Abstract
This report describes a comprehensive evaluation study of an Automated Workzone Information System (AWIS) known as the Computerized Highway Information Processing System (CHIPS). The system is designed to use traffic sensors to detect traffic congestion in the work zone area. The system then delivers appropriate messages, using portable message signs, to motorists as they approach or pass through a work zone. CHIPS was deployed at a California Department of Transportation (Caltrans) work zone site near Los Angeles. The effectiveness of the system was evaluated based on three criteria: safety, diversion, and response from travelers.