Here's an early look at controlling traffic with traffic lights and barriers on our 2nd Dev Diary video in this series.
A few major features we didn't mention in the video:
The inventory, UI and funds system is not in place yet. When they're integrated, props like the traffic lights will have a value, same with everything else. If you've run out of funds, you can still have a transparent prop in your hand but you can't place it until you have the funds.
A few things that might affect your popularity level with the Buildanites (townsfolk) are: destroying sidewalk pieces or roads near their house or destroying anything that would directly affect them, holding up traffic for too long, not putting up barriers before you build the stop lights as you see in this video. By putting up the barriers, you're not causing any traffic chaos.
That's it for now, we'll have a lot more info coming very soon!