Traffic Jam

I like your solution of making the buildings transparent , it is something I might copy for my game too :D . I don't know if it normal but I don't hear any sound at all: could it be a BUG? Controls, better to use the mouse.

Nice polished look! I like the idea a lot. I'm not a giant fan of the controls, though with practice they probably work fine. For a simple game like this, I'd almost rather just use the mouse and click the lights.

Good work!

Very nice simulation. I've always assumed this is how all traffic lights work. 

Not going to lie, I let this sit on game over for a while just because the colliding cars are pretty fun to watch. Very bouncy and lively.

I enjoyed the idea! I would only maybe add that it could benefit if there was some way to know  if a car was planning on turning. I thought I was being super clever by activating left and right lights simultaneously on my second go around, only to watch one turn directly into the other.  That way, you may still want to only activate one light but you can get an idea as to whether or not you want to risk it.

I like the concept. Love how the cars flip over when they collide.

I feel like the arrow key controls are a little confusing since it's an isometric perspective. I feel like toggling the lights by clicking on them would work better, and it'd even work as a mobile game that way.

You could also add some additional feedback on which direction the traffic is able to move by adding an arrow along the ground when the light is toggled. As it is, the lights are pretty small so I found myself losing track of which lights I had toggled.