Traffic Calming Measures - Center Island Narrowing


Description:
  • raised islands located along the centerline of a street that narrow the travel lanes at that location
  • sometimes called midblock medians, median slow points, or median chokers

Aplications:

  • are often nicely landscaped to provide visual amenity and neighborhood identity
  • can help pedestrianize streets by providing a mid-point refuge for pedestrians crossings
  • sometimes used on wide streets to narrow travel lanes
  • work well when combined with crosswalks
Center Island Narrowing
Center Island Narrowing Schematic Potential Impacts:
  • may reduce parking and driveway access
  • reduces pedestrian crossing width
  • may visually enhance the street through landscaping but may also limit visibility of pedestrian crossings
  • bicyclists prefer not to have the travel way narrowed into path of motor vehicles
  • collision, speed and volume data are not available

Emergency Response Issues:

  • preferred by fire department/emergency response agencies to most other traffic calming measures

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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