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More reflections on Professor Allsop’s speed camera study

Richard Butchart, Hitchin SG4
19 February 2016
The graph gives a visual representation of the casualty data for one speed camera site in the table below.  See Richard Butchart’s letter. Table headings: PIC – Personal Injury Collisions (or slight injuries); KSI – Killed and Serious Injuries; CAS – Casualties of All Severity
The graph gives a visual representation of the casualty data for one speed camera site in the table below. See Richard Butchart’s letter. Table headings: PIC – Personal Injury Collisions (or slight injuries); KSI – Killed and Serious Injuries; CAS – Casualties of All Severity

 

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...

+83% more

 

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