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A semi-trailer truck, is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel.
A disc brake is a type of brake that uses the calipers to squeeze pairs of pads against a disc or a "rotor" to create friction. This action slows the rotation of a shaft, such as a vehicle axle, either to reduce its rotational speed or to hold it stationary. The energy of motion is converted into waste heat which must be dispersed.
A drum brake is a brake that uses friction caused by a set of shoes or pads that press outward against a rotating cylinder-shaped part called a brake drum.
The Armagh rail disaster happened on 12 June 1889 near Armagh, County Armagh, in Ireland, when a crowded Sunday school excursion train had to negotiate a steep incline; the steam locomotive was unable to complete the climb and the train stalled. The train crew decided to divide the train and take forward the front portion, leaving the rear portion on the running line. The rear portion was inadequately braked and ran back down the gradient, colliding with a following train.
Regenerative braking is an energy recovery mechanism that slows down a moving vehicle or object by converting its kinetic energy into a form that can be either used immediately or stored until needed. In this mechanism, the electric traction motor uses the vehicle's momentum to recover energy that would otherwise be lost to the brake discs as heat. This method contrasts with conventional braking systems. In those systems, the excess kinetic energy is converted to unwanted and wasted heat due to friction in the brakes, or with rheostatic brakes, where the energy is recovered by using electric motors as generators but is immediately dissipated as heat in resistors. In addition to improving the overall efficiency of the vehicle, regeneration can significantly extend the life of the braking system as the mechanical parts will not wear out quickly.
Electronic stability control (ESC), also referred to as electronic stability program (ESP) or dynamic stability control (DSC), is a computerized technology that improves a vehicle's stability by detecting and reducing loss of traction (skidding). When ESC detects loss of steering control, it automatically applies the brakes to help steer the vehicle where the driver intends to go. Braking is automatically applied to wheels individually, such as the outer front wheel to counter oversteer, or the inner rear wheel to counter understeer. Some ESC systems also reduce engine power until control is regained. ESC does not improve a vehicle's cornering performance; instead, it helps reduce the chance of the driver losing control of the vehicle.
Driving under the influence (DUI) is the offense of driving, operating, or being in control of a vehicle while impaired by alcohol or drugs, to a level that renders the driver incapable of operating a motor vehicle safely. Multiple other terms are used for the offense in various jurisdictions.
A department of motor vehicles (DMV) is a government agency that administers motor vehicle registration and driver licensing. In countries with federal states such as in North America, these agencies are generally administered by subnational governments, while in unitary states such as many of those in Europe, DMVs are organized nationally by the central government.
A compression release engine brake, compression brake, or decompression brake, frequently called a Jacobs brake or Jake Brake, is an engine braking mechanism installed on some diesel engines. When activated, it opens exhaust valves to the cylinders, right before the compression stroke ends, releasing the compressed gas trapped in the cylinders, and slowing the vehicle.
A truck driver is a person who earns a living as the driver of a truck, which is commonly defined as a large goods vehicle (LGV) or heavy goods vehicle (HGV).
The American Association of Motor Vehicle Administrators (AAMVA) is a non-governmental, voluntary, tax-exempt, nonprofit educational association. AAMVA is a private corporation which strives to develop model programs in motor vehicle administration, police traffic services, and highway safety.
The Michigan State Police (MSP) is the state police agency for the U.S. state of Michigan. The MSP is a full-service law enforcement agency, with its sworn members having full police powers statewide.
A weigh station is a checkpoint along a highway to inspect vehicular weights and safety compliance criteria. Usually, trucks and commercial vehicles are subject to the inspection.
Traffic collision reconstruction is the process of investigating, analyzing, and drawing conclusions about the causes and events during a vehicle collision. Reconstructionists conduct collision analysis and reconstruction to identify the cause of a collision and contributing factors including the role of the driver(s), vehicle(s), roadway and general environment. Physics and engineering principles are the basis for these analyses and may involved the use of software for calculations and simulations. Collision reconstruction is sometimes used as the basis of expert witness testimony at trials. Collision reconstructions are performed in cases involving fatalities or personal injury. Results from collision reconstructions are also sometimes used for making roads and highways safer, as well as improving safety aspects of motor vehicle designs. Reconstructions are typically conducted by forensic engineers, specialized units in law enforcement agencies, or private consultants.
In the United States, driver licenses are issued by each individual state, territory, and the District of Columbia rather than by the federal government due to federalism. Drivers are normally required to obtain a license from their state of residence. All states of the United States and provinces and territories of Canada recognize each other's licenses for non-resident age requirements. There are also licenses for motorcycle use. Generally, a minimum age of 16 is required to apply for a non-commercial driver license, and 18 for commercial licenses which drivers must have to operate vehicles that are too heavy for a non-commercial licensed driver or vehicles with at least 16 passengers or containing hazardous materials that require placards. A state may also suspend an individual's driving privilege within its borders for traffic violations. Many states share a common system of license classes, with some exceptions, e.g. commercial license classes are standardized by federal regulation at 49 CFR 383. Many driving permits and ID cards display small digits next to each data field. This is required by the American Association of Motor Vehicle Administrators' design standard and has been adopted by many US states. According to the United States Department of Transportation, as of 2018, there are approximately 227 million licensed drivers in the United States.
In Canada, driver's licences are issued by the government of the province or territory in which the driver is residing. Thus, specific regulations relating to driver's licences vary province to province, though overall they are quite similar. All provinces have provisions allowing non-residents to use licences issued by other provinces and territories, out-of-country licences, and International Driving Permits. Many provinces also allow non-residents to use regular licences issued by other nations and countries. Canadian driver's licences are also valid in many other countries due to various international agreements and treaties.
On 10 June 1925, a coach crashed at the bottom of a steep hill at Dibbles Bridge, near Hebden in North Yorkshire, England. Seven people were killed and 11 others injured.
British Columbia Commercial Vehicle Safety & Enforcement is a provincial law enforcement agency that is responsible for the compliance and enforcement of the commercial transport sector, protection of the environment and transportation infrastructure of British Columbia, increasing road safety and protecting the motoring public.
The Commercial Vehicle Safety Alliance (CVSA) is a non-profit association of local, state, provincial, territorial and federal commercial motor vehicle safety officials and industry representatives. CVSA focuses on improving driver and vehicle safety by providing guidance to organizations that enforce commercial motor vehicle inspections and certify inspectors, and reports over 4,000 members in the United States, Canada and Mexico.
Vehicle weight is a measurement of wheeled motor vehicles; either an actual measured weight of the vehicle under defined conditions or a gross weight rating for its weight carrying capacity.
References
- ↑ "COMMERCIAL VEHICLE ENFORCEMENT BRANCH" (PDF). Government of Alberta. Archived from the original (PDF) on 2013-04-25. Retrieved 2018-03-26.
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