Safety in Numbers

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skydancer in reply to @The_Seldom_Killer

The factors affecting probability can be divided into two broad categories. a) The opportunity for a collision to happen and b) the likelihood that it will. A is about environmental factors such as infrastructure and traffic density. B is about road user behaviour.

This doesn't make sense. Why is 'opportunity' linked to infrastructure and 'likelihood' to road user behaviour?

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The_Seldom_Killer in reply to @skydancer

Opportunity is linked to infrastructure because if it prevents a driver from causing harm regardless of their behaviour. Likelihood is linked to behaviour because when presented with an opportunity, it's the road user behaviour that will determine whether something then does happen.

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