We didn't use any of the old Route 66. I-40 is what replaced it, we used that and two lanes state routes.A little off subject, what I heard a few years ago was bandits were jacking old muscle cars on Route 66. They would drive next to a car and inform the driver that they have a tire going low and they would pull over and offer assistance… pull out a piece and drive off with their ride! Nice…real nice try explaining this to your insurance company. 🤯
On the Rocky Mountain Race Week FB page one or two of the routes are posted. They have Road Week where you can experience the event for a smaller entry fee and follow the same route we do.