The fact that the speed limit is much lower I think backs up that Cruise's permit is actually less permissive, and is most likely for at-night only. Waymo has

The fact that the speed limit is much lower I think backs up that Cruise's permit is actually less permissive, and is most likely for at-night only. Waymo has had driver-free cars in Phoenix for over a year, so it would be strange for Cruise (who doesn't have a driver-free robo-taxi service already) to get a more permissive permit than Waymo.