I thought I'd put this here - I drove 10 Km through Austria Saturday from Bregenz through the tunnel into Germany. I "forgot" that you need a Vignet for the Austrian highways. They don't sell them at the borders (unlike the nice Swiss guys) so it's easy to forget. There was a traffic police road block just before the German border, about half of all cars were pulled over for not having the sticker and fined €120! Half of those pulled over were Austrian plated cars which was pretty surprising so I guess these road blocks are pretty infrequent. But you have been warned, it was the most expensive 10 km I've driven

Cost BTW is €70 odd for a year but you can also buy an 8 day one for about €10 I think