Traffic signal control method

Abstract

The invention discloses a traffic signal control method. According to the method, data are acquired, digital quantity processing of external environments is performed by the aid of a PLC (programmable logic controller) and an AD acquisition module, acquired objects are humidity and temperature of earth surfaces, signals fed back by a temperature sensor and a humidity sensor are 4-20mA current signals, corresponding current signals are converted into concrete numerical values ranging from 0 to 255 by the AD acquisition module, the concrete numerical values are inputted into the PLC, an illumination sensor is used for acquiring illumination intensity signals, so that day or night is distinguished, voltage signals are directly fed back by the illumination sensor, an optical coupler is directly triggered by voltage, the signals are transferred to an optical coupler isolation module and are transmitted to the PLC, then the PLC transmits digital signals to a PC (personal computer) through a GSM900A, and many-to-many data transmission is achieved by the aid of a local area network formed by the GSM900A.

Description

Technical field [0001] The invention belongs to the field of intelligent transportation, and relates to a traffic intelligent control method using multiple signal cooperative processing and wireless transmission technologies. Background technique [0002] With the progress of the social development era, motor vehicles have entered thousands of households. At the same time, it also brought tremendous pressure to traffic problems. Although there are traffic lights at intersections, this can solve the problem of traffic guidance. However, there are times when vehicles are very congested in one direction at an intersection, while there are basically no vehicles in the other direction. This is because the unreasonable signal lights cause traffic jams. Moreover, traffic accidents occur from time to time. Although speed limit warning signs are installed in many places, due to factors such as day and night light in the weather and seasons, the speed limit signs with the same speed lim...

AI Technical Summary

Problems solved by technology

But sometimes the traffic in one direction of the intersection is very congested, and there is almost no traffic in the other direction.

This is because traffic jams are caused by unreasonable signal lights

Moreover, traffic accidents happen from time to time. Although many places have speed limit warning signs, due to factors such as weather, seasons, day and night, and light, the speed limit signs that have remained unchanged cannot achieve a safe speed limit effect.

Some drivers think that the speed limit is a safe speed, but they don't know that the safe speed is affected by many factors

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