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SPEED BUMPS / LrM PS <br /> <br />CHAPTER <br /> <br />Speed t-Iump <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 /> bile). 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 length of approximateIy <br /> 12 feet (]onger than the wheel base of an <br /> automobile). <br /> <br /> Effects <br />VoIumes. Speed bumps and speed humps <br />will 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 the availability of alternate <br />routes. Spee.d 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 /> 75& <br /> <br />Neighborhood Traffic Control <br /> <br />January 1994 <br /> <br />I <br /> <br />I <br /> <br />Speed Bump <br /> <br />I <br />I <br /> <br /> and generally result~ in .vet'dcles slowing toI <br /> 5 mph or less at the bump. At high speeds, I <br /> bumps tend to have les's overall vehicle <br /> II <br /> because the vehicle suspension quicklyI <br />pact <br /> absorbs the impact before the body can react. <br /> typical residential speeds, speed humpsi <br />.At <br />.cause some driver discomfort and result in <br />most vehicles slowing to 15 mph or'less <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 /> I <br /> Speed bumps or speed humps should only I <br /> be installed on streets where the prevaLling <br /> speed limit is 30 mph or less. I <br /> These devices generally have a continuous <br /> effect on vekicle speeds ff spaced at less than I <br /> 800 feet. Once spacing exceeds 800 feet, the <br /> effect on speed is only in the LmmediateI <br /> vkinity of the bump/hump. <br /> <br />Traffic Noise, Air Quality and Energy Con- I " <br />sumptioru Traffic noise is generally reduced <br />slightly between the bumps/humps on lowI ~ <br />volume local streets. At the speed I <br />bumps/humps, experience has shown <br /> <br />I <br /> <br /> <br />