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I-80 was constructed as part of the Ohio Turnpike (with the exception of modern I-76 and I-480), the origins of which predate the establishment of the Interstate Highway System in 1956. The Ohio General Assembly created the Ohio Turnpike Commission in 1949, which was the first step in designing and constructing the east–west freeway.
The road miles of these 21 Interstates add up to a total of 1,572.35 miles (2,530.45 km). Ohio has more route miles than this, most of which comes from I-80 running concurrently with I-90 for 142.80 miles (229.81 km). The Interstate Highways in Ohio range in length from I-71, at 248.15 miles (399.36 km), all the way down to I-471, at 0.73 miles ...
The postmile markers indicate the distance a route travels through individual counties, as opposed to mile markers that indicate the distance travelled through a state. Multiple other states, including Nevada, Ohio, and Tennessee, use similar county-based mile markers on non-interstates, but use standard mileposts on interstate routes.
Ohio State Highway System; Interstate; US; State; ... Marker design used in Ohio since 1971 ... 134.80: 216.94 US 27 in Oxford:
Most of the turnpike, 218.7 miles (352.0 km) between the Indiana border and an interchange with Interstate 76 (I-76) near Youngstown, is signed as part of I-80, while the eastern 22.6 miles (36.4 km), between the I-80/I-76 interchange and the Pennsylvania border, is signed as part of I-76.
Interstate 295 was the first highway in Rhode Island to receive mile-based exit numbers, starting in November 2017. Mile-based exit numbers have been added to Route 146 as part of a sign replacement project. Conversion completed in November 2022, with I-95 the last remaining highway in the state. Texas: Late 1970s.
Interstate Highways: A list of interstate highways within Ohio. U.S. Routes: A list of U.S. highways within Ohio. State Routes: A list of all state routes within Ohio. County roads: An overview of the county roads in Ohio Ohio Turnpike: A toll road carrying Interstate 90, Interstate 80, and Interstate 76.
On one- or two-digit Interstates, the mile marker numbering almost always begins at the southern or western state line. If an Interstate originates within a state, the numbering begins from the location where the road begins in the south or west. As with all guidelines for Interstate routes, however, numerous exceptions exist.