I agree with Nodaker. Except for a long construction section in the Yukon, the roads are overall as good--or sometimes better--than those down here. Some of the unpaved roads I took, like the Denali Highway and the Nabesna road, were pretty rough and I probably wouldn't take the Nabesna Rd without 4WD. The Denali Highway is doable but don't plan to go more than 10-15 mph if you want your tires to survive. Sharp rocks embedded in the dirt. The Taylor Highway has a lot of frost heaves. I had no tire issues and traveled more than 7K miles.
