In Canada, our driving tests are reasonably stringent (it's uncommon to pass the first time), but you only have to pass once and the police rarely enforce traffic law. The result is that people are great drivers until they get their license, and then quickly turn into morons and just drive like everyone else.

Mandatory retesting might help, though if there's still no enforcement, we'll just get drivers who are good a taking the test, but not driving.

This effect should also be noticeable across states in the USA. Is it?