Description: Chicanes incorporate the use of pavement markings, planting strips, on-street
parking, etc., to create a sequence of horizontal curves (i.e., horizontal deflections) intended to
slow vehicles.
Speed Estimate:
A gateway treatment with and without horizontal deflections reduced speeds of the same
magnitude (Lamberti et al., 2009) .
Reduced 85th percentile speed from 31 to 28 mph (Macbeth, 1998) .
6% reduction in 85th percentile speeds (Corkle et al., 2001) .
85th percentile speed reduced from 45 to 35 mph. Reduction in mean speed from 36 to 29 mph.
Number of vehicles traveling 10 mph above speed limit reduced from 35% to 3% (Hallmark et
al., 2007) .
Reduced speeds by 26% (Charlton and Baas, 2006) .
Safety Estimate:
No data found.