Traffic
Calming 28. Speed Hump / Table Speed humps are paved (usually asphalt) and approximately 3-4 inches high at their center, and extend the full width of the street. Speed humps should not be confused with a speed "bump" that is often found in mall parking lots. There are several designs for speed humps. The traditional 12-foot hump has a design speed of 15 to 20 mph, a 14-foot one a few mph higher, and a 22-foot table, of 25 to 30 mph. The longer humps are much gentler for larger vehicles. A speed table is a term used to describe a very long and broad speed hump, or for a flat-topped speed hump, where sometimes a pedestrian crossing is provided in the flat portion of the speed table. The speed table can either be parabolic, making it more like a speed hump, or trapezoidal, which is used more frequently in Europe. Speed tables can be used in combination with curb extensions where parking exists.
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Estimated cost The cost for each speed hump is approximately $2,000. Speed tables are $5,000–$15,000, again depending on drainage conditions and materials used. |