I have a recent story about this very topic.
I pulled into the left turn lane at a fairly busy street (2 lanes each side). While I was the only person in the turn lane, the other two lanes next to me were backed up quite a bit waiting for the red light to change. Meanwhile, I see an ambulance quite a ways back from me and headed for the turn lane. The legal thing for me to do is pull to the right, to get the hell out of his way. Well, I quickly check for oncoming traffic and I pull out of the turn lane in front of the guy next to me (on the right) and stop. Of course, at that very moment, the damn lights change and the a@@hat I'm parked in front of starts blaring his horn. I'm guessing he didn't have a clue that the ambulance was even there since he clammed up like a moron when it went tearing by us using the the hole I opened up. People need to be more aware of emergency vehicles, and get the hell out of the way. I'm sure he felt smart.