The roads in Arizona and Utah vary from huge freeways to dirt tracks that are passable only with specialized 4-wheel-drive vehicles. This isn't the worst road I have ever driven, but it is a good idea of what they mean when they say, "Primative Road, 4 Wheel Drive Recommended." I could not have made it up this hill in my 2 wheel drive truck, maybe. But it would have been a close call. Here the problem is the mixture of loose sand and large rocks in the road.