I live four houses south of the intersection of Rossford and N. Fort Thomas Ave. There is a speed limit sign of 25 MPH posted just north of my driveway. Do you think it is effective? No! Some autos, pickups, commercials vehicles disregard the sign. The same is true of vehicles traveling south towards the intersection. It seems to me because of a stop sting at the intersection, vehicles must get up speed to break the speed limit. I think it's psychological. My neighbor has a radar gun and has clocked speeds of 50MPH.
We have small children playing around the area (the parents do a great job training them not to run in the street) but it might be only a matter of time before an accident might happen.
I don't know the solution to the problem. Maybe bright flashing lights installed by the speed limit signs would work. There used to be flashing lights new Johnson School area, but for some reason there were removed.