>> Depends on the intersection, sometimes you would have no chance of seeing 
>> someone coming from the side at 50mph until it was too late to take any 
>> avoiding action.
>
> Yes, but then you have the perfectly clear view of a person sitting in 
> your way - and you aim for them.

Even cars going at speeds like 20mph cover a distance like 5 metres (maybe 
the distance from being hidden to being in the middle of the intersection) 
in well under one second.  I suspect if you're going 50mph and you see a car 
crossing your path 0.5 seconds before you are about to hit it, there's not a 
lot you can do, cars don't turn very sharply at 50mph.

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