AMP: 200 Location: Santa Fe Ave and Route 66, Flagstaff Just after 89, we’ll approach Historic 66. Turn left for 66 east and stay straight for 66 west. 66 east is technically I-40 Business too, but it’s signed as Route 66 to prevent confusion, since we’re already on I-40 Business. AMP: 200 Location: Santa Fe … Continue reading U.S. Route 180, US-89 to I-40 Bus