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SPEE <br /> <br />BUMPS/HUMPS <br /> <br />CHAPTER <br /> <br />24 <br /> <br />I <br /> <br />I <br />I <br /> <br />I <br />i <br /> <br />Hump <br /> <br />Speed Bump <br /> <br /> Speed bumps:and speed humps are raised <br /> areas in the roadway surface which extend <br /> across the road~way perpendicular to the traf- <br /> fic flow. SpeeO bumps are generally 3 to 6 <br /> inches high With a length of I 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 v~ith a length of approximately <br /> 12 feet (longer than the wheel base of an <br /> automobile). <br /> <br /> Effects <br />Volumes. Spe~d bumps and speed humps <br />will often rediace traffic volumes on the <br />streets where ~ey 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 ttxe availability of alternate <br />routes. Speed ibumps/humps have been <br />used to deter tracks and larger vehicles from <br />using a street. <br /> <br />Speed. A speed bump causes significant <br />driver discornfo~t at residential traffic speeds <br /> <br />Neighborhood TrafficiControl <br /> <br />January1994 <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 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 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 if spaced at less than <br />800 feet. Once spacing exceeds 800 feet, the <br />effect on speed is only in the immediate <br />vicinity of the bump/hump. <br /> <br />Traffic Noise, Air Quality and Energy Con- <br />sumption- Traffic noise is generally reduced <br />slightly between the bumps/humps on Iow <br />volume local streets. At the speed <br />bumps/humps, experience has shown <br /> <br />24-1 <br /> <br /> <br />