No more waiting (on Red Lights)!

The waiting time is not the only thing unpleasant with the signalized intersections. Vehicles consume fuel and emit greenhouse gases while waiting for the light to change. Even with the start&stop systems of today and electric cars, energy is wasted on air conditioning and ancillary equipment. Researchers have tried to find solutions to this nuisance. The first traffic sensing systems appeared to adjust red light timings depending on the number of vehicles waiting to cross the intersection.