Enforce the mobile telephone legislation and tighten up on the appalling driving standards of some.
Before you all shout foul, go out an pick up the pieces after an RTA, then shout foul if you still think this is draconian.
The problem is that the punishment depends upon the outcome, and not the offence.
For the many thousands that routinely get away with speeding, drink driving or mobile use, an unlucky few hundred might get a fine and penalty points, or in the case of drink driving, a ban. One or two out of this number might cause an accident, or even kill someone. They might be vilified and get 10 years in prison, but the initial offence that caused, or contributed to, that terrible outcome is exactly the same offence committed by the hundreds that get fines.
It might sound extreme, but if people thought that drink driving, using a mobile, or even speeding, would result in a prison stretch, how many would risk it?
All a bit off topic, but anything that can reduce the scope for human error, including autonomous vehicles, has to be a good thing. Of course, they would have to be proven to be at least as safe as a human driver, and that should be entirely possible.