Device name(s): Intersection Geometry Changes

road intersection geometry

Approximate Cost:

Definition: Intersection geometry changes introduced traffic modification and control through channeling, redirection, and tightening turn radii. Proper design can reduce aggressive driver action and calmer traffic. Intersection geometry changes may incorporate several other measures to achieve the requested result.

Fast Facts:

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


  • reduces aggressive driver incident/accident potential
  • improves pedestrian safety
  • can be used to narrow excessively wide intersections
  • slows turning traffic


  • may reduce on-street parking
  • can be expensive if utility work is required


  • 85th percentile speed is 5 mph above the speed limit or greater