For John Dales to dismiss the case against removing guardrails as “hogwash” is rather naive, in the absence of supporting evidence. His main argument that “there are all sorts of possible explanations” for London’s escalation of pedestrian accidents is answered by my use of scientific method. That is the cornerstone of good science but is regrettably rare in road safety research, which may be why John fails to recognise it.
In essence, scientific method starts with...
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