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Establish an accident database with the location, time, nature, and cause of accidents as well as the traffic conditions in which they occurred.

Rear end collisions

• Consider signal coordination to reduce sudden stops.
  
  
• Consider variable message signs triggered by traffic occupancy to warn of slow or stopped traffic ahead.

Intersection collisions

• At signalized intersections, consider signal coordination or video red-light monitoring to reduce incentives to run red lights.
  
• For collisions due to vehicles crossing a busy street, consider installing an actuated signal that is green for arterial traffic except when actuated by cross traffic.
  
  
• At un-signalized intersections with recurring accidents, consider speed sensors and warning signs for vehicles approaching too rapidly.

Rail crossing collisions

• At hazardous rail crossings, consider installing a highwayørail warning system to prevent impending collisions.

Single car accidents

• In locations where excessive speed causes accidents consider:

• variable message signs that show safe speeds under current conditions
  
• sensors that detect vehicle speeds
  
• a sign that both displays each vehicle's speed as it approaches and issues a warning if the speed is excessive
• video cameras that record license numbers of vehicles that are exceeding the speed limit

Bicycle and pedestrian accidents

• To avoid bicycle accidents at signalized intersections with high bicycle traffic, consider bicycle-actuated signals.
  
  
• To avoid pedestrian accidents, consider pedestrian-activated signals, countdown signals for crossings that span wide streets, and crosswalks with ground-level lights that go on when pedestrians are crossing.

Collision avoidance research