How should mud flaps be constructed in terms of material?

Mud flaps should be constructed to be flexible because this flexibility allows them to absorb impacts and adapt to varying road conditions effectively. Flexible materials can better withstand the stresses of road debris and weather changes while maintaining their shape and effectiveness in redirecting mud and water away from the vehicle's body and other drivers.

Using rigid materials would not offer the same level of protection or adaptability, as they could crack or break upon impact. Additionally, the flexibility helps in ensuring that mud flaps can remain functional over time, reducing wear and tear compared to less flexible alternatives. This design consideration is crucial for maintaining vehicle safety and compliance with inspection standards.

Other options suggest rigid materials or a lack of specification on materials, which could potentially compromise performance and effectiveness in practical applications.