Cities don't install enough sensors. They are probably the best way to improve traffic outside busy times. The coolest implementation I've seen was in Los Alam

Cities don't install enough sensors. They are probably the best way to improve traffic outside busy times. The coolest implementation I've seen was in Los Alamos. The sensor was way ahead of the intersection so by the time I got to it, without slowing down, the light changed. This was more than 25 years ago.