Pedestrian Safety Guide and Countermeasure Selection System
A speed hump.
Source: Gina Coffman (2012)
Speed humps are paved (usually asphalt) and approximately 3 to 4 in. high at their center, and extend the full width of the street with height tapering near the drain gutter to allow unimpeded bicycle travel. Speed humps should not be confused with the speed “bump” that is often found in mall parking lots. There are several designs for speed humps. The traditional 12-ft hump has a design speed of 15 to 20 mi/h, 14-ft hump a few mph higher, and a 22-ft table has a design speed of 25 to 30 mi/h. The longer humps are much gentler for larger vehicles.
Speed humps can also be designed with two, 1-ft slots to allow for vehicles with wide wheelbases such as buses and emergency vehicles to pass through them without having to go over the measure. These are typically called speed cushions.
Authors and Acknowledgements