   Standard Highway markers for Ohio | |
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| Highway names | |
|---|---|
| Interstates | Interstate nn (I-nn) |
| US Highways | U.S. Route nn (US nn) |
| State | State Route nn (SR nn) |
| System links | |
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The Ohio Department of Transportation (ODOT) is responsible for the establishment and classification of a state highway network which includes interstate highways, U.S. highways, and state routes.[1] As with other states, U.S. and Interstate highways are classified as state routes in Ohio. There are no state routes which duplicate an existing U.S. or Interstate highway in Ohio.
Ohio distinguishes between "state routes", which are all the routes on ODOT's system, and "state highways", which are the roads on the state route system which ODOT maintains, i.e. those outside municipalities,[2] with a special provision for Interstate Highways.[3] Besides the state highway network, there are various county and township road networks within the state.
ODOT permits business routes but only "where an ODOT-maintained highway has been constructed on a new alignment which bypasses the CBD [central business district] of a municipality and no other ODOT-maintained highway provides a direct two-way connection between the bypass route and the CBD, or where the existing guide signing does not adequately direct the driver from the bypass route to the CBD and back to the bypass route."[4]
- ^ Ohio Revised Code 5501.11
- ^ ORC 4511.01(II),(JJ); ORC 5511.01
- ^ ORC 5521.01
- ^ "2 Signs: 204-3 Business Routes". Traffic Engineering Manual. Ohio Department of Transportation. July 19, 2024. Retrieved January 4, 2025.