Yeah I could literally write pages.
On my way to work a few days ago was in a queue of traffic at temporary lights, I was 4th in the queue and an ambulance about 10 cars behind me lit up just as the lights changed - 2 of the cars in front of me went before they'd have really noticed it but the 3rd one really should have held back - as I stopped to let it through the person behind me went to go around me, then realised only after they'd started to manoeuvre and I noticed 3-4 cars in the queue did similar but actually half-way or more into the other side of the road before they realised why the person in front of them hadn't moved... then had to try and reverse out the way holding the ambulance up momentarily...
On the other hand a couple of weeks back while queued in heavy traffic at the end of the dual-carriageway that goes into the town I work in when an unmarked police car stuck their lights and siren on the whole queue made a lane down the middle as one perfectly in sync - I couldn't believe it.
It's quite scary how unaware people are. I was having a drive a few weeks ago and saw there was a police car coming about five cars back from me, started to slow a little and pull to the side of the road. Car behind me didn't realise what was happening even with the police car behind them with full lights and sirens for a good 30 seconds.