BUT:
Emergency vehicles should be hooked in to a crowd-sourced traffic system now. The first thing they should do is hit a big button on their dashboard that says “Road Closed”, “lane blocked” etc which should then update Google maps etc and also disable things like autopilot for vehicles approaching the incident.
This goes for things like roadworks too.
A bit like Waze but the information comes from “official” sources and is required by law to be logged.
Our police aren't organized at a national level in the USA: its a collection of 10,000+ departments, some of which are incredibly shallow (say 1 sheriff elected by the locals and 5 deputies).
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To practically start something like that, you find police departments that are likely to agree with each other (ex: NYPD + Boston PD), and then maybe get an agreement between their Commissioners. You grow the alliance one step at a time. You're gonna have to figure out "why would the police want a system like this in their procedures?", such as arguing for a mitigation of accidents or whatever. Or maybe giving the police some kind of power (ex: official announcement to close a road and redirect traffic)
If the goal is really to make cars that can drive as well as humans, they need to be able to do that based only on on-board sensors.
100% the driver's fault.