Different but related, and something I ran into trouble with over the weekend: My grandparents live at 297 <Road B>, and to get there you have to take <Road A>

Different but related, and something I ran into trouble with over the weekend: My grandparents live at 297 <Road B>, and to get there you have to take <Road A> off the main road in town. Well, the house immediately before you turn onto <Road B> is 297 <Road A>, but they have their driveway _and mailbox_ physically located on <Road B>. This means that it appears there are two 297 <Road B> even though the other house is on a different road! This weekend was just the pizza guy going to the wrong house, but a few months ago it was the cops when my grandfather fell and got hurt. Not a great situation!