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running board
a narrow step fitted under the side doors of a vehicle, typically a truck or SUV, to assist passengers in entering and exiting the vehicle
A running board is a flat, horizontal step attached to the side of a vehicle, typically near the doors. It provides a helpful surface for people to step on when getting in or out of the vehicle, especially in taller trucks and SUVs. Running boards are usually made of metal or plastic and are designed to be sturdy enough to support a persons weight. They can also help protect the vehicles body from dirt and debris. Some running boards have a textured surface to provide extra grip, preventing slipping.
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