The viability of door-to-door level 4 depends on which two doors you're talking about. Chris Urmson, the lead engineer will tell you that cross country, all wea

The viability of door-to-door level 4 depends on which two doors you're talking about. Chris Urmson, the lead engineer will tell you that cross country, all weather level 4 might be 30 years out, but their Koala cars would be doing publicly accessible trials around Mountain View right now if it weren't for regulatory hang-ups.