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SPEED BUMfS/HURdPS <br /> <br />CHAPTER <br /> <br />24 <br /> <br />Speed 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. Speed 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 /> briO. They are typically used in low speed <br /> parking lots and alley situations. Speed <br /> humps, on the other hand, are generally 3 to <br /> 4 inches high with a leng~ of approximately <br /> 12 feet ('longer than the wheel base of an <br /> automobile). <br /> <br /> Effects <br />Volumes. Speed bumps and speed humps <br />w/Il often reduce traffic volumes on the <br />sweets 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 the ava/lability 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 Control <br /> <br />Jan uat-y ]994 <br /> <br />Speed Bump <br /> <br /> and generally results in.vehicles slowing to <br /> 5 mph or less at the bump. At high speeds, <br /> bumps tend to have Ies's overall vehicle ira- <br /> because the vehicle suspension quickly <br /> pact <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 still <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 /> Ill <br /> <br />Speed bumps or speed humps should only <br />be installed 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 ff spaced at less than <br />800 feet. Once spacing exceeds 800 feet, the <br />effect on speed is only in the immediate1 <br />vidn/t-y of the bump/hump. <br /> <br />Traffic NoNe, Air Quality a_nd Energy Con- <br />sumpffon- 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 />