Junxions is a traffic simulation where you control the roads, walkways, tram lines and traffic lights, and where you can generate maps based on your hometown.
There’s also a sandbox mode, for freeform experimentation, and perhaps most interestingly the ability to enter real world coordinates and generate a map based on a real world location. If you want to generate a map based on your hometown, and fix that forever-clogged junction on your commute to work, you can do so.
Okay, now you caught my attention.