Waymo Launched a Revealing Postmortem on Its San Francisco Blackout Meltdown

A postmortem from Waymo on Tuesday is providing not less than some readability about what the hell occurred to its poor, benighted San Francisco operation after a lot of the ability throughout town went out on Saturday.

Waymo conduct at darkish stoplights pressured the Alphabet-owned firm to name all its San Francisco robotaxis again house, a logistical disaster. However in equity, social media posts in all probability made Waymo’s ad-hoc resolution look much more haphazard than it really was, giving the impression that each one the Waymos in San Francisco had been zapped on the similar time by no matter triggered the outage, inflicting them to halt in place, together with in busy intersections, as if their robotic drivers had been raptured to robo-heaven.

Energy outage took out the waymos RIP pic.twitter.com/DPte8oOGku

— Vincent Woo (@fulligin) December 21, 2025

There were certainly choked streets and blocked intersections, however beneath is how Waymo prefers to border the way in which the issue arose. Word that in its comms, Waymo refers back to the self-driving software program in its automobiles as “the Waymo Driver.”

“Whereas the Waymo Driver is designed to deal with darkish site visitors indicators as four-way stops, it could often request a affirmation verify to make sure it makes the most secure alternative. Whereas we efficiently traversed greater than 7,000 darkish indicators on Saturday, the outage created a concentrated spike in these requests. This created a backlog that, in some circumstances, led to response delays contributing to congestion on already-overwhelmed streets.”

It appears crucial to Waymo’s model to not ever enable the impression that Waymos are ever remotely pushed. What Waymo has as a substitute of “distant drivers” or “teleoperators” is named “fleet response,” a Waymo weblog put up says. When the Waymo Driver encounters a really heterogeneous driving state of affairs, it sends out for human suggestions, which we’re not supposed to think about as a bailout. It’d need affirmation about, say, what it suspects is a very impassable intersection, and a human operator sends again indicators directing it the place it’d need to go.

“Fleet response can affect the Waymo Driver’s path, whether or not not directly by means of indicating lane closures, explicitly requesting the AV use a specific lane, or, in probably the most complicated eventualities, explicitly proposing a path for the car to contemplate,” the Waymo weblog put up about Fleet Response says. You may or won’t contemplate this the enter of a “distant driver” or a “teleoperator.” Waymo clearly doesn’t.

At any charge, all these furtive Waymos at blacked-out stoplights in San Francisco on Saturday created a logjam of those requests for human suggestions, and Waymo’s postmortem acknowledges that the logjam triggered even worse site visitors.

So what Waymo says occurred subsequent looks as if an inexpensive plan of action in response to inflicting site visitors throughout a blackout: “We directed our fleet to drag over and park appropriately so we may return automobiles to our depots in waves. This ensured we didn’t additional add to the congestion or hinder emergency automobiles throughout the peak of the restoration effort.”

From the skin, and particularly on social media, that is the half that regarded worse than it actually was. Posts exhibiting Waymos in intersections might be seen subsequent to posts exhibiting Waymos stopped together with the highway. This made it appear to be San Francisco was a post-apocalypic wasteland strewn with useless robotaxis. It’s affordable to ask: in the event that they weren’t useless, why didn’t the corporate ship them house? But it surely’s additionally affordable for Waymo to need to keep away from a vital mass of Waymos disrupting San Francisco like a herd of stampeding Wildebeasts, and thus making the automobiles simply wait on the facet of the highway till their group is named.

This created an additional unhealthy search for Waymo: alongside the Waymos that did change into obstructions, there have been not less than some crowds of safely parked Waymos, not glitching out, however merely ready for the sign to return to their depots in an orderly trend.

6 Waymo’s parked at a damaged site visitors gentle blocking the roads. Looks as if they weren’t skilled for an influence outage pic.twitter.com/9fBkoxgKwe

— Walden (@walden_yan) December 21, 2025

There are not any future plans talked about within the postmortem about introducing distant drivers. What future plans are included, moderately puzzlingly, don’t embrace something—not less than to date—about altering the Waymo Driver’s elementary driving software program in any respect. The three bullets about Waymo’s “path ahead” all give attention to emergencies: “Integrating extra details about outages,” “Updating our emergency preparedness and response,” and “Increasing our first responder engagement.”

Robotaxis are programmed to drive conservatively, and thus have boy scout-like conduct information in combination, however this postmortem doesn’t present Waymo reflecting in any respect about the truth that these are aliens on our roads who will misbehave and fail in completely novel methods that may’t be predicted. Actually, it ends on a notice of defiance, saying “we’re undaunted by the chance to problem the established order of our roads, and we’re proud to proceed serving San Franciscan residents and guests.”