Traveler Information

Giving information to travelers in route so they can plan trips or adjust routes due to congestion, incidents, or unsafe conditions.

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  • Highway advisory radio (HAR) transmits audio traveler information messages via radio to travelers within range of the signal. Roadside signs inform travelers of the radio frequency and often use flashing lights to alert travelers of advisory messages.

  • When a roadway detour to a parallel route is needed, it is necessary to communicate the detour clearly to travelers, as well as consider the transportation safety and efficiency needs on the┬áparallel/detour route.

  • Queue warnings inform drivers about stopped or slow traffic ahead to provide vehicles more time to slow down safely. Queue warning systems use real-time traffic detection to identify queues and roadside variable message signs (VMS) to display the warnings.

  • Road weather information systems (RWIS) monitor local roadway and weather condition information and alert an agency and the traveling public about inclement weather conditions. It can be highly customized to the specific weather conditions and detection needs of a given location.

  • Providing travelers with pre-trip and real-time information about travel times and potential delays can help them make alternate routing and timing decisions to avoid congestion.

  • Traveler information services use personal, connected devices to provide travelers with real-time and customizable information that is relevant to their specific travel needs. This can include location-based information about delays, incidents, weather-related messages, travel times, emergency alerts, route guidance, and more.

  • Variable message signs (VMS) are electronic roadside signs used to post traveler information messages to inform drivers of incidents, travel times, detours, special events, and other useful road conditions or travel information.