[struppi]

IIRC, in Austria, police CAN ask you about your name and home address at any time, and they can even bring you to the police office if they don't believe you and you don't have an ID to prove it. Even though we don't have an "Ausweispflicht" like Germany, having an ID with you can be a good thing in this situation.

They are not allowed to search you without a reason (In theory. I heared that they might just say "I think I smelled cannabis" and then they have a reason.)

Disclaimer: IANAL, and maybe I got some details wrong.

[chefkoch]

"Ausweispflicht" in Germany only means you have to own an id card or passport, not that you must carry it all the time.

[maze-le]

Yes, that is true. Interestingly most Germans I know don't even know that, and think everyone has to carry an ID with them. This is really a common misconception.

[Cthulhu_]

IIRC in the Netherlands they introduced an ID carrying requirement for anyone over the age of 17 or thereabouts. Makes things less complicated in case of having to check your age when buying alcohol, or when you get pulled over for whatever reason, or even when you get into an accident and need to be identified.