Emergency vehicles... I worked on a 911 response ambulance in San Francisco for close to four years before an accident ended my career when I was driving to a call. I was driving code 2 (no lights or sirens). Code 3 is lights and sirens.
An ambulance is a big giant box with crap visibility and handling.
I absolutely HATED driving code 3. It is a very dangerous thing to do. A LOT of people just don't see or hear that big giant box, you'd be surprised how many don't see...