I loved the feeling of spotting a traffic light in the distance and clicking on a tiiiny icon to solve a problem before it got out of hand. I think this was a cool interpretation of the theme! If going further I think it would be great to have icons that can show up in more places e.g. high vs. low and near vs. far, as well as some far off icons that give you an immediate benefit, and some close icons that give you a benefit later on. Great job!!