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Planning Guidance for the Installation and Use of Technology Devices for Transportation Operations and Maintenance

ENTERPRISE Transportation Pooled Fund Study

RWIS Guideline 3 - Support Traveler Information Systems Through RWIS at Key Locations

Purpose: To gather real-time data describing atmospheric weather and road surface conditions in order to inform travelers of the conditions, either through pre-trip traveler information systems or through en-route information dissemination systems.

Engineering judgment should be used to assess potential implications that may result from installation of RWIS. This planning guidance does not mandate the use of RWIS.

1. The number of crashes occurring during weather events in the area surrounding the RWIS site (roughly 20 mile radius) is more than 5 per year.

AND

2. If there are unique geography conditions at the site that prohibit the prediction of accurate weather from such systems as NWS forecasts.

AND

3a. The area in consideration is prone to fog or other local (non regional) visibility restrictions (defined as 10 or more events per year where fog presents dangerous driving conditions).

OR

3b. The area in consideration is near an attraction or other draw (winter recreation area, college, resort area) that attracts visitors traveling at least 1 hour to reach the destination.

OR

3c. The area is along a regular commuter path.

OR

3d. The route does not have an alternate route.