I just went up 285 from Fort Stockton and then through Pecos to Carlsbad. Particularly around the Pecos area it was a mess due to the oil field traffic and road construction.
Hwy 90 and 54 are good roads. We have taken 54 from Van Horn to Carlsbad several times. There will be a sharp incline when you get close to the park, other that that it is a good road.