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In the 1930s, Walker invented a device which added a fifth wheel to cars to aid parallel parking. The extra wheel was mounted on the rear of the vehicle, at right angles to the rest of the wheels. When in use, the fifth wheel lifted the back of the car off its normal rear wheels, allowing the rear of the car to swing laterally. [2] [3]
A wheel would be placed on the rear frame section of the truck, which at the time had only four wheels, making the additional wheel the "fifth wheel". The trailer needed to be raised so that the trailer's pin would be able to drop into the central hole of the fifth wheel.
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] Grousers on a captured World War I British tank.
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