yeah many ppl panic when confronted by cops or ambulance with horns and light blasting.
I have been working on ferries for a while, and as soon as some one have driven ther car on bord a ferry it is like they instantly forget how to drive and Loose every Little bit of common sense they might have.
Some / most ppl pull over and stop when they hear a ambulance, but i have often seen this mean that the ambulance is caught out behind 4 lanes of stopped traffic at a intersection, and nobody react they just remain stopped, so in the end the ambulance have to jump a high curb to use bicyclepath or sidewalk.