Analysis On Traffic Flow Characteristics In Freeway Tunnel

Tunnel on the highway which as a special structure is invisible road bottlenecks, based on considerations of travel safety, the tunnel section has the speed limit, resulted in speed bottleneck, In the traffic peak season periods, highway congestion in the tunnel time is frequent, Investigate the highway tunnel traffic flow characteristics, awareness of changes of traffic flow, It provide important theoretical support for Expressway Tunnel Management.This paper studies traffic flow of Tunnel, the first, review the development of our state highways and define highway tunnels'classification to the tunnel, It take three aspects to consider highway long tunnel the traffic flow factors:the tunnel's structure, traffic conditions and traffic Run.On this basis, do research in the tunnel sections, survey data according to the Western Han Dynasty Qinling Tunnel, analysis of freeway traffic flow Tunnel features' three parameters:traffic volume, speed, headway characteristics, and establish high-speed Typical section of Highway Tunnel Traffic Flow three-parameter model.By comparing the long tunnel of the traffic flow characteristics and parameters of three-parameter model for different segments of Tunnel traffic flow variations, the long tunnel section is divided into four sections:normal sections-section of extraAnalysis highway traffic spatial distribution of the tunnel section in further; consider each section of highway conditions, in sub-free flow and congested flow of two cases, meet the conditions of the situation, combined highway tunnel operating characteristics of different sections about the traffic flow, Construction Highway state mode on traffic flow.