 2017, which increased the maximum height, width and weight of loads and vehicles, to simplify regulations, increase

3626-420: The entire cab has to hinge forward to allow maintenance access. In Europe, usually only the driven tractor axle has dual wheels, while single wheels are used for every other axle on the tractor and the trailer. The most common combination used in Europe is a semi tractor with two axles and a cargo trailer with three axles, one of which is sometimes a lift axle , giving 5 axles and 12 wheels in total. This format

3700-529: The forest and a b-double for plain highway transportation to the mill in Skoghall . In 2012, the Northland Mining company received permission for 90-tonne (89-long-ton; 99-short-ton) combinations with normal axle load (an extra dolly) for use on the 150 km (93 mi) Kaunisvaara - Svappavaara route, carrying iron ore. As of 2015 , the longest and heaviest truck in everyday use in Finland

3774-479: The front of the tractor unit and, under certain circumstances, are required to travel by an authorized route and have an escort. Most UK trailers are 45 ft (13.7 m) long and, dependent on the position of the fifth wheel and kingpin , a coupled tractor unit and trailer will have a combined length of between 50 and 55 ft (15.25 and 16.75 m). Although the Construction and Use Regulations allow

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3848-583: The ground can be mounted on the rear of the truck behind the load, allowing a short (lightweight) crane to reach both ends of the vehicle without uncoupling. Also, construction trucks are more often seen in a rigid + midaxle trailer configuration instead of the tractor/semi-trailer setup. The maximum overall length in the EU and EEA member states was 18.75 m (61.5 ft) with a maximum weight of 40 or 44 tonnes (39.4 or 43.3 long tons; 44.1 or 48.5 short tons) if carrying an ISO container . However, rules limiting

3922-909: The maximum length of the combined vehicle, the cabover was largely phased out of North American over-the-road (long-haul) service by 2007. Cabovers were difficult to service; for a long time, the cab could not be lifted on its hinges to a full 90-degree forward tilt, severely limiting access to the front of the engine. As of 25 May 2016 , a truck could cost US$ 100,000 , while the diesel fuel cost could be $ 70,000 per year. Trucks average from 4 to 8 miles per US gallon (59 to 29 L/100 km), with fuel economy standards requiring better than 7 miles per US gallon (34 L/100 km) efficiency by 2014. Power requirements in standard conditions are 170 hp (130 kW) at 55 mph (89 km/h) or 280 hp (210 kW) at 70 mph (113 km/h), and somewhat different power usage in other conditions. The cargo trailer usually has tandem axles at

3996-444: The maximum length was unlimited; the only limitations were on axle load. What stopped Sweden from adopting the same rules as the rest of Europe, when securing road safety, was the national importance of a competitive forestry industry. Finland, with the same road safety issues and equally important forestry industry, followed suit. The change made trucks able to carry three stacks of cut-to-length logs instead of two, as it would be in

4070-444: The maximum permitted weight (unless exceptional transport is authorized) is 44 tonnes for any kind of combination with five axles or more. Czech Republic has allowed 25.25 m combinations with a permission for a selected route. Denmark and Norway allow 25.25 m (83 ft) trucks (Denmark from 2008, and Norway from 2008 on selected routes). In Sweden , the allowed length has been 24 m (79 ft) since 1967. Before that,

4144-542: The mid-1930s, trucks were hauling as much timber out of the Pacific Northwest as the railroads. World War II saw improved truck designs, and once again these were passed along to logging companies through the sale of surplus military vehicles after the war was over. There are two main types of modern logging trucks—those used on rough ground and trails in the forest where they are felled and those used for transport on normal highways and roads. Because

4218-406: The quality of the surface - mud and snow are harder to climb than gravel and soil. For a manageable gradient, the speed will then depend upon the power of the truck. The legal weight limits will vary by jurisdiction but, for example, in the southern states of the US, they range from 80,000 to 88,000 pounds (36,300 to 39,900 kg)—about 40 short tons (35.7 long tons; 36.3 t). To load

4292-595: The rear trailer, and a tongue with a ring-hitch coupling for the forward trailer. Individual states may further allow longer vehicles, known as "longer combination vehicles" (or LCVs ), and may allow them to operate on roads other than Interstates. Long combination vehicle types include: The US federal government, which only regulates the Interstate Highway System , does not set maximum length requirements (except on auto and boat transporters), only minimums. Tractors can pull two or three trailers if

4366-435: The rear, each of which has dual wheels , or eight tires on the trailer, four per axle. In the US it is common to refer to the number of wheel hubs, rather than the number of tires; an axle can have either single or dual tires with no legal difference. The combination of eight tires on the trailer and ten tires on the tractor is what led to the moniker eighteen wheeler , although this term is considered by some truckers to be

4440-479: The rim off the road for one blown or deflated tyre for each side of the trailer, so a trailer can be driven at reduced speed to a safe place for repair. Super singles are also often used on the steer axle in Australia to allow greater loading over the steer axle. The increase in loading of steer tyres requires a permit. Long haul transport usually operates as B-doubles with two trailers (each with three axles), for

