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K. Traffic Calming Devices <br />1) Occasionally it is necessary to employ various <br />techniques to reduce vehicle speeds and/or shift <br />traffic to more appropriate routes. These tech- <br />niques are commonly referred to as "traffic <br />calming" measures. Traffic calming measures <br />can also be incorporated in the construction of <br />new streets to prevent problems from developing <br />in newly constructed or future residential areas. <br />Traffic calming devices are intended for use on <br />local streets but may be used on collector <br />streets. The application of these techniques is <br />based on a case-by-case basis using engineering <br />judgement. Planning and design should be <br />coordinated with nearby residents as well as <br />emergency and other service providers who will <br />be affected by their use. Table 3 indicates which <br />techniques are suitable for existing and new <br />streets. <br />Traffic Calming Device Locations <br />L. Grade <br />1) New street grades in excess of 20% are <br />prohibited. Maximum grade of 15% with up to <br />200' lengths of grade up to 20% is allowed, but <br />there shall be no intersections or driveway <br />access in areas with grades above 15%. <br />M. Private Streets and Alleys <br />1) Private local streets are required to be de- <br />signed to the same standards as public streets in <br />the following categories: <br />a) Intersection configuration (spacing and <br />intersection angles). <br />b) Minimum centerline radius length (Ameri- <br />can Association of State Highway and Trans- <br />portation Officials (AASHTO) standard). <br />Table 3 <br />Traffic Calming Device <br />Existing Street <br />New Streets <br />Traffic Circles <br />Speed Hump <br />IN <br />Raised Crosswalks <br />Curb Extensions <br />Chicanes <br />Traffic Diverters <br />Full Diverters -Street Closure <br />Half Diverter <br />Diagonal Diverter <br />Ell <br />Median Barrier <br />Forced Turn Channelization <br />Parking Bays <br />Pavement Surface Modifications <br />Speed Actuated Signing <br />EN J <br />* New speed humps are to be installed only at the direction of the City <br />Traffic Engineer. <br />* * Installation of diverters or street closures is subject to provisions of <br />Chapter 5 of the Eugene Code, 1971. <br />39 <br />