This is something I can confirm firsthand: riding my motorcycle on a motorway when suddenly a car appears in the wrong direction, ie on your portion of the motorway instead of the other one. It's not like in the movies when the bad guys are chasing the good guys, and then they drive up the motorway into the upcoming cars, avoiding each one. No, it usually ends up in a drama. Often the drivers who took the wrong part of the motorway were distracted, drunk and/or too feeble-minded. In my case the car thought he was driving in the slow lane, which of course is the fast lane in the right direction, and luckily I was riding on the far right - the real slow lane. So it avoided me and kept going despite all upcoming cars flashing their lights. I don't know how it ended, but it's frightening.
Scene of movie The Matrix Reloaded
Anyway, this is something that happens all over the world, and in Switzerland they have decided to try something else. The organization that deals with the roads and infrastructure, OFROU , has installed radars that will detect if a car is going to wrong way. It then sends messages to electronic message/billboards hoping to get the driver's attention, and warn upcoming cars of the danger. It also automatically notifies the police so they can try to stop the driver.
At this moment it's an experiment, and if it works out, more of these radars will find their way to the Swiss motorways.
When I read this, it also means that they need to install two-side electronic message panels on the motorway...
Via: Le Repaire Des Motards