U.S. Route 23 (US 23) is a United States Numbered Highway that runs from Jacksonville, Florida, to Mackinaw City, Michigan.

[2] The route bypasses Chillicothe to the east, including a short concurrency with US 35 before once again becoming a divided highway near Kingston.

The section immediately north of the northern junction with I-270 was upgraded with a northbound-only set of express lanes which passes under Dimension Drive, Campus View Boulevard, Radio City Boulevard, and Flint Road, with the former alignment of US 23 providing access to those roads.

Heading north, US 23 becomes a four-lane road with a grass median, intersections at street level, and numerous public and private driveways.

North of downtown Delaware, US 23 becomes a five-lane road, with a center lane dedicated for left-hand turns, from both directions.

[10] By 1940, US 23 was shifted westerly again in Toledo, taking the Anthony Wayne Bridge to Summit Street, then to Jefferson Avenue and Collingwood Boulevard before rejoining the previous routing.

[11] US 23 was realigned c. 1960 to follow Monroe Street northwesterly out of Toledo, joining with the first constructed segment of its current freeway routing in Sylvania.

[14] By 1969, the entire western freeway bypass of Toledo was complete, carrying the current routings of both US 23 and I-475.

[15] A plan was proposed by the Ohio Department of Transportation (ODOT) in July 2020 to improve safety along US 23 in Wyandot County by reconfiguring several intersections and closing others to eliminate cross traffic and turns across opposing traffic for the stretch of US 23 between the interchange at SR 231 in Marion County and the interchange at SR 199 south of Upper Sandusky.

[16][17][18] After public comments, the proposal was revised to drop one intersection from the plan over concerns about the impact on emergency services.

[22] Ross County had wanted the space to be utilized into a full interchange with Marietta and Seney Roads as a part of their 2008 Thoroughfare Plan.

To improve its safety, beginning April 11, 2022, ODOT will convert the intersection to a pair of right-in/right-outs and close the median crossover.