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And that right there is the real issue. Each individual on the road ranks the risks of their tasks diferently depending on a number of factors, including age, intelligence, experience, education amongst others.

If it is possible to have everyone identify and rank the risks they face the same way, then every incident on the road would be a genuine accident and not caused by someone doing the wrong thing.
Unfortunatly, this is a theoritical target, that even the best organisations with all the money in the world are yet to achieve, let alone governements with limited funds and dealing with the public.

I can rant all day about this stuff, but thats not the point.
Everyone is different, and all you can do is drive defensivly and just take your time.