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Evaluating the speed camera sites selection criteria in the UK
Haojie Li1, Manman Zhu1, Daniel J Graham2
1School of Transportation, Southeast University, China; Jiangsu Key Laboratory of Urban ITS, China; Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies, China.
Journal of Safety Research
|March 3, 2021
Summary
UK speed camera effectiveness is optimized with specific site selection criteria. A 500m site length and a risk value of 30, rather than 22, maximize safety benefits and reduce road accidents.
Area of Science:
- Road safety engineering
- Traffic accident analysis
- Public policy evaluation
Background:
- Speed cameras are widely used in the UK to enhance road safety.
- Previous research has focused on the safety impact of speed cameras, but not on the criteria for selecting their sites.
Purpose of the Study:
- To evaluate the current criteria for selecting speed camera sites in the UK based on their safety performance.
- To identify optimal parameters for speed camera placement to maximize road safety benefits.
Main Methods:
- Analysis of road traffic accident data from 332 speed camera sites and 2,513 control sites (2002-2010).
- Application of propensity score matching and empirical Bayes methods to estimate safety effects.
- Evaluation of site length, historical accident data (killed and seriously injured collisions - KSIs), and risk value.
Main Results:
- Key site selection factors include proximity to schools, residential areas, and population density.
- An optimal site length of 500m was identified for maximizing speed camera safety effects.
- Speed cameras are most effective when a minimum number of historical KSIs are met and with a risk value >= 30 (compared to the recommended 22).
Conclusions:
- Current speed camera site selection criteria in the UK can be refined for improved safety outcomes.
- Adjusting site length and risk value thresholds can enhance the effectiveness of speed cameras in reducing road accidents.
- The study provides evidence-based recommendations for optimizing speed camera deployment strategies.
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