Device name(s): Chokers/Nubs

Chokers or Nums

Approximate Cost: $7,000 – $15,000 per pair

Speed Reduction: 3–6 mph

Definition: A choker is a pair of mid-block curb extensions that narrow the width of the travel way, thereby reducing motorists’ speed. Two lanes of travel are maintained, and bike lanes are pleased on the outside of the choker. Chokers increase pedestrian safety, space by both reducing the crossing distance and improving the line–of– site between pedestrians and vehicle operation. Additionally, space they created visual narrowing of the roadway, which typically results in the vehicle speed reductions. Pedestrian safety is enhanced when chokers are used in conjunction with other measures.

Fast Facts:

  • Can be used on Local Street- yes
  • Can be used on Collector- yes
  • Can be used on Arterial- no
  • Reduces Speed- yes
  • Reduces Volume-  no
  • Noise Impact- no
  • Restricts Access- no
  • Bicyclist Impact- possible
  • Transit Impact- possible
  • Parking Impact- yes
  • Emergency Response Impact- no


  • effective in reducing speeds
  • minimal affect on drainage
  • buffer for parked vehicles
  • traffic is slow to intersections
  • crossing distance reduced for pedestrian/bicyclists at intersections
  • no impact on emergency services
  • reduces pedestrian crossing distance and interval
  • makes pedestrian crossing points more visible to drivers
  • prevents vehicles from passing vehicles
  • enhances the street through landscaping


  • eliminates parking spaces
  • cannot use the narrow streets to the fire department minimums
  • may reduce number of off street parking spaces
  • landscape maintenance
  • may not reduce speed to the other measures


  • 85th percentile speed is 5 mph above the speed limit, or greater
  • 60% of households affected area must support

Chokers or Nubs