4514-525: The road compared to the standard six-axle 97,000 lb (44 t) semi-trailer truck. The vehicle was built after Denby Transport believed they had found a legal-loophole in the present UK law to allow the Eco-Link to be used on the public roads. The relevant legislation concerned the 1986 Road Vehicles Construction and Use Regulations. The 1986 regulations state that "certain vehicles" may be permitted to draw more than one trailer and can be up to 85 ft (25.9 m). The point of law reportedly hinged on

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4588-438: The roads in forests are rough and often temporary, the suspension and tires of an offroad truck are especially significant. Solid, low pressure and high pressure tires have been used. As many as nine axles may be used to provide low ground pressure and good traction. Timber is commonly grown in hilly country unsuitable for farming and so the ability of a log truck to climb a gradient is significant. The steepness depends on

4662-428: The same amount of cargo carried in conventional semi-trailer trucks. This is based on the fact that for light but bulky goods such as toilet paper, plastic bottles, cereals and aluminum cans, conventional semi-trailer trucks run out of cargo space before they reach the weight limit. At 97,000 lb (44 t), as opposed to 132,000 lb usually associated with B-Trains, the Eco-Link also exerts less weight per axle on

4736-446: The semi-trailers to 16.5 m (54 ft) and 18.75 m are met with trucks carrying a standardized 7.82 m (26 ft) body with one additional 7.82 m body on tow as a trailer. 25.25-metre (83 ft) truck combinations were developed under the branding of EcoCombi which influenced the name of EuroCombi for an ongoing standardization effort where such truck combinations shall be legal to operate in all jurisdictions of

4810-685: The supply dwindled and loggers had to go farther from water, they used teams of oxen or horses for hauling. These were superseded by steam-powered donkeys and locomotives . The final development was the logging truck. A truck was used for logging in Covington, Washington , in 1913. The coming of World War I and the resulting demand for the Pacific Northwest 's Sitka spruce for airplanes "established log trucking in Washington ". The United States Army assigned thousands of men to

4884-434: The tractor and trailer are separated without first uncoupling the air lines. These connectors are similar in design to the ones used for a similar purpose between railroad cars . Two air lines typically connect to the trailer unit. An emergency or main air supply line pressurizes the trailer's air tank and disengages the emergency brake, and a second service line controls the brake application during normal operation. In

4958-403: The tractor unit. The most common failure is brake fade , usually caused when the drums or discs and the linings of the brakes overheat from excessive use. The parking brake of the tractor unit and the emergency brake of the trailer are spring brakes that require air pressure in order to be released. They are applied when air pressure is released from the system, and disengaged when air pressure

5032-544: The tractor with a type of hitch called a fifth wheel . There are a wide variety of English-language terms for a semi-trailer truck, including: US English : British English Canadian English The main difference between tractor units in Europe and North America is that European models are cab over engine (COE, called "forward control" in the United Kingdom ), while the majority of North American trucks are "conventional" (called "normal control" or "bonneted" in

5106-433: The trailer. Glad-hand connectors (also known as palm couplings ) are air hose connectors, each of which has a flat engaging face and retaining tabs. The faces are placed together, and the units are rotated so that the tabs engage each other to hold the connectors together. This arrangement provides a secure connection but allows the couplers to break away without damaging the equipment if they are pulled, as may happen when

5180-539: The trucks to remain legal when fully loaded (as weight per axle remains within the legal limits); on the other hand, these axle set(s) can be raised off the roadway for increased maneuverability or for reduced fuel consumption and tire wear when carrying lighter loads. Although lift axles usually operate automatically, they can be lowered manually even while carrying light loads, in order to remain within legal (safe) limits when, for example, navigating back-road bridges with severely restricted axle loads. For greater detail, see

5254-481: The vehicle has a tendency to fold at the pivot point between the towing vehicle and the trailer. Such a truck accident is called a "trailer swing", although it is also commonly described as a "jackknife." Jackknifing is a condition where the tractive unit swings round against the trailer, and not vice versa. Semi trucks use air pressure, rather than hydraulic fluid, to actuate the brake . The use of air hoses allows for ease of coupling and uncoupling of trailers from

5328-402: The vehicle requires the same technique as backing an ordinary truck/full trailer combination, though the dolly/semi setup is probably longer, thus requiring more space for maneuvering. The tractor/semi-trailer configuration is rarely used on timber trucks since they use the two major advantages of having the weight of the load on the drive wheels, and the loader crane used to lift the logs from

5402-496: The vehicle was unlawful due to its length and Denby Transport was served with a notice by the Vehicle and Operator Services Agency (VOSA) inspector to remove the vehicle from the road for inspection. Having returned to the yard, Denby Transport was formally notified by Police and VOSA that the semi-trailer truck could not be used. Neither the Eco-Link, nor any other B-Train, have since been permitted on UK roads. However, this prompted

5476-455: The weight limit which may not have been previously possible due to the previous length of trailers. The trial will run for a maximum of 10 years. Providing certain requirements are fulfilled, a Special Types General Order (STGO) allows for vehicles of any size or weight to travel on UK roads. However, in practice, any such vehicle has to travel by a route authorized by the Department of Transport and move under escort. The escort of abnormal loads in

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