Management of traffic signals

As I have witnessed, traffic signals are not operated properly in the city, which contributes to the increase in the frequency of traffic jams. The time management is not rational. Most traffic signals, operated manually, block traffic flow on one side of the crossing for a long time, while on the other side it is allowed to flow in short intervals. This creates a long queue of vehicles on the road.
Nowadays, green light is no more meant for vehicular movement, while the red and the yellow signals are seldom maintained. Considering the pressure of traffic, duration of traffic signals should be distributed rationally for ensuring smooth movement of vehicles.