my (completely uninformed) understanding was that level 3 was more like "level 4 in perfect conditions". So it would need to pull over, or warn the driver to ta

my (completely uninformed) understanding was that level 3 was more like "level 4 in perfect conditions". So it would need to pull over, or warn the driver to take over if it starts raining or snowing or the road (or it's lines) is uneven or ill-defined. Or perhaps that it's 100% self driving in all conditions on a highway, but still needs manual driving for "surface roads". Many of those scenarios would allow some time for the driver to take over, and would most likely be able to pull over if the driver can't or won't for some reason.