AMAZING game! I'm addicted. Can't wait for the next update!
SUGGESTION:
Traffic lights are frustrating. Each one has to be set individually, and it's hard to see at a glance which ones are in sync. So...
What if there was a panel where you could set all possible light phases for the map. (i.e. multiple red/green circles). You give each phase a number. Then you set individual lights on the map by giving them the corresponding number.
That way you set each phase once and can quickly copy it, or change multiple lights at once. And if the number is shown for each light on the map, you can see at a glance which ones are in sync.
Just a random idea...