Agenda Packets - 1990/11/19 - Laserfiche WebLink

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GEOMETRIC FEATURES FOR NEIGHBORHOOD TRAFFIC CONTROL 99 • Violations.Prevention is best done by assuring that the channelization covers a significant part of the intersection,thereby narrowing the area where illegal turn- ing movements can be made. • Emergency Passage. High speed emergency passage is generally difficult to provide for without also providing for easy violation of the intent of the device. However, emergency vehicles can usually maneuver around channelization without severe delay. • Pedestrians, Bicycles, and the Handicapped. Special care should be given to providing routes for bicycles through a channelized area;otherwise,cyclists will tend to make their own way,often in violation of the channelization and some- times at a hazard to themselves. Islands designed to give adequate refuge for pedestrians should also provide for ramps for wheelchairs. Diagonal Diverters A diagonal diverter is a barrier placed diagonally across an intersection to,in effect,con- vert the intersection into two unconnected streets,each making a sharp turn(Fig.5.7).The primary purpose of a diagonal diverter is the same as that of forced-turn channelization— to break up through routes,making travel through a neighborhood difficult,while not ac- tually preventing it. If used at a single site,the diagonal diverter is effective only when the neighborhood it is intended to protect is a limited one.If the neighborhood is larger,with other continuous residential streets parallel to the"problem street,"installation of a single diagonal diverter may merely shift through traffic to another local street.rather than to bounding major and collector streets.In actual application,this device is therefore often best used as part of a system of devices which discourage or preclude travel through a neighborhood. The basic advantage of a diagonal diverter over a cul-de-sac is that,by not totally prohibiting the passage of traffic,it tends to reduce the circuity of travel imposed on local -"wilt • Air•-se I •e%:,-0•44\/i, / 4P1- • • Figure 5.7 Diagonal diverter. (a) (b) 7 , P>� fi- * ,moi (c) (d)