[darth_avocado]

Firemen have access keys to various things. You could have a Waymo device for the same that similarly facilitates an override. Or at the very least provides a line with a manual operator that can override on the Waymo side.

[mr_toad]

As far as I know the driverless operators already have manual operators that can be contacted by emergency services. In some cases there seem to be human communication failures on top of the driverless failures.