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| TN 20A renumbered | |||||
| Previous TN 20A's:
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TN 20A #1: implied to go back as far as the late 1920s as a direct numbering of TN 6 from TN 20 Summertown southeast to the new US 43/TN 6 alignment. Doesn't appear on route logs but is shown as primary on many maps over the years.
In 1983, TN 20A was renumbered as part of TN 240. County maps at least implied 20A existed.
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