Hmmm...I drove around Vegas once and didn't really notice the bad drivers...must have been a good day. But I did have to dodge a few tumbleweeds rolling across the freeway. And at times the air got thick with dust, mostly from the huge amount of homes being built (construction was kicking up dust). There's not a helluva lot of grass out there.
But I have to say that Vegas (like the rest of Nevada) has some very smooth freeways. No bumps, cracks, unneven surfaces or anything. I live in California (Bay Area), where all the freeways are in a perpetual state of decay. You gotta hold the steering wheel tight around here.