Comment by rob74

To me it looks like it's a problem with the "default attitude" (can't think of a better name) of the Waymo driving software. When a human sees that the road surface ahead is in some unknown condition (flooded, covered in lava, whatever) they usually default to caution - better stop and check first. While Waymo apparently defaults to blithely driving ahead, after all its maps tell it that there's a road ahead and it didn't detect any known obstacle, so what could possibly go wrong?