Offset curb extensions on residential or low volume downtown streets create a chicane effect that slows traffic speeds considerably. Chicanes increase the amount of public space available on a corridor and can be activated using benches, bicycle parking, and other amenities.
Recommended
A chicane design may warrant additional signing and striping to ensure that drivers are aware of a slight bend in the roadway.
Optional
Where application of a curb extension adversely impacts drainage, curb extensions may be designed as edge islands with a 1–2-foot gap from the curb.
Curb extensions can be implemented using low-cost or temporary materials. In such cases, curb extensions should be demarcated from the existing roadbed using temporary curbs, bollards, planters, or striping.
Chicanes may be designed using a return angle of 45 degrees, or a more gradual taper and transition, resulting in an S-shaped roadway.
A chicane configuration may also be created using a “checkered” parking scheme.
SAN FRANCISCO, CA
A chicane was added to slow speeds entering this residential block.