How much of the tire should be covered by the mud flap?

The correct answer emphasizes that the mud flap should cover at least half the tire to effectively prevent debris, water, and other materials from being thrown up by the tires while the vehicle is in motion. This is essential for several reasons, including safety and compliance with regulations. Adequate coverage reduces the risk of hitting other vehicles or pedestrians with projectiles that can cause injury or damage. Furthermore, proper mud flap coverage helps maintain the vehicle's overall cleanliness and reduces the potential for corrosion caused by road debris and moisture hitting vulnerable areas of the vehicle.

In contrast, less coverage, such as covering less than a quarter of the tire or only three-quarters of the tire, may not provide sufficient protection. These options do not meet the safety standards necessary for effective operation, as they could allow for more debris to escape from the tire area. No coverage at all would not fulfill the safety requirements and could lead to significant hazards on the road. Therefore, having at least half of the tire covered by the mud flap establishes a proper balance between safety, regulatory compliance, and effective vehicle maintenance.