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CHICANES
Chicanes can result in reduced speeds due to curved travel paths
Click here to view a standard layout for a Chicane
Chicanes are curb extensions or islands that alternate from one side of the street to the other, forming S-shaped curves.
They are appropriate for mid-block locations only. Most effective with equivalent volumes on both approaches. Typically consist of a series of at least three curb extensions. Can use on-street parking to create chicane. European manuals recommend shifts in alignment of at least one lane width, deflection angles of at least 45 degrees, and center islands to prevent drivers from taking a straight "racing line" through the feature.
Chicanes may also be called deviations, serpentines, reversing curves, twists, and staggerings.
(Source www.ite.org)
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Temporary Installation
Temporary Chicane |
Permanent Installation
Seattle, WA |
PROS
1. Volume and speed reduction possible.
2. Self-enforcing.
3. Provides opportunity for roadway beautification.
4. Can be landscaped.
5. Can be a "Gateway" feature.
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CONS
1. Must be designed to avoid drivers encroaching over center line.
2. Can affect street sweeping.
3. Parking can be affected.
4. Driveway access can be affected.
5. Potential Pedestrian/Bike/Car conflicts.
6. Potential for head-on collision.
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Summary of Effectiveness
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Volume Reduction
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Yes
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Speed Reduction
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Yes
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Safety Improvement
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Yes
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-
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-
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Streets to Use On Collector, Local
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Local
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Use on Bus Route
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With Care
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Use with Curbs and Gutters
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Yes
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Spot or Area-wide Use
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Both
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-
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-
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Emergency Service Access Issues
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Minimal
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Impacts on Arterials
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Possible
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Change in % Trucks
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Unknown
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Environmental Changes
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Unknown
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-
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-
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Dependence on Enforcement
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No
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Level of Violation
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N/A
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-
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-
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Aesthetics and Landscaping
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Possible
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