A traffic system for predicting a traffic signal switching timing comprises a camera sensor including a) a camera for capturing images of traffic signal lights along a traffic lane, b) a CPU for running computer programs for analyzing the images of the traffic signal lights and the moving objects, wherein the traffic signal switching timing includes a yellow, red and green lighting time of each the traffic signal lights, c) a sound sensor for obtaining sound signals originated from the moving objects, and d) a communication interface for sending and receiving data associated with the traffic signal switching timing to/from other camera sensors; and a server for providing traffic information including the traffic signal switching timing to drivers of the moving objects, the sever being arranged to receive and sends the data to/from the camera sensor.