Intelligent network connection external left turn lane dynamic control method and system

The invention discloses an intelligent network connection external left-turn lane dynamic control method and system. The control method comprises the following steps: monitoring vehicle positions, speeds, driving routes and vehicle type types on a road section within a period time; judging whether the vehicle with the left-turn demand can smoothly change the lane to the left-turn lane or not; the influence of the left-turn vehicle on traffic safety and operation efficiency and the difficulty of completing left-turn operation in the vehicle intersection range are evaluated; whether an external left-turn lane is started or not is decided, and a corresponding signal phase is adjusted; and providing vehicle speed and lane guidance for the monitored vehicle, and completing dynamic control of the external left-turn lane in the period. The control system comprises a vehicle information acquisition module, a data transmission and sharing module, a data analysis and processing module, a traffic control module and an i