Hit them in the pocket book
There are only a couple ways to deal with ''idiot'' drivers.
1)You could place the spikes in the road to reck their tires when the go the wrong way, but this is a hazard, liability and expence.
2) Or you can get them ticketed occasional for disobeying the laws. (And impound their car if they don't pay). Usually, people don't repeat a bad behavior as often if it starts to get expensive for them. And word of mouth about the tickets will reduce copycat behavior.
(The trick is to get someone authorised to ticket into the area at the right time - and figuring out how to fund the salary).
By R W Pasadena CA