After seperation from active military service in ‘69 I drove from NJ to CA. I picked up US-66 in, I think MO. At this time, they were still building I-40. So you would be on 66 for 15 or 20 miles,then be diverted back to I-40 for 15 miles or so an then diverted back to 66. This cycle repeated all the way to CA.
LOL! I remember that too. Except there was a lot less I-40 in ‘63 and a lot more RT 66.
Wow, and I thought Philly to St. Louis was a long drive. From St. Louis, I-44 follows the old Route 66 to Oklahoma City, where it intersects with I-40.