Use and Validation of Risk-Weighted Speed Observation Data for Countermeasure Evaluation
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چکیده
In the absence of suitable crash data, speed observation data can give an indication of the effectiveness of speed-related road safety countermeasures. It is proposed that the use of risk-weighted data is more appropriate. The aim of this investigation was to develop a method for risk-weighting speed observation data in both urban and rural areas for use as an evaluation tool. Speed observation data was weighted by the appropriate risk of a casualty crash. This enabled the magnitude of the reduction in casualty crashes that could have been expected from a change in the on-road speed distribution to be estimated. The outcomes were validated against the results of a crash-based evaluation of a speed-related enforcement package that was implemented in Victoria from December 2000 until July 2002. They were generally consistent with the crashbased evaluation after the degree of representation of the collected speed observation data was taken into account.
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