To me the solution to that is obvious and far better than the current status quo. The cars are all attached to a network and when an emergency service vehicle needs to get somewhere in a hurry there is a coordinated effort to move vehicles off the required route.
As things stand emergency vehicles have to cope with a reasonable minority of people who completely panic and actually impede their progress.
This has to work even if network reception is weak or absent. You can't be certain that 100% of cars will receive the signal and get themselves out of the way in time.
As things stand emergency vehicles have to cope with a reasonable minority of people who completely panic and actually impede their progress.