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2. Wheel clamp - Wikipedia

   en.wikipedia.org/wiki/Wheel_clamp

   A wheel clamp, also known as wheel boot, parking boot, or Denver boot, [1] [2] is a device that is designed to prevent motor vehicles from being moved. In its most common form, it consists of a clamp that surrounds a vehicle wheel, designed to prevent removal of both itself and the wheel.

3. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   The semi-trailer increased the capacity of trucks, but it was the fifth wheel that brought the flexibility for drivers to keep moving while receivers unloaded the loads they just delivered. The Fruehauf Trailer Corporation helped to make the Martin Rocking 5th Wheel a success by installing them on their popular new semi-trailer design. August ...

4. Locking hubs - Wikipedia

   en.wikipedia.org/wiki/Locking_hubs

   Locking hubs, also known as free wheeling hubs are fitted to some (mainly older) four-wheel drive vehicles, allowing the front wheels to rotate freely when disconnected (unlocked) from the front axle. This is done to reduce the mechanical resistance of the front-portion of the drivetrain when four-wheel drive is not in use. [1]

5. Locking differential - Wikipedia

   en.wikipedia.org/wiki/Locking_differential

   Sensors monitor wheel speeds, and if one is rotating more than a specified number of revolutions per minute (e.g. 100) than the other (i.e. slipping) the traction control system momentarily brakes it. This transfers more power to the other wheel, [6] but still employs the open differential, which is the same as on cars without the EDL option ...

6. Wheel chock - Wikipedia

   en.wikipedia.org/wiki/Wheel_chock

   The mining industry uses wheel chocks to protect lubrication trucks and heavy maintenance vehicles from slipping on off-road terrain when placed in Park. The huge haul trucks, which can weigh up to 450 tonnes (440 long tons; 500 short tons), require a much larger wheel chock that itself will weigh almost 40 kilograms (88 pounds).

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   mail.aol.com

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