 State Route 66, from east of Dryden Pennington Gap, was renumbered as part of State Route 70, and State Route 66 was used on former State Route 70 from Banners Corner to Pattonsville, and State Route 65, from Dot to Kentucky to match Kentucky Route 66.State Route 67 was renumbered as State Route 160 to match Kentucky Route 160, and State Route 67 was used on former State Route 83.State Route 70 was renumbered as State Route 66, from Pattonsville to Banners Corner and as State Route 64 from Banners Corner to Fremont, and State Route 70 was used on former State Route 64 from St. Paul to east of Dryden, State Route 66 from east of Dryden to Pennington Gap, and State Route 64 from Pennington Gap to Tennessee to match Tennessee State Route 70.