Anybody on the ground confirm if it was the traffic lights or lack of cellular that cussed the stoppages?

I saw plenty of Waymos managing to make it through intersections. They were slow and tentative, but definitely made forward progress.

I think the emergency "phone home" protocol requires a phone, presumably with enough channel capacity for reasonable video feeds. I wouldn't be surprised if the dead in the road Waymos were lacking connectivity.

There is of course also a possibility that the total demand exceeded the number of people at Waymos available for human intervention.

I think it’s clear that both use cases are a must have during an emergency. Even more, rescue services and stranded people would need all the bandwidth and reception they can get, Waymos shouldn’t be online during such times at all.

First responders get the highest priority of cellular networks even in non-emergency situations (FirstNet).

FirstNet is AT&T. Verizon and T-Mobile have their own alternatives (FrontLine and T-Priority, respectively). QCI is a fun rabbit hole, because some of these networks share the first responder QCIs with certain business use cases.

I didn’t notice a lack of cellular. Though it did get down to like 6Mbps, which was certainly degraded service.

I was in the affected area and we effectively lost all but messaging. Not the whole time, but definitely while I was ordering takeout at a place with power. I couldn't get an image to send to a friend.

I lost cell during the whole outage on Verizon, came back immediately when power was restored. There seemed to be some towers up, if i walked down the street I could find one, but plenty were down.