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Effects <br />Volumes <br />Speed <br />Traffic Noise and Air <br />Traffic Safety <br />May reduce traffic volumes <br />Effective in slowing vehicles traveling at typical residential speeds to <br />approximately 5 to 15 mph depending on type installed at the device may <br />reduce overall speeds by 5 to 7 mph. <br />May have an increase of noise at the bumps /humps <br />Traffic safety has not been found to be compromised with these devices. Traffic <br />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 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. Thus, a <br />neighborhood considering speed hump installation would require two to three <br />installations. <br />Vertical Elements Speed Bumps /Humps/Tables <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 roadway <br />perpendicular to the traffic flow. Typically <br />used to reduce vehicle speeds. <br />APRIL 2005 <br />Speed Table <br />Speed Bump <br />Source: Institute of Transportation Engineers Traffic Calming: State of <br />Practice <br />29 <br />