Michigan Commercial Driver's License (CDL) Practice Exam

What is the minimum allowable height for mud flaps on a vehicle?

1. Within 6 inches of the surface of the road

2. Within 10 inches of the surface of the road

3. Within 12 inches of the surface of the road

4. Within 8 inches of the surface of the road

The correct answer is: Within 8 inches of the surface of the road

The minimum allowable height for mud flaps on a vehicle is defined to ensure they effectively minimize the spray of water, mud, and debris kicked up by the vehicle's tires. When they are positioned too high, they become less effective in performing their primary function of protecting other vehicles and pedestrians from road debris. Setting the maximum height at within 8 inches from the surface of the road strikes a balance between practicality and effectiveness. This height ensures that the mud flaps can effectively capture and deflect the debris that would otherwise be released into the air. Adhering to this regulation is essential for maintaining safety on the roads, particularly in adverse weather conditions where the risk of reduced visibility and road hazards increases. In conclusion, the specific requirement of keeping mud flaps within 8 inches of the ground level is crucial in fulfilling their intended purpose, thus promoting safer driving conditions for all road users.