One of the exhibitors told me that in his state, colourblind people were not allowed to hold a commercial driving license 'which is part of the reason we have the safest roads in the world'.
That I assume was tongue in cheek
Of course the more people you take off the roads, colour blind or not, the fewer accidents you have
If you suddenly banned from the road anyone who had a clearn driving record for the past 10 years (out giving them a chance to go out an deliberatly crash) the roads would be a much safer place
Fewer cars=safer roads.
Not that such a policy is in any way sensible!