I've seen cars pulled over by unmarked police cars a couple of times on the motorway to Bern and also the motorway to Chur (from Zuerich).

I also got pulled myself by an unmarked car, the first day I bought my car because I didn't have the new numberplate mounted on the front (hadn't got the proper mounting plate). Luckily the police were tolerant but warned if I let it go a few more days I'd be fined if caught. And I keep getting pulled all over the place on those side of the road random license/registration/tires checks - from Lenzerheide, through Zuerich to Canton Aargau a couple of times. The Aargau police do lots of checks - apparently there's a police traffic training college there or maybe they're just trying to do something about the cr*p drivers :-).

Despite all the stops (3 in a month once, but nothing for the last 12 months, thankfully) I've never been asked to do a breath test.


Gav