Previous TN 27A's:
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TN 27A: Appeared in the Official Route log between 1957-60 as the north approach to the Olgiati Bridge in Chattanooga, which opened in December 1959.
In 1963 or 1964, TN 27A was changed to TN 27 Spur. Today it is US 27/TN 29.
Some of the bridges north of the river are dated 1955, so it is possible a small part of this opened before the Olgiati Bridge itself opened.
I have not yet found a map that shows this as 27A but it is explicitly in the 1960 and 1962 Official route logs.
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