It may not be, but it seems to me that (depending on what manner of sensing is used) that poorly marked or maintained roads could be a limiting factor - but that's not the only issue. Personally, and you'd know better than i would, i can't imagine an automated truck navigating a major city (for example) - not because of road condition, but because of lack of markings (in some case) or other drivers. While potholes are a concern, there's a lot of other variables that need to be addressed - again, my opinion.