Across the border in San Diego, the abundant green vegetation and lack of litter stands out in sharp contrast to the barren hillsides around Tijuana. I am amazed at the smoothness of the U.S. freeways and vow to never again complain about a "rough" road in the U.S. By my revised standard, there are NO rough roads in the U.S. For miles at I stretch I search along the highways for litter, and rarely see any. A final days drive and I'm back in Colorado. After driving for over 5,000 miles through the Western U.S. and Mexico, I realize that the most beautiful sight I have seen on this entire trip is my home -Colorado!