Automobile was wrong but the policeman made a bone headed mistake. Never, never put yourself in a position where you have no avenue of escape. You will get plenty of those without initiating them yourself.
I've never seen police block a lane on an expressway to allow an ambulance to merge. Anytime you start compressing two lanes into one you can expect problems even when you have merg warning signs hundreds of feet in advance. The officer pulled right out in front of a truck when it showed no inclination to pull over. The truck was very slow to react and pull over and only one car in the lane behind the truck moved to the other lane. There were three cars lined up on a collision course with the motorcop. Really, how much time did the yellow car really have to see the cop and process the fact that he wasn't moving. Not sure hi-viz had any bearing on the outcome.
