Further to my letter in the last issue, I have now had the chance to look at the report about speed cameras by Professor Richard Allsop in more detail. One of the pleasant surprises was to find an actual example of the safety camera data he used in his analysis. A picture is worth a thousand words so I have shown the data in the accompanying chart.
The most significant features of the chart are:
The values of killed and serious injuries (KSIs) in the selection period are very similar to...
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