A fair amount of it is two-lanes, not four. But it is a pretty good road. It is our route of choice from Tucson/Casa Grande/Phoenix, etc. to Las Vegas. We've done it several times. I think it is actually going to become a new Interstate route perhaps all the way from Vegas to Phoenix, but maybe not in my lifetime. There are a number of signs posted hinting to that effect. Clint is right. You shouldn't have any problems to speak of. Safe travels!
Jim & Angie, Boise, ID
2006 Monaco Dynasty Countess III
2017 GMC Acadia Denali