Speed Table:

A “speed table” is a term used to describe a very long and broad speed hump, or a flat-topped speed hump, where sometimes a pedestrian crossing is provided in the flat portion of the speed table (see Raised Pedestrian Crossings). 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.



  Purpose
• Reduce vehicle speeds. Raised measures tend to have the most predictable speed reduction impacts.
• Enhance the pedestrian environment at pedestrian crossings.
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  Considerations
• Do not use if on a sharp curve.
• If the street is a bus route or primary emergency route, the design must be coordinated with operators. Usually, some devices are acceptable if used prudently — one device may be appropriate and may serve the primary need (e.g., if there is a particular location along a street that is most in need of slowing traffic and improving pedestrian conditions).
• The aesthetics of speed humps and speed tables can be improved through the use of color and specialized paving materials.
• Noise may increase, particularly if trucks use the route regularly.
• May create drainage problems on some streets.
• Speed humps and tables should be properly designed to reduce the chance of back problems or other physical discomfort experienced by vehicle occupants.
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  Estimated Cost
The cost for each speed hump is approximately $1,000. Speed tables are $2,000 to $15,000, depending on drainage conditions and materials used.
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  Case Studies
Cambridge, MA 
Boulder, CO 
Grand Junction, CO 
Tempe, AZ 
Cambridge, MA 
Bellevue, WA 
Baltimore/Washington International Airport, Maryland 
Tucson, AZ 
Naples, FL 
Sarasota, FL 
New York City, NY 
New York City, NY 
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U.S. Department of Transportation Federal Highway Administration