Risk management it's not rocket science, he would say. It's more complicated. He produced groundbreaking work on road safety and expanded the concept of risk compensation' a theory that suggests people adjust their behaviour in response to perceived levels of risk.
He posited the view that everyone has an individual risk thermostat, which can frustrate the imposition of safety measures by reasserting the level of risk that an individual was originally comfortable with. This explains, for example, why motorists drive faster while wearing seatbelts.
His 1995 book Risk is considered a leading study on the subject, while his work on the social implications of hypermobility the growth in long-distance journeys was even more significant.
John was not the only critic of cost-benefit analysis, his tough approach combined with an ability to find humour amid the statistics made him one of the most effective at skewering its limitations.
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