Abstract:In response to the severe challenges faced by traffic organization during the reconstruction and expansion of mountainous expressways, taking the reconstruction and expansion project of the Guilin-Liuzhou Expressway as a background, the traffic capacity of the construction area and its influencing factors are systematically defined, providing a basis for scientifically formulating the schemes of traffic organization. Based on the measured traffic data in the construction area, a system of traffic capacity correction coefficients covering traffic composition, lane closure forms, speed limits, and the length of the central median opening is established. By integrating these correction coefficients, a traffic capacity correction model for the construction area is proposed. The research results show that small vehicles are the core vehicle type in this type of reconstruction and expansion project (accounting for more than 60%). The traffic capacity correction coefficients for the scenarios of one and two lanes closed are 0.887 and 0.471, respectively. And the correction coefficients corresponding to different combinations of speed limits and the length of the central median opening are quantified. The established correction model can support the quantitative decision-making for lane configuration and traffic flow control in the construction area. However, limited by the sample data, it is necessary to expand the sample data of multiple terrains and realize the dynamic nature of the model in order to enhance its universality and timeliness.
