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anywhere from a slight reduction in noise <br /> level tO 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 installed. Traffic safety benefits <br /> can be gained if speeding is involved. <br /> <br /> Community Reaction. The initial reaction of <br /> the people living in the area of the installation <br /> is 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 bumps 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 /> Cos~ <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 /> Additional Considerations <br /> The Lmpact on maintenance activities such as <br /> snowplowing and street sweeping is mini- <br /> mal. <br /> <br />Speed bumps/humps can significantly im- <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 <br /> speed <br /> from 34 mph to 26 mph. One <br />year and five months after the installation of <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 />problems. It is interesting to note that the <br />vehicle speeds found to exist prior to the <br />installation of the speed humps returned <br />after <br /> the <br /> speed humps were removed. <br /> <br />Institute of Transportation Engineers Residential Street Design <br />and Traffic Control <br /> <br />A Propoe, ed Recommended Practice of the Ir~fitute of Transporta- <br />t. ion Englneem by the Technical Coundl Speed Huml~ Task Force <br />Guidelines for the Design and Appllcatlon of Speed Humps. <br /> <br />.~ Neighborhood Traffic Control <br /> <br />January 1994 <br /> <br />24--.2 <br /> <br /> <br />