If a state route continues into another state, the neighboring state's route number is given, if applicable. For U.S. and Interstate routes, the overall terminals of the route are given. A list of Ohio counties through which the route passes is given. The route's length in miles is given. The route's overall general direction is given.
Some routes have an obvious change in direction.
Such changes are noted. What qualifies as a dual certification is a bit of a judgment call. The rule of thumb is that the two routes run together for 5 miles or more. Cases of routes intersecting, with one route following the other for a mile or less are not considered dual certifications. With each dual certification, one route is considered to be the primary route, while the others are considered to be secondary.