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U.S. Department of Transportation
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Incident Scene Work Zone Alerts for Drivers and Workers (INC−ZONE)
§Comprised of two components:
1.Alerts drivers of lane closings and unsafe speeds for temporary work zones
▪Could be augmented with merging and speed guidance to drivers
2.Warns on-scene workers of vehicles with trajectories or speeds that pose a high risk to their safety
http://ops.fhwa.dot.gov/publications/fhwahop05029/images/fig09.jpg
The Incident Work Zone Alerts for Drivers and Workers application has two components, one that warns drivers that are approaching temporary work zones at unsafe speeds, and or trajectory.

And another that warns law enforcement officials working in the zone through an audible warning system.