Institute of Transportation Engineers




Traffic Calming Measures - Chicane


Description:

  • a series of narrowings or curb extensions that alternate from one side of the street to the other forming S-shaped curves
  • also called deviations, serpentines, reversing curves, twists, and staggerings

Applications:

  • appropriate for midblock locations only
  • most effective with equivalent volumes on both approaches
  • typically, is a series of at least three curb extensions
  • can use on-street parking to create chicane
Closure
Closure Schematic

Design/Installation Issues:

  • unless well-designed, chicanes may still permit speeding by drivers cutting straight paths across the center line
  • 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

Potential Impacts:

  • no effect on access
  • limited data available on their effect on speed, volume, and collisions
  • street sweeping may need to be done manually
  • can impact parking and driveway access
  • provides opportunity for landscaping

Emergency Response Issues:

  • limited data available on their effect on delay to emergency response
  • emergency response typically prefer two-lane chicanes to speed humps

Typical Cost:

  • reported costs range between $5,000 and $15,000 (1997 dollars)

 

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SPEED HUMP | SPEED TABLE | RAISED INTERSECTION | CLOSURE | NEIGHBORHOOD TRAFFIC CIRCLE | CHICANE | CHOKER | CENTER ISLAND NARROWING


Institute of Transportation Engineers
1627 Eye Street, NW, Suite 600 | Washington, DC 20006 USA
Telephone: +1 202-785-0060 | Fax: +1 202-785-0609
ite_staff@ite.org

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2016 Institute of Transportation Engineers