Going northbound on I-75 in Cincinnati, Exit 9 is OH-561 Paddock Rd/Seymour Ave.
The next two exits are OH-126 - Ronald Reagan Highway, and Galbraith Rd. Historically, those exits have been numbered 10A and 10B respectively. All the overhead gantry signs reflect those exit numbers. But the gore exit sign at exit 10A was recently changed from 10A to 10C.
The only explanation I can think of for this is that, since exit 10A splits into two ramps, they might want to give each of them a unique number. But, if so, they should be 10A and 10B and the current 10B would become 10C, and the gore sign in question would read Exit 10A&B.
Anyone have any inside knowledge or theories? Inquiring minds....