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Curb Extensions

A curb extension is a horizontal intrusion of the curb into the roadway, resulting in a narrower road section. Curb extensions increase pedestrian visibility for drivers and improve sight lines for pedestrians. As a result, pedestrians experience shorter crossing distances and drivers are required to slow down. Curb extensions can also create parking bays, narrowing the street and expanding the availability of on-street parking.

Application/Considerations/Outcomes

  • Appropriate for local, collector, and urban arterial streets
  • May interrupt bike lanes
  • May reduce on-street parking
  • May impact intersection operations through the reduction of lane provision
  • Reduced turning radii may impact emergency service vehicles and larger vehicles turning at the intersections
  • Potential damage to the curb during snow removal operations
  • Increased snow removal costs and operation time
  • Drainage system adjustments and utility relocations, such as utility poles and fire hydrants, may be required to accommodate roadway narrowing
  • Adequate clear sight triangles should be maintained within the curb extension; obstructions such as vegetation overgrowth and landscaping should not limit the sight distance at intersections

Image sources: NACTO

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