My wife thinks that the lot has a central location in the Toledo area, and certainly the lot's close proximity to Interstate 475 offers the cab drivers easy access to the Toledo freeway loop. This pharmacy is also close to the Toledo Hospital, Westfield Franklin Park, and the University of Toledo.
One of these days I will make it a point to stop and chat with a few cabbies and learn the secret. Maybe the real reason this place is heavily trafficked by cab drivers is that it is a stone's throw from Netty's Hot Dogs, the ultimate in eating-on-the-go.