Layout highways, number of lanes, on and off ramps, design wacky intersections. The better your highway the more people will live far from the city and the city will grow and more people will move into the area requiring more highways...
- Mess with models of your local city and fix that interchange you use every day that drives you insane.
- Disasters! mudslides, airplanes on the highway, accidents galore, snow, rain, and more!
Have the game live on an ipad for a nice intuitive touch sensitive way of drawing intersections.