NYC Tow Truck Endorsement Practice Exam

Which of the following describes tandem axles?

1. Two rear axles connected with a single drive mechanism

2. Three axles placed together

3. Two rear axles where both have drive mechanisms

4. Two axles where only the front is a driving type and the rear is free-rolling

The correct answer is: Two rear axles where both have drive mechanisms

Tandem axles refer specifically to two axles that are positioned close together on a vehicle. In this context, the correct choice defines tandem axles as two rear axles that both have drive mechanisms. This setup enhances the vehicle's load-carrying capability and overall stability, especially during heavy towing or hauling tasks. The presence of drive mechanisms on both axles increases traction and can improve the vehicle's performance, particularly in challenging road conditions. In practical applications, vehicles equipped with tandem axles are often utilized for towing purposes because they can distribute heavy loads more effectively across multiple wheels. By having both axles engaged in the drive process, it ensures better handling and control. The other options do not accurately capture the definition of tandem axles. For instance, having only one driving axle (as suggested in options that mention a single drive mechanism or a free-rolling axle) does not meet the criteria for tandem axles, which inherently require both axles to contribute to the vehicle’s driving force.