The details of these companies' “remote assistance” programs are important because the humans supporting the robots are critical in ensuring the cars are driving safely on public roads, industry experts say. Even robotaxis that run smoothly most of the time get into situations that their self-driving systems find perplexing. See, for example, a December power outage in San Francisco that killed stop lights around the city, stranding confused Waymos in several intersections. Or the ongoing government probes into several instances of these cars illegally blowing past stopped school buses unloading students in Austin, Texas. (The latter led Waymo to issue a software recall.) When this happens, humans get the cars out of the jam by directing or “advising” them from afar.