关键词: 交通运输工程；主动交通管理；交通流特征参数；交通流特性；交通流波速理论

Abstract: In order to adapt to the needs of active traffic management strategies, the traffic flow characteristics of expressways were studied. Based on the traffic microwave radar detector data, the traffic flow wave speed theory and the macro traffic flow model were used to divide the traffic flow state into non-congested state, transitional state and congested state. According to the theory of traffic flow wave speed, the variation characteristics of density, speed and occupancy ratio of each lane under congestion state were analyzed, and the threshold of lane-level traffic state division was studied. The macro traffic flow models such as Pipes, Van Aerde and Newell were respectively used to fit the traffic flow section observation data and lane observation data, and the traffic flow parameters based on the macro traffic flow model were estimated. The research results show that there are significant differences in the traffic operation time series characteristics and traffic conditions of different lanes, and the Van Aerde model has the best fitting effect on the traffic flow operation data among the three classical models. Based on the comprehensive analysis results of traffic flow wave speed theory and macroscopic traffic flow models, the threshold for determining traffic flow state has been obtained.

Key words: traffic and transportation engineering; active traffic management; traffic flow feature parameters; traffic flow characteristics; theory of traffic flow wave speed