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,! <br /> <br /> ! <br /> ! <br /> ! <br /> ! <br /> ! <br /> ! <br /> ! <br /> ! <br /> ! <br /> <br />! <br /> <br />SPEED BUMPS/HUMPS <br /> <br />CH^PT r <br /> <br />S Hump <br /> <br /> Speed bumps :and speed humps are raised <br /> areas in the roadway surface which extend <br /> across the roadway perpendicular to the traf- <br /> fic flow. Speett bumps are generally 3 to 6 <br /> inches high with a length of 1 to 3 feet <br /> (shorter than the wheel base of an automo- <br /> bile). They are typically used in Iow speed <br /> parking lotg i and alley situations. Speed <br /> humps, on the other hand, are generally 3 to <br /> 4 inches high with a length of approximately <br /> 12 feet (longer than the wheel base of an <br /> automobile). <br /> <br /> Effects <br /> <br />Volumes. Speed bumps and speed humps <br />w/il often reduce traffic volumes on the <br />streets where ,they are employed. The degree <br />of traffic reduction is dependent upon the <br />number and the spacing of the <br />bumps/humps, the amount of cut through <br />traffic, and ithe availability of alternate <br />routes. Speed bumps/humps have been <br />used to deter-trucks and larger vehicles from <br />using a street. <br /> <br />Speed. A speed bump causes significant <br />driver discomfort at residential traffic speeds <br /> <br />Neighborhood Traffic ConSol <br /> <br />January 1994 <br /> <br />Speed Bump <br /> <br /> and generally results in .vehicles slowing to <br /> 5 mph or less at the bump. At h/gh speeds, <br /> bumps tend to have less overall vehicle im- <br /> pact because the vehicle suspension quickly <br /> absorbs the impact before the body can react. <br /> <br /> At typical residential speeds, speed humps <br /> cause some driver discomfort and result in <br /> most vehicles slowing to 15 mph or less at <br /> each hump. At higher speeds, the hump <br /> tends to act as a bump and severely jolts' the <br /> vehicle suspension and its occupants or <br /> cargo. <br /> <br /> Speed bumps or speed humps should only <br /> be instal/ed on streets where the prevailing <br /> speed limit is 30 mph or less. <br /> <br />These devices generally have a continuous <br />effect on vehicle speeds if spaced at less than <br />800 feet. Once spacing exceeds 800 feet, the <br />effect on speed is only in the immediate <br />vicirfity of the b_ ump /hump. <br /> <br />Traffic Noise, Air Quality and Energy Cort- <br />sumption. Traffic noise is generally reduced <br />slightly between the bumps/humps on low <br />volume local streets. At the speed <br />bumps/humps, experience has shown <br /> <br /> <br />