The cars relying on external routing guidance, from cloud services similar to 'Google Maps' driving directions. An alert from emergency services can simply... r

The cars relying on external routing guidance, from cloud services similar to 'Google Maps' driving directions. An alert from emergency services can simply... remove roads from consideration, the same as is already routinely done when other accidents/traffic cause dynamic routing updates. So, you don't even need to upgrade the autonomous vehicles, you just change the other, existing, flexible, proven system for recommending routes.