Interstate 75 runs 1,786 miles from Miami, Florida to Sault Ste. Marie, Michigan at the Canadian border, making it the longest north-south interstate east of the Mississippi. It serves the Florida population centers, the Atlanta industrial belt, and the Cincinnati, Toledo, and Detroit auto-manufacturing corridor before terminating at the International Bridge into Ontario.
For freight, I-75 is the main freight route for the southeastern automotive supply chain and the main route for Florida-bound produce, snowbird traffic, and Detroit-Florida finished-vehicle moves. The Atlanta segment, especially through downtown and along the I-285 outerbelt, is among the most congested in the country. The Cincinnati Brent Spence Bridge over the Ohio River is a chronic chokepoint that has driven a major federally-funded replacement project.
Geographically I-75 is mostly rolling, with the only significant climbs through the Cumberland Plateau in northern Tennessee and Kentucky, and the moderate Appalachian foothills in northern Georgia. Weather hazards are dominated by Florida summer thunderstorms, lake-effect snow in northern Ohio and Michigan, and occasional ice events in the central segment.
- Longest north-south interstate east of the Mississippi
- Second-longest north-south interstate in the US, after I-95 (Wikipedia)
- Crosses six states: FL, GA, TN, KY, OH, MI
- Main snowbird and produce corridor between Detroit and Florida
- Atlanta segment ranks among the nation's worst truck bottlenecks (I-75 at I-285 North, 5th nationally; ATRI 2026)
- Brent Spence Bridge at Cincinnati is a federally-funded replacement priority
- Concurrent with I-85 from Atlanta north to the South Carolina line
- Reaches the Canadian border at Sault Ste. Marie, MI