History
US 25 originally extended northward into Ohio and Michigan before Interstate 75 between Cincinnati and Detroit, and Interstate 94 between Detroit and Port Huron, Michigan, made most of US 25 superfluous north of Cincinnati. In Michigan, M-25 continues as the designation of old US 25 between Port Huron and Port Austin. Some old maps disagree on whether the east–west segment of what is now M-25 between Bay City and Port Austin was US 25 or M-25; for that discussion see M-25.
Relics of US 25 between Brownstown Township, Michigan, (a suburb of Detroit) and Cygnet, Ohio, include US 24, M-125, and State Route 25.
US 25 in Michigan and Ohio was historically known as Dixie Highway, and the road is still so named in some places. It may also be known as "County Road 25-A" through some parts of Ohio.
Until 1996 when the Cumberland Gap Tunnel was opened to traffic, from Middlesboro, Kentucky, US 25E climbed the Cumberland Mountains and along the historic Wilderness Road, passed through the Cumberland Gap into Virginia then heading south to enter Tennessee.
Old US 25 north of the intersection of US 11W in Tennessee crossed over Clinch Mountain, following a notorious route consisting of considerable elevation gain and many switchbacks, some of which were full hairpin turns.
Read more about this topic: U.S. Route 25
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“The history of our era is the nauseating and repulsive history of the crucifixion of the procreative body for the glorification of the spirit.”
—D.H. (David Herbert)