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Speed Humps/Tables <br />Vertical Elements <br />Purpose <br />A physical feature (usually made of <br />asphalt or rubber mounds) that are <br />designed to rise above the roadway <br />surface and extend across the <br />roadway perpendicular to the traffic <br />flow. Typically used to reduce <br />vehicle speeds. <br />Speed Table <br />Speed Bump <br />Source: Institute of Transportation Engineers <br />Traffic Calming: State of Practice <br />Effects <br />Volumes <br />May reduce traffic volumes. <br />Speed <br />Effective in slowing vehicles traveling at typical residential speeds to <br />approximately 5 to15 mph depending on type installed at the device – may <br />reduce overall speeds by 5 to 7 mph. <br />Traffic Noise and Air <br />May have an increase of noise at the bumps/humps. <br />Traffic Safety <br />Traffic safety has not been found to be compromised with these devices. <br />Traffic safety benefits can be gained if speeding is involved. <br />Advantages <br />• Reduces speeds. <br />• Usually reduces traffic volumes. <br />• Does not require parking removal or interfere with bicycle/pedestrian <br />traffic. <br />Disadvantages <br />• Can potentially increase noise. <br />• Can cause traffic to shift to parallel residential or collector streets. <br />• May decrease emergency vehicles response times. <br />Problems Targeted <br />• Excessive speed. <br />• High volumes. <br />Design <br />• Speed humps are only effective for 250 feet on either side of the hump. <br />Thus, a neighborhood considering speed hump installation would require <br />two to three installations. <br /> <br />