NYC Tow Truck Endorsement Practice Exam

What is the purpose of a tag axle in a truck chassis?

1. To enhance the driving power of the front axle

2. To increase the towing capacity of the vehicle

3. To extend the wheelbase of the vehicle

4. To provide redundancy in case of axle failure

The correct answer is: To extend the wheelbase of the vehicle

The purpose of a tag axle in a truck chassis is primarily to extend the wheelbase of the vehicle. By adding an additional axle, typically located behind the drive axles, the tag axle improves load distribution and stability of the truck. This extended wheelbase can enhance the vehicle's handling characteristics and may also allow for carrying heavier loads while maintaining compliance with weight regulations. A longer wheelbase can contribute to better towing dynamics and improve the vehicle's ability to navigate turns with greater stability. Additionally, the tag axle helps to distribute the weight of the cargo more evenly across the axles, leading to less wear and tear on the tires and other components, thus promoting longer operational efficiency. While increasing towing capacity, enhancing drive power at the front axle, and providing redundancy in case of axle failure are pertinent considerations in vehicle design, these are not the primary roles of a tag axle specifically. The main function remains focused on wheelbase extension and load management.