Processing method and system for two vehicles to follow legal vehicle to pass in ETC lane

The invention provides a processing method and system for two vehicles to follow a legal vehicle to pass through in an ETC lane. The method comprises the steps that it is detected that a first vehicleenters an antenna transaction area, a first vehicle element is added, transaction is automatically completed, the first vehicle is marked as the legal vehicle, and a railing is controlled for releasing; when a second vehicle is detected, a second vehicle element in an abnormal state is added, the second vehicle is captured and identified, and charging and alarming is triggered; when the first vehicle leaves the lane, the corresponding element is deleted, and the railing is controlled to recover interception according to the state of the second vehicle element; it is detected that a third vehicle enters the antenna transaction area, a third vehicle element is added, transaction is automatically finished, and the third vehicle is marked as a legal vehicle; charging of the second vehicle iscompleted in a manual mode