A speed bump is a raised section of road surface designed to slow down vehicles in areas where low speeds are desired — such as parking lots, residential streets, schools, and pedestrian zones.
It is usually made from rubber, plastic, asphalt, or concrete, and is typically 2 to 4 inches (5–10 cm) high and 1 to 3 feet (30–90 cm) wide.
Purpose:
To reduce vehicle speed for safety.
To protect pedestrians and other road users.
To control traffic flow in sensitive area