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Report numberRA-2006-86
TitleEffects of infrastructural traffic safety measures: effect of visible speed control on motorways.
SubtitleInternational literature review
AuthorsFrank Van Geirt
Published byPolicy Research Centre for Traffic Safety 2002-2006
Number of pages28
Date03/05/2006
ISBN
Document languageDutch
Partner(s)PHL
Work packageOther: Infrastructure and space
Summary

In this literature review, the effect of the visibility of speed controls on the number of injury accidents and the average speed on motorways is investigated. Since the number of studies on motorways is very limited, this study is extended to roads with speed limits from 80 to 120 km/h.

 

Visible (overt) speed controls come with varied results. As well negative as positive results are found. The effect varies from a decrease of -38% to an increase of +50% on the number of injury accidents.

 

The invisible controls give better results. The effect varies from a decrease of -10% to a decrease of -70% on the number of injury accidents. The average speed decreases with -1.6 to -2.8 km/h on the complete investigation area, controlled and uncontrolled sections.

 

A broad public support is achieved with publicity campaigns before and during the speed controls.

 

On roads with speed limits from 80 – 120 km/h, the best results are found with invisible systems of a mixture of visible and invisible controls. The speed controls always have to be implemented together with clear publicity campaigns.

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Mission

The Policy Research Centre for Traffic Safety carries out policy relevant scientific research under the authority of the Flemish Government. The Centre is the result of a

cooperation between Hasselt University, KU Leuven and VITO, the Flemish Institute for Technological Research.

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