CDL Vehicle Combination Practice Test

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What is the purpose of a tandem axle?

To increase traction on wet roads

To distribute weight more evenly and provide better stability

The purpose of a tandem axle is to distribute weight more evenly across the vehicle and provide better stability. In vehicle design, tandem axles consist of two axles placed closely together on the same vehicle, which allows for a larger area of contact with the ground. This configuration helps to spread the weight of the load more evenly, which can prevent excessive wear on any single axle and improves the overall handling of the vehicle, especially when carrying heavy loads.

By enhancing stability, tandem axles also help prevent the vehicle from tipping over, particularly during turns or when driving on uneven surfaces. This increased stability is crucial for safety, especially for heavy combination vehicles like trucks and trailers. The additional load distribution capability provided by tandem axles can also enhance traction, but that is a secondary benefit rather than a primary purpose.

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To extend the lifespan of tires

To allow for tighter turning radius

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