Method for analyzing traffic capacity of diversion influence area of multi-lane expressway

The invention belongs to the technical field of expressway traffic capacity judgment, and particularly relates to a multi-lane expressway diversion affected zone traffic capacity analysis method which comprises the following steps: acquiring a microscopic simulation model of a section of multi-lane expressway, and calibrating vehicle composition and expected vehicle speed distribution parameters of the section of multi-lane expressway by adopting measured data; setting shunting influence zone ranges in the microscopic simulation model, and setting car following behavior control parameters and lane changing behavior control parameters according to different shunting influence zone ranges; and outputting traffic volumes of different influence zone ranges by using a microscopic simulation model, and calculating the traffic capacity of the multi-lane expressway according to the traffic volumes by calculating the maximum service traffic volume of an upstream forecast section of a diversion zone and the traffic vol