I got stopped a few weeks ago (in the UK), blues and twos on and indicators to pull into a layby (sp?), got asked to step out of the car, breathalised, had the number plates run, a look in all the windows, checked my tyres, had a few questions asked of me, "travelling alone? where've you been? this your car?" e.t.c which lasted at most 5 minutes and then I was free to go, I don't recall ever been asked for my driving license.KS responded but I'll say this anyway, because I think several people aren't quite on the same page with the terminology.
In general when most US posters are talking about "traffic stops" it's the situation where you're driving along, minding your own business and a police car pulls in behind you, turns on the lights and you pull over to the side of the road.
Personally, I don't have an issue with DUI checkpoints and the like, provided that they're being employed in a manner that isn't just a waste of resources. But that's a policy issue more than a legal one.
Now arbitrary, random traffic stops (lights on, pull over) just because the officer felt like checking you out is something else, and I think what some of the US posters (but not all) are taking issue with.
To be fair I was driving home from a notoriously drug infested town at 1 a.m. but it didn't bother me that much, although the look on the coppers face when I answered no to whether it was my car was priceless, I then added it was my parents after a short pause.