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<a href="/ITS/benecost.nsf/SingleLink?ReadForm&Tax=Intelligent+Transportation+Systems+Crash+Prevention+%26+Safety&Location=Cost">Crash Prevention & Safety</a> > <a href="/ITS/benecost.nsf/SingleLink?ReadForm&Tax=Intelligent+Transportation+Systems+Crash+Prevention+%26+Safety+Collision+Avoidance&Location=Cost">Collision Avoidance</a> > <a href="/ITS/benecost.nsf/SingleLink?ReadForm&Tax=Intelligent+Transportation+Systems+Crash+Prevention+%26+Safety+Collision+Avoidance+Road+Departure+Warning&Location=Cost">Road Departure Warning</a>

Road departure warning systems have been tested using machine vision and other in-vehicle systems to detect and alert drivers of potentially unsafe lane-keeping practices and to keep drowsy drivers from running off the road.

Crash statistics show that lane departure warning systems have reduced all relevant crashes by 11 percent, and all relevant injury crashes by 21 percent, controlling for driver demographics.(August 2017)

Casualty benefits from advanced emergency braking systems in passenger vehicles have potential benefit-to-cost ratios ranging from 0.07 to 2.78.(November 2011)

In Michigan, 108 volunteers who drove 16 vehicles equipped with crash warning systems indicated the blind-spot detection component of the lane-change/merge crash warning system was the most useful and satisfying aspect of the integrated system. (June 2011)

In Michigan, 8 of 108 volunteers who drove light vehicles equipped with an integrated crash warning system indicated the system prevented them from having a crash.(June 2011)

Widespread deployment of integrated countermeasure systems could prevent over 48 percent of rear-end, run-off-road, and lane change crashes.(August 2005)

A 1999 FHWA study suggested that lane departure warning systems have the potential to reduce road departure crashes by 10 percent for passenger vehicles and 30 percent for heavy trucks.(December 1999)

In-vehicle computer visioning technology designed to detect and warn truck drivers of lane departure and driver drowsiness reduced fuel consumption by 15 percent, increased safety, and provided drivers with more comfortable working conditions.(20 July 1999)