Have travelled route 50 last year, you will find out west most of the two lane roads are 60 to 65 mph
because there ain't much out there. Hit a route 10 in Kansas to Colorado for 85 miles.
There was absolutely nothing for those 85 miles. I was so glad that gas was not a problem
because I had gases up just before hitting it. The speed limit on this two lane road was 65.