Agenda - Council - 12/10/1996 - Laserfiche WebLink

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anywhere from a slight reduction in noise ' level tO an increase in noise level. The noise level at the bumps/humps is dependent upon the speed at which the vehicles traverse them. Because of their effect in slowing traffic, bumps/humps tend to have a negative im- pact on air quality and energy 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 installed. Traffic safety benefits can be gained ff speeding is involved. Community Reaction. The initial reaction of the people living in the area of the installation is generally positive, while negative reaction can occur from those people who produce through traffic trips in the area. 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 · should be designed and installed accordingly us~g accepted engineering principles and judgement. Cost The cost of constructing a speed hump has been found to be in the range of $1,000 - 'fi2,000. Speed bumps cost approximately $500- $1,000. Neighborhood Traffic Control January 1994 Additional Considerations The impact on maintenance activities such as snowplowing .and street sweeping is mini- mal. Speed bumps/humps can significantly im- pact'large trucks, transit and school buses. If used on regular routes of these vehicle types, attention should be given to in_forming these drivers of proper operation necessary to min- imize impacts. Case Study A series of three speed humps were installed on Homestead Drive in Appleton, Wisconsin. From a technical standpoint, the speed humps were effective in reducing the 85th percentile 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 prior to the installation of the speed humps returned after the speed humps were removed. Institute of Transportation Engineer~ Residential Street Design and Traffic Control A Prop,ct, ed Recommended Practice of the Institute of Transporta. Lion Engineeva by the Technical Council Speed Humpo Ta~k Force Guidelines for the Design and Application of Speed Huml~. 24-2 I I I I I I I I I I I I ! I I I