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Study: Speed Cameras Curb Road Deaths

February 20, 2006

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A study by Israeli and American researchers, published in the American Journal of Preventive Medicine, says reducing speed limits and extensive use of speed camera networks could significantly reduce the number of road deaths in the United States.

If the United States had implemented the speed control policies of the United Kingdom during the 1990s, and had it not raised speed limits, the researchers say there would have been, at the minimum, some 6,500 to 10,000 (16-25%) fewer deaths per year.

The study recommends a large-scale test of speed camera networks in the U.S., where small increases in travel speeds resulted in a sustained death toll of more than 42,000 road deaths per year in the 1990s.

Speed cameras for detecting and deterring high travel speeds on the roads have barely been used in the U.S. But in other countries, notably the U.K., Australia and France, they have had a major impact on reducing road death tolls.

In the U.K., for example, the installation of speed cameras, roundabouts (traffic circles) and other measures in the 1990s reduced the number of road deaths by 33.9%. The reduction of road deaths was similarly high in other countries where speed limits were reduced.

Sweden experienced a 21% drop in fatal crashes, while the figure in Denmark dropped by 24%. In Victoria, Australia, road death tolls have fallen by some 50% in the last 15 years. In Queensland, Australia, 2,500 speed cameras were introduced between 1997 and 2001, resulting in a 31% drop in fatal crashes.

The researchers found that following the introduction of speed cameras in the U.K., the fall in case fatality -- the percentage of injured who are killed -- accounted entirely for the fall in road deaths.

The authors ruled out an array of other suspect causes for the U.K.-U.S. difference, including SUV's, trends in seat belt use, emergency care, and vehicle-miles traveled.

In 1995, the U.S. abolished the national maximum speed limit on interstate highways, and soon after 32 states increased their speed limits.

The result was that road deaths increased by 15% on Interstate highways, resulting in more than 450-500 more deaths each year). By 2003, most states had increased the rural interstate high speed limit to 75 mph – resulting in a 38% annual increase in road deaths (780 more deaths).

In Israel, road deaths nationwide increased by 15% after speed limits were raised from 90 to 100 kph on three inter-urban highways in 1993, and the effect has persisted.

The study says that detection and deterrence of increased speeds would substantially reduce the toll from drinking under influence of alcohol in the U.S. (some 17,000 deaths per year), which itself leads to driving at higher speeds.

The study was headed by Prof. Elihu Richter of the Hebrew University of Jerusalem and was jointly undertaken by a team from the Injury Prevention Center at the Braun Hebrew University-Hadassah School of Public Health and Community Medicine; the Department of Surgery & Trauma Center, Hadassah University Hospital; and the University of Illinois School of Public Health.

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