Institute of Transportation Engineers





Transoft Solutions


Traffic Calming Measures - Choker


Description:
  • curb extensions at midblock or intersection corners that narrow a street by extending the sidewalk or widening the planting strip
  • can leave the cross section with two narrow lanes or with a single lane
  • at midblock, sometimes called parallel chokers, angled chokers, twisted chokers, angle points, pinch points, or midblock narrowings
  • at intersections, sometimes called neckdowns, bulbouts, knuckles, or corner bulges
  • if marked as a crosswalk, they are also called safe crosses

Applications:

  • local and collector streets
  • pedestrian crossings
  • main roads through small communities
  • work well with speed humps, speed tables, raised intersections, textured crosswalks, curb radius reductions, and raised median islands
Choker
Choker Schematic Design/Installation Issues:
  • some applications use an island which allows drainage and bicyclists to continue between the choker and the original curb line
  • typically designed to narrow road to 20 feet for two-way traffic; typically avoid the use of widths between 13 and 17 feet
  • adequate drainage is a key consideration
  • provides opportunity for landscaping
  • vertical delineators, bollards or object markers are often used to make visible to snowplow operators

Potential Impacts:

  • can impact parking and driveway access
  • reduces pedestrian crossing width and increases visibility of pedestrian
  • speeds have typically been reduced on average by 4 percent for two-lane chokers and 14 percent for one lane chokers
  • minor decrease in traffic for two-lane and 20 percent reduction for one-lane chokers
  • collision data not available
  • bicyclists prefer not to have the travelway narrowed into path of motor vehicles

Emergency Response Issues:

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

Other/Special Considerations:

  • one-lane chokers rely on regulatory signs and driver courtesy to work

Typical Cost:

  • approximately $7,000 to $10,000 (1997 dollars)






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Washington, DC
20006 USA
Phone: 202-785-0060
Fax: 202-785-0609
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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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2014 Institute of Transportation Engineers