Evaluation of speed cameras finds reduction in injury crashes

A before and after study by the Norwegian Institute of Transport Economics, Transportøkonomisk institutt (TOI) of 223 speed cameras that were installed between 2000 and 2010 in Norway found a statistically significant reduction of injury crashes by 22 per cent on road sections between 100 metres upstream and one kilometre downstream of the speed cameras. For killed and severely injured (KSI) and on longer road sections none of the results are statistically significant. However, speed cameras that were i
January 30, 2015 Read time: 2 mins
A before and after study by the Norwegian Institute of Transport Economics, Transportøkonomisk institutt (TOI) of 223 speed cameras that were installed between 2000 and 2010 in Norway found a statistically significant reduction of injury crashes by 22 per cent on road sections between 100 metres upstream and one kilometre downstream of the speed cameras.

For killed and severely injured (KSI) and on longer road sections none of the results are statistically significant. However, speed cameras that were installed in 2004 or later were found to reduce injury crashes and the number of KSI on road sections from 100 m upstream to both one kilometre and three kilometres downstream of the speed cameras. Larger effects were found for KSI than for injury crashes and the effects decrease with increasing distance from the speed cameras.

At the camera sites (100 metres up- and downstream) crash reductions are smaller and non-significant, but highly uncertain and may be underestimated. The study has controlled for trend, volumes, and changes of speed limits and other road characteristics.

Regression to the mean is controlled for by using the Empirical Bayes method.
Enforcement

Related Content

  • Downward trend in Scotland’s road casualties ‘good news’ says IAM Roadsmart
    June 30, 2016
    Independent road safety charity IAM RoadSmart has responded to Transport Scotland’s release of provisional headline figures for road casualties in Scotland, saying it is good news that the long term downward trends in deaths and serious injuries on Scotland’s roads continue but the figures are still far too high. The figures for road casualties reported to the police in Scotland in 2015 show that the total number of casualties fell by three per cent between 2014 and 2015 from 11,307 to 10,950, to the lo
    Read More
  • Stepped speed limits improve workzone congestion and safety
    January 30, 2012
    Traffic flow has been improved, congestion eased and safety increased - by a system of 'stepped speed limits' introduced to UK roadworks. URS Scott Wilson principal consultant Jamie Uff reports
    Read More
  • Jenoptik cameras reduce collisions
    March 19, 2022
    An analysis has shown that Jenoptik’s average speed cameras can reduce fatal and serious collisions by 50%. Ben Spencer learns that this technology also requires an understanding of the local environment
    Read More
  • RAC research – ‘speed cameras cut accidents by a quarter’
    June 7, 2013
    New research by the UK’s RAC Foundation indicates that speed cameras reduce the number of fatal and serious collisions in areas where they are installed. Analysis of data for 551 fixed speed cameras in nine areas shows that on average the number of fatal and serious collisions in their vicinity fell by more than a quarter (twenty-seven per cent) after their installation. There was also an average reduction of fifteen per cent in personal injury collisions in the vicinity of the 551 cameras.
    Read More

Highlighted Content