I'd get on interstate 10 before you leave New Mexico . Interstate 40 is way too high elevation to risk this time of the year. There will be snow and the elevation doesn't drop to a no slow level until you come over the hill to LA. The 10 will be warm and balmy in comparison. The 8 would be even better. It's very low elevation the entire way.
Domromer screwed with this post 12-29-2012 at 05:20 AM