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Question:

What are the regulations on the height of splash guards (mud flaps)?

A It depends on the state.
Explaination

There are currently no federal restrictions governing splash guard height (mud flaps). Each state is free to enact its own regulations, which differ from one state to the next. Consult your state's transportation department for information on its regulations. However, be sure that any mud flaps you have put on your vehicle are secure and in good working order.