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the second number, and the corridor's second named route
For sixty years the road through Roseland carried two U.S. numbers. The second arrived with a named trail of its own: "The US 33 designation was established January 1, 1938; it and the Blue and Gray Trail were dedicated on May 2 of that year." Michigan's record agrees to the day — the US 33 designation was added to US 31 from the state line northward to St. Joseph on 1 January 1938. The Blue and Gray Trail was created in conjunction with US 33 in 1938 to promote a direct and scenic route between the Great Lakes and Virginia's historic Tidewater region; as US 33 it traversed Roseland on Dixie Way for the whole concurrency, 1938 to 1998, making it the corridor's second named-route layer after the Dixie Highway, older by far than any surviving shield. The concurrency ended in April 1998, by the same act that coined the road's present number.
Sources: U.S. Route 33 route history (the January 1, 1938 establishment and May 2, 1938 dedication, verbatim); Michigan Highways, U.S. 33 (the state-line concurrency, verbatim); the Blue and Gray Trail record.