高速公路施工区中间带开口长度与交通运行特性研究

Study on Median Opening Length and Traffic Operation Characteristics of Expressway Construction Area

为了保障高速公路改扩建期间施工区交通安全,对施工区进行有效的交通组织;缓解中间带开口处因车道变换造成的交通拥堵及交通安全问题,提出合理的施工区中间带开口长度,对高速公路改扩建施工区中间带开口长度与交通运行特性进行了研究。根据车辆通过中间带开口处的行驶轨迹特点建立了中间带开口长度理论计算模型,并依据计算模型分析了中间带开口长度影响因素,给出了不同限速、中间带宽度及横向坡度下的开口长度计算值。利用微波测速仪采集不同中间带开口长度下各区段车辆自由流速度样本,基于实测数据研究了不同开口长度下的交通运行特性。运用交通仿真方法,对不同中间带开口长度下的交通流量、速度特性进行研究,分析了不同开口长度下的车辆运行速度、开口段通行能力、驾驶员限速遵守率等指标,给出了不同设计速度及开口长度下的中间带开口处通行能力建议值。研究结果表明:高速公路改扩建施工区开口长度是影响车辆运行速度、通行能力与驾驶员限速遵守率的重要因素。中间带开口长度建议值、开口处通行能力的提出及交通运行特性的研究对现状高速公路改扩建施工区中间带开口处交通组织及安全保障具有一定指导意义。

In order to ensure the traffic safety of the work zones during expressway reconstruction and expansion,effective traffic organization is carried out for the work zones.The traffic congestion and traffic safety caused by lane changing at the median opening are alleviated,a reasonable opening length of the median opening of the work zones is proposed,and the length and traffic operation characteristics of median opening in reconstruction and expansion work areas of expressway are studied.A theoretical calculation model of the opening length is established according to the characteristics of the vehicle driving path through the median opening.According to the calculation model,the influencing factors of the opening length are analyzed,and the opening length calculation values in different speed limits,median widths and lateral slopes are given.The vehicle free-flow velocity samples of different sections in different opening lengths are collected by Microwave speedometer,and the traffic characteristics in different opening lengths are studied based on the measured data.By using traffic simulation method,the traffic volume and speed characteristics in different opening lengths are studied.The vehicle running speed,the opening capacity of the opening section and the driver speed limit compliance rate are analyzed.The recommended values of the capacity of the median opening in different design speeds and opening lengths are given.The research result shows that(1)the opening length of the expressway reconstruction and expansion work area is an important factor affecting the vehicle running speed,traffic capacity and driver speed limit compliance rate.The recommended opening lengths and the proposed capacity of the opening and the study of the traffic operation characteristics are of certain guiding significance for the traffic organization and safety guarantee at the median opening of expressway reconstruction and expansion work areas.