AWIS

To mitigate the hazards and traffic congestion associated with highway work zones, Caltrans is testing up to six different automated work zone information systems (AWIS). They advise drivers about conditions so that they use appropriate caution or travel on alternate routes. The systems also link to Caltrans' Transportation Management Centers (TMCs) and other Caltrans users to deploy traffic management schemes, including changeable message signs and lane control systems.

CCIT is evaluating the AWIS for Caltrans on the basis of:

• functionality
  
• reliability
  
• effectiveness
  
• cost
  

How does AWIS work?

Generally, these systems use advanced traffic sensors and computer technology to collect data and process it, providing motorists with real-time information about traffic conditions in the work zone. They also communicate the data to TMCs and networked local traffic control devices; usually changeable message signs (CMS).

Evaluation

CCIT, working with researchers at UC Irvine and UC Berkeley, is evaluating the different AWIS based on functionality and reliability, their impact on traffic
congestion and safety, and cost.

More specifically, the objectives are:

• to evaluate the quality of the traffic data that is gathered, available communications options, and the information messages given to motorists
  
• to evaluate the accuracy of traffic speed data and delay estimates and the dependability of the communications system used
  
• to evaluate effectiveness in reducing delays and accidents
  

The results will be used by Caltrans to develop better specifications for future AWIS deployments.