Waymo's map data is a prior, not an authoritative reference to the world. The cars report update when the map data is wrong, and a lot of what they use it for (

Waymo's map data is a prior, not an authoritative reference to the world. The cars report update when the map data is wrong, and a lot of what they use it for (e.g. traffic light identification, fine localization) degrades gracefully when there's new information in the environment.