>> Their interventions are automatic when the car calls back to home base to make a determination as to what to do next and the operator makes a choice on how to proceed. Happens about once every half an hour travelling on Waymo in SF for me.

> How do you know when a Waymo vehicle is receiving guidance from remote support?

If it calls back for guidance like that, I'm sure there'd have to be a noticeable delay where the car stops and waits for a response. It's going to take at least 10-30s for a human to context switch into the car's situation and input the guidance, probably longer.

To get a faster response from a human, the human would have to be continuously engaged with the car's driving task.

The car tells you verbally and shows you on the screen that it is calling back to base to ask for assistance "to get you moving again".