From Page 36 of the "Digest of Ohio Motor Vehicle Laws" ( http://www.bmv.ohio.gov/pdf_forms/HSY-7607.pdf ) (Emphasis added):
When passing to the left, the law requires that a driver overtaking another vehicle do these things:
1. Sound the horn to warn the driver of the vehicle being overtaken that he/she is about to be passed.
2. Signal the intent to pass.
3. Pass to the left of the vehicle being overtaken at a safe distance and return to the right side of the roadway only after the overtaking vehicle is safely clear of the vehicle being overtaken.
4. Return to the right lane as soon as the pas has been safely completed and before coming within 200 feet of any approaching vehicle.
The law must be different where you live.
Does anybody actually do that? I mean really, honk every single time you pass a car on a one by one? Don’t know what the law is here but I do know I have never once had anybody do that when passing me, not here in AZ, not visiting the in-laws in NM, not visiting my friend in CA, not when passing through parts of TX, OK, KS, IL or WI for a funeral.