What is the Washington state mud flap requirement?

In Washington state, the mud flap requirement mandates that commercial vehicles with a gross weight of 10,000 pounds or more must have mud flaps installed behind the rear wheels. These flaps must be made of durable materials and extend to within 8 inches of the ground to effectively reduce the spray of water and debris from the tires. This regulation aims to enhance road safety by minimizing the risk of visibility issues and road hazards for other drivers. Compliance is enforced by law enforcement, and failure to adhere can result in fines.