Agenda - Council - 08/12/1997 - Laserfiche WebLink

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I I I I, I I. I I I. I. I I. I I I I I any'where from a slight reduction in noise "]eve] t6 an increase in noise level. The noise level at the bumps/humps is dependent upon the speed at which the vehides traverse them. Because of their effect in slowing traffSc, bumps/humps tend to have a negative im- pact on air quality and. en. ergy consumption. Traffic Safety. Traffic safety has not been found to be compromised with speed bumps and speed humps as long as proper design and installation procedures are followed when they are inst~Ued. Traffic safety benefits can be gained if speeding is involved. Con-u:n~ React:ion. The initial reaction of the people living in the area of the installaHon is generally positive, while negative reaction can occur from those people who produce through traffic trips in the a.rea. The reaction of the people living in the area can change over time. Legal .As defined by the Manual on Uniform Traffic Control Devices, 'speed bumps and speed humps are not traffic control devices. They are geometric design features and shouJd be designed a.nd instal]ed according]3,' L/s~ng accepted engineering principles and judgement. Cost The cost of construcf:ing a speed hump has been found to be in the range of $1,000 - '52,000. Speed bumps cost approximately $500- Neighborhood Traffic Control January ] 994 Additional Cotisiderations The impact on ma/ntenance activities such as snowplowing .and street sweeping is mini- mal. Speed bumps/humps can significantly ira- pact'large trucks, transit and school buses, tf used on regular routes of these vehicle attention should be given to informing these drivers of proper operation necessary to min- imize impacts. Case Sttzdy A series of three speed humps were installed on Homestead Drive in Appleton, Wisconsin. Prom a teah_nical standpoint, the speed humps were effective in reducing the 85th percen~e speed from 34 mph to 26 mph. One year and five months after the installation of the speed humps, they were removed. The removal was prompted by a survey of the neighborhood residents who directly abutted the street that the speed humps were on. This experience allowed for two winters of main- tenance and found that their presence did not create any unusual street maintenance problems. It is interesting to note that the vehicle speeds found to exist pritr to the installation of the speed humps returned after the speed humps were removed. Insdtu[e of Transportation Entllneer~ R~:~identlal Str=et and Traffic ~n~l A P~ g~ommend~ P~dke of ~e Imfi~ of T~Ma- fion ~n~ by ~e T~i~ GuldeHn~ for ~e D~ign and Appli~tlon ofS~d Hum~. 24-2