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This did really well, the left lane was basically like a copy of the bottom lane in terms of traffic flow! Left light is on, off, on, off.. Right light is off, on, off, on..

The traffic lights near the bottom do seem to contribute some score, I run into traffic jams without pulling the lights slightly further back. It's fascinating how well you can do by selectively removing traffic lights and just letting the cars bump into one another

I managed this with the left light being 2 on, 2 off.. And so on, and the right one being 2 off, 2 on.. And so on! Since the cars are on a fixed seed it seems like one could do some weird things to optimize their score

The arrow system confused me quite a lot, I had no idea what that quadrouple button did until I saw your screenshot! That'll make life a bit easier ahah

Could you change the lights such that they are all red by default? It would make it a lot easier to test various things (just slap down a traffic light and hit start, knowing that no cars will be coming from that direction, so you can see how the rest of the network interacts with each other and so on), since you often have fewer green ticks than you do red, it also reduces the number of mouse clicks you have to make before a light is done