[manmal]

OTOH, a limit of 70mph might be too high for my granny. And 100mph is a joke for somebody with racing experience. Who do you design for? You are very responsible and everybody should behave like you; but what if you get diminishing safety returns when driving lower than 90mph because your reflexes are good enough? Should you get fined for driving 90 then, and my granny (who can barely handle city traffic) is not fined for driving 70 while endangering other people?

Edit: Forgot to add my favorite solution: Add a very high, hard speed limit (130mph?) on all streets, and let traffic signs serve as recommendations. Obviously, also limit to walking speed in neighborhoods where kids play in the streets, or city centers.

[jl6]

I hear a lot of people claim they are such good drivers they should be allowed to drive faster.

I don't trust their self-evaluation of their own skills.

[adrianN]

If your granny can't handle driving the speed limit, maybe she should hand in her driver's license.

[foldr]

> And 100mph is a joke for somebody with racing experience.

Racing is dangerous and the people who do it know that they're taking a risk. It's not appropriate to take that risk when driving on a road.