Roadway Operations & Maintenance > Work Zone Management > Speed Enforcement

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Evaluation studies in Canada, the Netherlands, and Australia showed that roadways equipped with automated speed enforcement can reduce the number of speeding vehicles by 27 to 78 percent.(13-17 January 2002)

In Texas, police who used remote camera/radar systems to enforce work zone speed limits noted improved safety to officers, but expressed some concern over effectiveness in identifying speeding vehicles.(13-17 January 2002)

An evaluation of work zone safety technologies in Texas showed that speed display trailers can reduce average vehicle speeds by 5 mi/hr and decrease the number of vehicles traveling at excessive speeds in rural work zones. (2000)

In Nebraska, a portable speed detection and warning system placed upstream from an I-80 work zone decreased the highest 15 percent of vehicle speeds by about 5 mi/hr as vehicles approached the work zone lane merge area.(May 2000)

Speed-activated dynamic message signs with warning messages reduced vehicle speeds by 8 to 9 mi/hr; sustained effects for long-term work zones.(December 1998)

At a work zone in South Dakota, a speed monitoring and display system reduced the number of speeding passenger vehicles and trucks by as much as 25 and 40 percent respectively.(1995)

Speed-activated dynamic message signs with warning messages reduced speeding vehicles by 50 percent or more in Virginia work zones. (August 1994)