Just the other night I was driving our ambulance, brand new with bright new LEDs all over, at midnight going through an intersection with my sirens on and a car still decided to go 3/4 of the way through the intersection before stopping. He started stopped at a red light that changed to green, all the while clearly able to see me coming. I also routinely see pedestrians run across the road during the day, trying to get across before I get to them. Not that it excuses anything, because as a driver, being aware is the most crucial part, but other people just don't know how to react to emergency vehicles.