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  2. Wheel alignment - Wikipedia

    en.wikipedia.org/wiki/Wheel_alignment

    Wheel alignment, which is sometimes referred to as breaking or tracking, is part of standard automobile maintenance that consists of adjusting the angles of wheels to the car manufacturer specifications. [1] The purpose of these adjustments is to reduce tire wear and to ensure that vehicle travel is straight and true (without "pulling" to one ...

  3. Grouser - Wikipedia

    en.wikipedia.org/wiki/Grouser

    Protrusions molded into rubber tractor tire treads are known as lugs, as are cleats for round wheels, [citation needed] which perform a similar function. Unlike metal grousers, these rubber tire treads or crawler-track shoes/pads may be more suitable for driving on roads. [7]

  4. Truck apron - Wikipedia

    en.wikipedia.org/wiki/Truck_apron

    Truck aprons are between the road portion of the roundabout and the inner circle of the roundabout. [2] On slip lanes, the truck apron is located between the road surface (bitumen) and the sidewalk. Both in roundabouts and slip lanes the truck apron is raised slightly, in an attempt to keep light vehicles on the main road surface.

  5. Semi-trailer aerodynamic device - Wikipedia

    en.wikipedia.org/wiki/Semi-trailer_aerodynamic...

    Semi-trailer aerodynamic devices are devices affixed to semi-trailers, for the purpose of reducing aerodynamic drag caused by air turbulence.The two major types of device in use are trailer skirts (or side skirts), affixed to the underside of trailers, and trailer tails (or boat tails, or rear fairings), affixed to the rear.

  6. Glossary of rail transport terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_rail_transport...

    A small cast iron post or holder, for the attachment of a wheel cover. Wheel cover edge A heading or molding formed on the outer edge of a wheel cover. Wheel fit That part of a driving or truck wheel that is forced on an axle or crank pin. Wheel flange. Also Adhesion railway. The inner section of a wheel that rides between the two rails.

  7. Trailer (vehicle) - Wikipedia

    en.wikipedia.org/wiki/Trailer_(vehicle)

    A fifth-wheel coupling is also referred to as a kingpin hitch and is a smaller version of the semi-trailer "fifth wheel". Though a fifth wheel and a gooseneck trailer look much the same, their method for coupling is different. A fifth wheel uses a large horseshoe-shaped coupling device mounted 1 foot (0.30 m) or more above the bed of the tow ...