Greetings, I have been reading the forum for a long time, and finally decided to join!!
I was born and raised in Cincinnati, and live there now, but have also lived in Columbus, as well as various places in Michigan, Maryland, and New Hampshire.
I have been fascinated with roads and road numbering systems since I was a kid - when I was about 14, I made a mobile of highway signs out of cardboard.
I live about 2 miles from the junction of interstates 74 & 75 - one of three places in Ohio where adjacently numbered interstates intersect - actually the other two (70/71 and 76/77) both contain concurrencies. If and when 73 gets built and 74 gets extended, we'll have four places like that.
My geekiness in numbering systems also extends to license plates and telephone exchanges. I never thought about driver license numbering systems until I moved to Maryland and got the same 13-character driver license number as I had in Michigan - because they both use the same convoluted system.