British Columbia

In theory, this should be true. But here in Japan we have a state-of-the-art public transportation system that is very cheap and easy to use and is often faster than trying to drive somewhere, but it has not curtailed drunk/elderly driving accidents.

I think the competing element is that those people most likely to cause an accident don't want to give up their personal freedom to be in control of the vehicle they're in, even if they lack the ability to control it safely.