By Reid H. Ewing
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Additional resources for Traffic Calming: State of the Practice
Example text
Sacramento, CA, for example, requires majority support for other traffic calming measures, but a super-majority (two-thirds) for speed humps. The rough ride has an upside—effectiveness in slowing traffic. The 12-foot hump is one of many hump profiles, varying in height, length, and shape. In 1992 Portland, OR, conducted field tests of different profiles. The 12-foot hump was judged too abrupt. Portland opted instead for 14-foot parabolic humps and 22-foot, flat-topped humps (called speed tables in this report).
Traffic problems being addressed by traffic calming are not all the same. By classifying measures in broad categories—such as “humps” and “closures/diverters”—national surveys have missed this trend toward diversification. Longer humps and speed tables were developed as substitutes for 12-foot humps. Realigned intersections were devised, in part, because less expensive options such as traffic circles were not effective at T-intersections. 8). 35). 36). 37). 38). The search for appropriate treatments has also led to combinations of measures at different points along the same street.
Measure Views Street closures Mildly in favor as long as efficient through connections are maintained for bicyclists Speed humps Strongly in favor as long as cross sections are not sloped across bike lanes Raised crosswalks (speed tables) Strongly in favor as long as cross sections are not sloped across bike lanes and crosswalks are not textured Raised intersections Opposed due to their high cost Traffic circles Opposed due to their high cost, danger to merging cyclists, and confusion for motorists—somewhat tolerable at low traffic volumes Neckdowns Mildly in favor as long as cyclists are not forced to merge with cars Medians (center islands) No consensus—opposed if cyclists are crowded together with fast-moving cars STOP signs Mildly in favor Speed radar trailer Mildly in favor Photo-radar Strongly in favor Source: Boulder Bicycle Commuter (BCC) meeting minutes, 2 October 1997.