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Further results from a trial comparing a hidden speed camera programme with visible camera operation.

Michael D Keall1, Lynley J Povey, William J Frith

  • 1Land Transport Safety Authority, Research and Statistics, Wellington, New Zealand. mdk@ltsa.govt.nz

Accident; Analysis and Prevention
|October 10, 2002
PubMed
Summary

Hidden speed cameras significantly reduced road speeds, crashes, and casualties. These safety improvements were sustained over two years, demonstrating the effectiveness of this traffic enforcement strategy.

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Area of Science:

  • Road safety
  • Traffic engineering
  • Accident prevention

Background:

  • Previous research indicated hidden speed cameras reduced speeds, crashes, and casualties.
  • The study evaluated a hidden camera program implemented in a trial area with a control area using visible enforcement.

Purpose of the Study:

  • To assess the sustained impact of a hidden speed camera program on road safety.
  • To analyze changes in speeds, crash rates, and casualty rates associated with hidden speed cameras.

Main Methods:

  • Comparison of data from a trial area with hidden cameras against a control area with visible cameras.
  • Analysis of two years of data to determine sustained effects.
  • Evaluation of public attitude changes during the trial period.

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Main Results:

  • Significant net falls in speeds, crashes, and casualties were observed in the trial area.
  • These reductions were sustained over the two-year data analysis period.
  • Public attitude changes were initially observed but largely reverted to pre-trial levels.

Conclusions:

  • The hidden speed camera program demonstrated sustained effectiveness in reducing speeds, crashes, and casualties.
  • The study could not isolate the impact of camera concealment from other program aspects, like increased ticketing.
  • The increase in speed camera tickets was an integral part of the evaluated hidden camera program.