NYC Tow Truck Endorsement Practice Exam

Which type of axle configuration involves having two axles, one being the driving type and the other a free-rolling unit?

1. Trailing axle tandem

2. Pusher tandem

3. Dual drive tandem

4. Tag axle configuration

The correct answer is: Trailing axle tandem

The correct answer describes a configuration where there are two axles, one of which is the driving axle while the other is a free-rolling axle. In the trailing axle tandem setup, the driving axle is positioned in the front, providing the necessary propulsion. This allows for efficient weight distribution and better traction, particularly when navigating slopes or uneven terrains. The other configurations involve different arrangements or functions of the axles. A pusher tandem has both axles typically driving, enhancing load capacity and traction. The dual drive tandem refers to both axles being powered, which is common in vehicles that require greater power for heavy loads. The tag axle configuration, usually a third axle, serves to support heavy loads but does not drive the vehicle, thereby functioning differently than a trailing axle tandem. Understanding these distinctions is crucial for recognizing the practical applications of each axle type in towing.