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Record the location, type, severity and cause of each accident, as well as the traffic and weather conditions in which it occurred. Use this information to develop the most cost-effective accident prevention program.

• For sites with accidents caused by excessive speed, consider speed sensors and signs warning motorists if they are driving too fast. 
  
  
• Where the safe driving speed has been reduced by bad weather, construction, or an accident, consider setting a lower speed limit and communicating it via variable message signs or highway advisory radio.
  
  
• For locations at which slow or stopped traffic causes rear-end collisions, consider posting warnings on variable message signs that are triggered by traffic occupancy.
   
• For curves at which trucks are likely to lose control, consider a system to weigh the trucks in motion, calculate their speed, determine if they are likely to lose control, and warn them via a variable message sign.
  
  
• If sudden onsets of fog are a cause of accidents, consider installing fog sensors and warning signs upstream of the location.