In the 1970 s, the light has been using various main intersections in jinan, but by the traffic police manual manipulation, sometimes because of improper operation often form red yellow green lights light up together. Jing-chun zhao introduces, at the time of light can only be used in the traffic police talents at work, after work to stop using. After the new duty box, the policeman to manipulation of the light within the box.

After 1994 years as the vehicles increase, beginning presents some intersection turn left and go straight vehicles. In 1995, the city first presented turning lights and left turn lanes, light also allocated accordingly. From the outside, have left turn signal lights with arrows indicate alone, go straight turn left Shared a circular is full screen.

Enter 2000 in the future, the traffic police on duty equipment modernization, science and technology. For multimedia, utility command and control center for job open provides audio and visual information. Utility of light increasingly accurate, generous, implements the center networking function, multiple phase manipulation. In 2002, in the future, city lights are used in LED lights, more than 1998 years ago using incandescent light bulb and lamp shade light more energy-saving, brightness also improved

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