Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Washboarding is the name of the process which results in unmetalled (unpaved) roads developing a series of regular bumps with short spacing in the road surface. The result is called a washboard road. They are also known as corrugated roads.Washboarding is an instability that occurs when vehicles move above a critical speed, that depends on the properties of the vehicles and the road surface. If all the vehicles move below their critical speed the road will remain flat, but if they move faster, ripples will slowly grow and move in the direction of the vehicles. It has been argued that the vehicle's suspension is important, but this can not explain why washboard road forms when vehicles' suspensions vary so much.

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