After a ramp rollover warning system was installed at three curved exit ramps on the beltway around Washington, DC, there were no accidents at any of these sites during the three year post deployment test period evaluated.
Date Posted
09/21/2000
Identifier
2007-B00433
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A ramp roll-over warning system was installed at three curved exit ramps on the beltway around Washington, DC in 1993. On-site sensors and computers detected truck speeds, weight, and height classification, and then calculated the probability a truck would roll over as it approached. If a truck was at risk, a roadside warning sign was activated to alert drivers to slow down.

At the 3 sites evaluated, historical data indicated there were 6 accidents at the Maryland site from 1985 - 1990, and 2 accidents at each of the Virginia sites from 1986 - 1989. After the system was installed, there were no accidents at any of these sites during the three year post deployment test period evaluated (1993 - 1997).
Goal Areas
Deployment Locations