US 33

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US 33 enters Ohio from the west near Willshire as a two-lane route. It continues southeast as it crosses US 127 on its way to St. Marys, where it becomes a 4-lane parkway and eventually a controlled-access highway as it approaches Wapakoneta and I-75.

East of I-75 the road once again becomes a two-lane route as it continues to Lakeview and Russells Point near Indian Lake. At US 68 in Bellefontaine, US 33 becomes a controlled-access highway as it passes Campbell Hill, the highest point in Ohio, and continues through Marysville. Entering Franklin County, the road becomes multiplexed with State Route 161. It then intersects with I-270 in Dublin.

Going past I-270, the route loses its controlled access and goes though the Dublin Historic District and across the Scioto River. The multiplex with Route 161 ends here as that road continues east towards Worthington. US 33 heads south on Riverside Drive towards downtown Columbus, following the Scioto River and creating the western border of Upper Arlington, where it passes Griggs Reservoir, a dam that is one of the main sources of water for the city of Columbus. The road changes names two times, first to Dublin Road at the intersection with Trabue Road, and then to Spring/Long Streets at State Route 315. The route continues south on 3rd/4th Streets and then east on Livingston Avenue heading towards Driving Park.

In Bexley, the route veers southeast onto College Avenue and intersects with Interstate 70. After the traffic light at Petzinger Road, the route becomes a controlled access highway. It subsequently intersects State Route 104, I-270 (for the second time), and State Route 317 (Hamilton Road). Following the Ebright Road overpass, the highway continues as a non limited access expressway.
US 33 south of Athens

Construction of a Lancaster bypass started at the end of the 1990's and was completed in 2005.[2] The new highway is completely limited access, which saves motorists up to 15 minutes versus going through the city. Continuing southeast, the highway enters the Hocking Hills region as an expressway. Near Logan, the highway again becomes limited access for approximately 13 miles (21 km). As the road approaches Nelsonville, it becomes a windy 2 lane road which runs near the Hocking River. Further southeast towards Athens, the expressway design resumes followed by a brief limited access section near the intersection with U.S. 50 and Ohio State Route 32. There are plans within the Ohio Department of Transportation that will turn much of 33 south of Columbus into a controlled access highway as the southeastern part of Ohio lacks a sufficient road artery.

en.wikipedia.org/wiki/U.S._Route_33