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• If sudden onsets of fog are a cause of accidents, consider installing fog sensors and warning signs upstream of the location. 
  
  
• For areas in which ice creates a hazard, consider a system to warn of the impending formation of ice so that drivers can slow down or put on chains.
  
  
• For areas with snow, consider an integrated program of weather forecasting and detection, snow removal, traveler information, and traffic control.