Toledo, passing through Sylvania before entering Michigan. In the portion where I-75 and US 23 overlap, this is a wrong-way concurrency, with southbound I-75 concurrent with northbound US 23, and northbound I-75 concurrent with southbound US 23 in this stretch. US 23 passes near the birthplace of President Rutherford B. Hayes in Delaware, as well as near the home of President Warren G. Harding in Marion. Michigan US 23 is a freeway bypass for I-75 west of Detroit, and then the Sunrise Side Coastal Highway along the shore of Lake Huron to its end at Mackinaw City. From the state line north, US 23 passes through the Ann Arbor area, bypassing that city to the east and north; US 23 intersects I-94 southeast of downtown. Further north, US 23 intersects I-96 north of Brighton and then overlaps I-75 starting at an interchange south of Flint. The combined freeway then junctions with I-69 in downtown Flint. US 23 breaks from I-75 south of Standish, becoming a two-lane road. US 23 then goes north following Lake Huron and ends at an intersection with I-75 in Mackinaw City. History Originally known as the Columbus–Sandusky Turnpike, the road was laid out about 1820. Within four years it was noted as having frequent use, although it was in poor condition. As a result, on February 10, 1824, James Kilbourne of the Ohio House of Representatives introduced a petition to revise and correct the state road leading from Columbus and Worthington to Delaware, Norton and further north. Kilbourne believed that the Sandusky Bay was the perfect place for a harbor to open up the Ohio marketplace to New England. He fought relentlessly to establish roads from the capital to Sandusky. He laid out a southern extension of the road to tie Portsmouth on the Ohio River to the central and northern parts of the state. As a result of Kilbourne's efforts, the State of Ohio chartered the Columbus and Sandusky Turnpike Company on January 31, 1826. The following year the federal government gave in trust to the state of Ohio for the turnpike company to finance road improvements and development. An 1820 map of Ohio shows the turnpike leading from Columbus to Worthington, through Delaware into Marion County. The southern portion of the improved road was built and in use by 1828. The Columbus-Sandusky Turnpike, also sometimes known as Kilbourne Highway, was completed to Sandusky in