A fix from afar

There are 58 variable message signs (VMS) positioned at strategic locations along freeways in Orange County, California. They are maintained by the California Department of Transportation (Caltrans) and controlled from the district’s transportation management center. The signs give information about traffic conditions, travel times, alternate routes, and public service announcements. Each sign requires continued monitoring and maintenance by Caltrans. Maintenance requires staff to drive to the location of the sign to examine it, which requires many hours and a great deal of fuel. Maintaining the signs at the side of the road can be hazardous and has resulted in a number of fatalities. Caltrans has developed a remote diagnostic system for VMS, which is still in its early stages but has already increased safety and efficiency.


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01520037
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 28 2014 9:43PM