Its been a couple of years, but we drove the section through New Mexico and Arizona from Amarillo, TX a number of times and it was always in good condition. Our preferred route in that area is US-60, but it is a lot of two lane and takes you through the mountains of New Mexico and Eastern Arizona. I-40 around Oklahoma City was bad the two times we drove that section. We drove from Memphis to Knoxville on I-40 last Spring and I don't remember anything that bad, but we always avoid rush hour around the larger cities. As another poster stated, if you travel the interstates, your likely to run into bad sections and construction somewhere.
