I'm curious how common this is across the US. I grew up on the MA/NH border. All the various cities and towns on the border kind of meshed together, so it was quite common to cross state lines to do everyday things like grocery shopping or guitar practice or seeing a friend. We would cross state lines up to 6 times a day and not even think about it, especially when the drive was 10 minutes or less. Where else is like this in the US, and how much of a phenomenon is this?