Knowledge Resources

In Washington D.C., allowing transit vehicles priority during a no-notice evacuation resulted in a 26 percent time saving for transit buses without impacting on personal vehicle travel time.(May 2011)

Adaptive signal control systems deployed in five metropolitan areas have reduced delay 19 to 44 percent.(December 2000)

Adaptive signal control systems reduced vehicle stops by 28 to 41 percent; improve safety.(December 2000)

Adaptive signal control can lower operations and maintenance costs.(December 2000)

Arterial information allows travelers to make more informed decisions.(December 2000)

Modeling indicated that emergency vehicle signal preemption at three intersections on a Virginia arterial route increased average travel time by 2.4 percent when priority was requested.(July 1999)

An emergency vehicle signal preemption system in Houston, Texas reduced emergency vehicle travel time by 16 to 23 percent.(April 1991)

In Denver, Colorado emergency vehicle signal preemption reduced response time by 14 to 23 percent.(5 October 1978)