[speeder]

Traffic is generally moving at 75-80 on the interstate anywhere in the west, sometimes a little faster in remote places. I'm about to do the Los Angeles to MN. drive that I've done countless times and the half that is between here and Denver is beautiful. The second half, (or first half going the other way), is obviously less exciting but still ok, eastern CO. is truly ugly but I've grown to actually like Nebraska, it's not so bad. Lots of farm land and sort of big small towns, nice people who are the salt of the earth. Iowa and the rest of the of the midwest is very green and pretty this time of year but the west is spectacular. Between the middle of the country and the east coast is kind of bland with scattered exceptions.

Mr. Gogar's advice is on the money, if you want to see Mt. Rushmore and the Black Hills, it will add some hours but worth it at least once, IMO. It sounds like you have a pretty leisurely timeline. Enjoy and be safe!