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anywhere from a slight reduction in noise <br /> "level t6 an increase in noise level The noise <br /> level at the bumps/humps is dependent <br /> upon the speed at which the vehicles traverse <br /> them. <br /> <br /> Because of their effect in slowing traffic, <br /> bumps/humps tend to have a negative im- <br /> pact on air quality and energy consumption. <br /> <br /> Traffic Safety. Traffic safety has not been <br /> found to be compromised with speed bumps <br /> and speed humps as long as proper design <br /> and installation procedures are followed <br /> when they are instMled. Traffic safety benefits <br /> can be gained if speeding is involved. <br /> <br /> Commurdty Reaction. The initial reaction of <br /> the people living in the area of the installation <br /> ks generally positive, while negative reaction <br /> can occur from those people who produce <br /> through traffic trips in the area. The reaction <br /> of the people living in the area can change <br /> over time. <br /> <br /> Legal As defined by the Manual on Uniform <br /> Traffic Control Devices, 'speed bt:raps and <br /> speed humps are not traffic control devices. <br /> They are geometric design features and <br /> should be designed and installed accordingly <br /> Us'.mg accepted engineering principles and <br /> judgement. <br /> <br /> Cost <br /> <br /> The cost of constructing a speed hump has <br /> been found to be in the range of $1,000 - <br />'$2,000. <br /> <br />Speed bumps cost approximately $500~ <br />$1,000. <br /> <br />Neighborhood Traffic Con~oI <br /> <br />January ] 994 <br /> <br /> Additional Considerations <br />The impact on maintenance activities such as <br />snowplowing .and street sweeping is mini- <br />mal. <br /> <br /> Speed bumps/humps can sigrdf-icantly i_m- <br /> pact'large trucks, transit and school buses. If <br /> used on regular routes of these vehicle types, <br /> attention should be given to informing these <br /> drivers of proper operation necessary to min- <br /> imize impacts. <br /> <br /> Case Study <br /> <br /> A series of three speed humps were installed <br /> on Homestead Drive in Appleton, Wisconsin. <br /> From a technical standpoint, the speed <br /> humps were effective in reducing the 85th <br /> percentile speed from 34 mph to 26 mph. One <br /> and five months after the installation of <br />year <br />the speed humps, they were removed. The <br />removal was prompted by a survey of the <br />neighborhood residents who directly abutted <br />the street that the speed humps were on. This <br />experience allowed for two winters of main- <br />tenance and found that their presence did not <br />create any unusual street maintenance <br />probIems. It is interesting to note that the <br />vehicle speeds found to exist pri6r to the <br />installation of the speed humps returned <br />after the speed humps were removed. <br /> <br />Institute of Transportation Engineers Residential Street Design <br />and Traffic Control <br /> <br />A Proposed Recommended Pradice of the Ins~dhate of Transporta. <br />tlon Engineers by the Technical Coundl Speed Hump~ Task Force <br />Guidelines for the Design and Applkafion of Speed Humi:m. <br /> <br /> <br />