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Ohio is a sunshine state regarding data, and does abide by open data accessibility practices. All of the datasets published on the TIMS site are available for public use, and no copyright applies.
The Official Transportation Map example included in the Copyright section of ODOT's Privacy Notice and Policies page is referring to a physical print map the Department produces periodically (ones you might find at Interstate Rest areas), which is still made available free to the public, however, a copyright may apply to that specific product for different reasons. Our Legal Department could probably explain why a product like that includes a copyright.
While all best efforts are made regarding the maintenance and accuracy of the data published in TIMS, all of the datasets published in TIMS are provided with no warranties, expressed or implied, concerning the accuracy, reliability or suitability of this data have been made by the Ohio Department of Transportation or any other state agency.

The Township Boundary file is maintained by our Road Inventory team to assist with our Certified Mileage program. The boundary file is not a requirement of the Certified Mileage program however, but a by-product. This means these boundaries are edited in a manner more closely reflecting status of roadways instead of property parcels, which in Ohio are maintained by local County Engineers. Whether or not each County Engineer maintains a parcel based boundary files like this may vary across the state. All GIS data maintained by ODOT is delivered at a planning grade precision and accuracy vs. a survey grade. The Township boundaries are updated annually in TIMS. FYI - the County Boundary file is simply a dissolve of the Township boundaries, so they should be topologically aligned.

Thanks for reaching out and I hope this clarifies your concerns! Please let us know if you have any further questions regarding the data in TIMS. There are many great features within the OSM product and we've actually considered leveraging it for different purposes. I know that NCDOT is actually supplementing some of their operations with OSM data for some of their purposes

Thanks,
lan Kidner, GISP
GIS Program Manager
ODOT Office of Technical Services