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<br />SPEED HUMPS <br /> <br />DESCRIPTION: Speed humps are a gradual rise and fall in the pavement surface, usually with a <br />circular profile, to a maximum height of 3 inches over a distance of 12 to 14 feet in the direction <br />of travel. <br /> <br />APPLICATION: They are usually used in controlling maximum speeds. Typical average <br />speeds within lOO feet of the humps are not higher than 22 mph, and if positioned no further than <br />600 feet apart, they usually control average speeds to less than 30 mph and eliminate all speeds <br />above 40 mph. They also may reduce traffic volumes by about 10 to 20 percent if there is an <br />alternate travel path. They should be installed at 300 to 600 foot spacing and properly signed <br />with a l5-mph advisory speed. The preferred marking for humps is similar to the "zebra-striped" <br />crosswalk. Speed humps may be appropriate on local residential roadways and residential <br />collectors with traffic volumes less than 4,000 average daily trips. <br /> <br />LIMITATIONS: All speed hump plans must be approved by the Alameda County Fire <br />Department. Typically, speed humps delay emergency response vehicle approximately lO <br />seconds. Speed humps can not be placed within roadway curves due to sight distance issues and <br />they cannot be installed within 200 feet of an intersection. Additionally, speed humps cannot be <br />installed on grades steeper than 8%. Speed humps are not to be used on non-residential roadways <br />and on roadway with more than 4,000 average daily trips. <br /> <br />ADVANTAGES: <br />. Effective in reducing vehicle speeds <br />. Requires minimum maintenance <br /> <br />DISADVANTAGES: <br />. Increases emergency response times <br />. May increase traffic noise in vicinity of hump <br />. Several humps are required on long blocks in order to be effective <br /> <br />TYPICAL COST: Typical construction costs are $3,500 per hump. Typical annual maintenance <br />cost is $270 per hump. <br /> <br />Speed HlUlJp Speed BlUlJp <br /> <br /> <br /> <br />City of San Leandro, Engineering and Transportation Page 11 of 23 <br />4/20/06 NEIGHBORHOOD TRAFFIC CALMING PROGRAM <br />