My city has the exact opposite. The signal lights have antennas and communicate with one another, but it only guarantees that a pack of cars leaving one light w

My city has the exact opposite. The signal lights have antennas and communicate with one another, but it only guarantees that a pack of cars leaving one light will always sit through the entire duration of the next light. It's horribly inefficient, which is one reason I suspect it is like this - gas taxes.