Evaluating the speed camera sites selection criteria in the UK

Introduction: Speed cameras have been implemented to improve road safety over recent decades in the UK. Although impacts of speed camera estimated thoroughly, criteria for selecting sites rarely studied. This paper evaluates current selection UK based on performance. Method: A total 332 and 2,513 control with traffic accident data are observed from 2002 2010. Propensity score matching method empirical Bayes employed compared estimate effects under different scenarios. Results: First, main characteristics meeting not identified. The results indicate that proximity school zones residential neighborhoods, as well population density, considerations when sites. Then official used evaluated, including site length (a stretch has a fixed or had one past), previous history, risk value numerical scale level). suggest 500 m should be achieve optimum cameras. Furthermore, most effective reducing crashes requirement minimum number historical killed seriously injured collisions (KSIs) is met. In terms value, it found can obtain optimal effectiveness greater than equal 30, rather recommended 22.