**In Ohio the maximum speed limit posted on highways is 70 mph (113 km/h) on the Ohio Turnpike, Rural Freeways, and both the Expressway and Freeway portions of US 30 from Mansfield, Ohio to the Indiana State Line and US 33 from Wapakoneta to St. Mary’s Ohio. The maximum speed limit ranges from 55 mph (89 km/h) to 70 mph (113 km/h) on other divided highways. No non-divided highway in the state has a speed limit higher than 55 mph (89 km/h).**

Ohio is the only state east of the Mississippi River to allow a 70 mph speed limit on non freeway roads.

Ohio has an urban speed limit of 65 mph (105 km/h) on Interstates by state law, yet many urban areas have lower speed limits due to safety concerns found in speed studies. These commonly are in the 50–60 mph (80–97 km/h) range. For instance, in most of metro Dayton and Cincinnati, as well as in downtown Columbus, the speed limit is 55 mph (89 km/h), while in Cleveland, Toledo, and Akron the speed limit is 60 mph (97 km/h). However, in central Cleveland along the Inner Belt, the speed limit is 50 mph (80 km/h). Some urban areas are also posted with minimum speed limits, usually with a minimum of 40 or 45 mph (64 or 72 km/h).

School zones in Ohio normally have a 20 mph (32 km/h) speed limit, regardless of the road’s normal speed limit, in effect during school hours.