Bridge overload early warning method and system

The invention discloses a bridge overload early warning method and system, and the method comprises the steps: obtaining a driving image of a vehicle driving in an early warning bridge segment, and determining the identification information of each target vehicle and the current lane of the vehicle driving in the early warning bridge section according to the driving image; obtaining the weight information of each target vehicle to determine the total vehicle weight of each lane in the early warning bridge section; judging whether at least one target lane has a lane overload condition or not according to the total vehicle weight of each lane and the bearing threshold value of each lane; if yes, making a pre-driving lane for at least one target vehicle on the target lane according to a preset rule, wherein the pre-driving lane is a lane with the lowest lane changing difficulty coefficient except the target lane in the early warning bridge section; and displaying the lane information of the pre-driving lane and