Every major city has construction zones. Right now this is a no-go for self-driving cars.

And lots of this stuff is reactive or generated on the spot and the city will have no knowledge of it.

OTOH, even if it becomes a safety non-issue, advance knowledge of construction, 911 responses in progress, and other events on the potential routes can be useful to route planning in computer navigation systems whether or not they are used in self-driving vehicles.

As with detailed maps, other types of information would probably improve the overall safety and reliability of an autonomous vehicle. But, at some level, it needs to be able to drive on its own based on the environment it can directly sense.

Bureaucracy and public safety are mis-aligned to the point where a service relying on bureaucracy with a direct impact on public safety is going to be an uphill battle.

It also comes with some very interesting liability issues, such as: if the input data to that service is faulty and you then broadcast it to a bunch of AVs which react to it leading to an accident where would you assign blame?