Chris
Handheld's rarely used (usually only on the edge of town to get you as you speed-up too soon to get out of them) - BUT they do have big grey boxes on the side of the road, always signposted so you're blind if you miss the signage, they stand 5' tall and 3'x2' and always work!! You and others have been warned. The police however do not go out of their way to hunt motorcyclists down, in fact they do like to chase after speeding car drivers who usually turn out to be immigrants from ex Yugoslavia and have no licence or insurance. So for the ske of my own safety I support their actions. Ride professionally and look for the signs and you'll not be bothered.
Monty
The Austrians are very very keen re speeding, and now almost every village in every remote valley has some form of radar or a local plod keen to raise income for his or her village - so be warned all. For us lot with swiss number plates should we get caught in Austrian and we are doing over 30kph above the set limit, then we have to walk home. Yes they impound our transport. You have to arrange for someone else to collect it. You're licence is taken off ya and a ban is automatic. It's a reciprocal agreement and applies in Italy and Germany too. There is talk that the French will join the scheme. For me the good thing is that when I'm riding in the UK I do not have to worry about Gatso's - no such agreement exists between UK and CH