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In 1935 the Ohio General Assembly passed a law which added 5,000 miles of roads to the state highway system over a 12-month period. [7] [8] These roads were assigned route numbers in the 500s, 600s, and 700s. [9] In 1962 certain numbers were retired to accommodate numbers in the Interstate Highway System. [citation needed]
The Ohio Department of Transportation currently operates the seventh-largest highway system in the United States [33] and the sixth-largest interstate system measured by total lane-miles. [34] These highways support the fifth-greatest traffic volume by total vehicle miles, [ 35 ] the third-greatest value of commercial freight, and contain the ...
The American Association of State Highway Officials would publish the first national Manual and Specifications for the Manufacture, Display, and Erection of U.S. Standard Road Markers and Signs over two years later. In July 1934, Ohio's manual was expanded and renamed to the Manual of Standard Signs, Markers, and Pavement Marking.
U.S. Routes in Ohio are the components of the United States Numbered Highway System that are located in the U.S. state of Ohio. They are owned by the state, and maintained by the Ohio Department of Transportation (ODOT) except in cities.
Loar Highway in Amboy Township: 1923: current SR 65: 115.84: 186.43 SR 47 in Salem Township: I-280 in Toledo: 1923: current SR 66: 118.60: 190.87 US 36 in Piqua: US 20 in Fayette: 1923: current SR 67: 84.78: 136.44 US 33 in Wapakoneta: SR 18/SR 19 in Republic: 1923: current SR 68 — — Union City: Waldo 1923: 1932 SR 69
This was done to coincide with the coming of the Interstate Highway System to Ohio, which included Interstate 680 (I-680) in the Youngstown area. Ohio follows a standard that no numerical designation may be duplicated among Interstate, U.S. and Ohio state routes, so to avoid a conflict, SR 680 was re-numbered as SR 681. [3] [4]
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 (1.17 km). [2] As of 2019, out of all the states, Ohio has the fifth-largest Interstate Highway System. [4] Ohio also has the fifth-largest traffic volume and the third-largest quantity of truck traffic.
County roads in Ohio comprise 29,088 center line miles (46,813 km), making up 24% of the state's public roadways as of April 2015. [2] Ohio state law delegates the maintenance and designation of these county roads to the boards of commissioners and highway departments of its 88 counties. [3]