修筑农村公路应考虑综合成本

通过对水泥混凝土路面和沥青路面建设成本、养护成本和使用寿命的综合成本计算与分析,论述了修筑水泥混凝土路面是农村公路建设中应该采取的技术政策,是使用期间综合成本最低的路面。     

Platooning on two-lane two-way highways: An empirical investigation

This paper presents an empirical investigation into platooning on two-lane two-way highways. The main objective is to better understand this phenomenon that has important implications on traffic performance and safety. Field data from three study sites in the state of Montana were used in this study. Separate investigations were performed to examine the relationships among platoon-related variables, namely; time headway, travel speed, and platoon size. The study confirmed that interaction between successive vehicles in the traffic stream generally diminishes beyond a time headway threshold value that fell in the range of 5–7 seconds. Also, the study revealed that very short headways (less than one second) are more associated with aggressive driving and higher speeds than with slow-moving platoons due to lack of passing opportunities. Further, the study found that amount of impedance to traffic is proportional to the size of platoon as evidenced by the relative difference between mean speed of various size platoons and the mean speed of unimpeded vehicles. The study provided other valuable insights into the platooning phenomenon on two-lane highways that are essential in developing a better understanding of traffic operation on two-lane highways.     

基于公路增量投资的重庆市干线公路超限车辆补偿费分析

目前 ,国省道干线公路超限运输日益严重 ,采用经济手段收取一定的超限车辆补偿费是实施超限运输管理的一种措施 .基于超限车辆引发的公路增量投资经济分析 ,提出了重庆市干线公路的超限车辆补偿费标准 ,供制定超限车辆管理政策时参考     

货车移动遮断影响下的小客车驾驶行为识别

为识别山区双车道公路货车移动遮断影响下的小客车驾驶行为，通过无人机拍摄和图像 处理提取车辆轨迹数据，根据车头时距、小客车横向位置曲线斜率的阈值标准，标定小客车的跟 驰、换道和超车这3种驾驶行为类别；采用Kruskal Wallis检验和主成分分析法对小客车驾驶行为 特征参数进行筛选和降维，获取识别模型输入变量；运用网格搜索算法确定核函数最优参数组 合，建立基于支持向量机(SVM)的货车移动遮断下小客车驾驶行为识别模型。以云南省典型山区 双车道公路为例，多维度分析货车移动遮断下的小客车驾驶行为特性，并对识别模型进行训练和 测试。结果表明：货车移动遮断下小客车的行车速度比自由流条件下低约20~30 km·h-1；小客车 在山区双车道跟驰货车行驶时的平均车头时距为2.53 s，小于相关规范中规定的最小安全车头时 距，跟驰行车风险较大；基于SVM的货车移动遮断下小客车驾驶行为识别模型的识别准确率达 98.41%，具有良好的识别能力和应用前景。     

浅议一、二级公路辅路设计

该文首先阐述了一、二级公路常见的辅路形式—主线与辅路并列方式。接着以上海曹安公路等为例,介绍了其若干设计内容。最后就辅路设置的条件提出一些看法供同行们一起探讨。     

双车道公路路侧净空与街道化对运行速度的影响

对22条双车道公路直线路段进行调查,获得了路侧净空与车辆运行速度的关系;以基准道路条件建立了路侧净空对运行速度的影响模型;采用R语言统计分析软件分析了街道化路段运行速度、建筑物距离和正常路段运行速度三者之间的相关关系,并采用统计回归的方法建立了街道化对运行速度的影响关系模型。结果表明:运行速度与路侧净空之间存在对数关系;街道化路段运行速度与建筑物距离相关性很强,而与正常路段运行速度相关性很低。     

水泥桩联合浅层置换处理控制桥台后路基沉降

针对温州市一桥台后施工期间所遇到的实际问题,综合考虑各种因素,提出了在软土地基上控制桥台后沉降的联合处理法,为软土地区类似工程的设计与施工提供参考。     

开普封层技术在农村公路建设中的应用

统筹城乡协调发展,必须重视农村公路建设。通过对开普封层结构特点分析和施工问题介绍,结合重庆地区工程应用实例,证明开普封层作为农村公路建设中的一种新型路面,具有造价低廉、施工方便快捷、维护便利、行车舒适等优点,可广泛应用于农村公路建设。     

A new,non-canonical Poisson regression model for the prediction of crashes on low-volume rural roads

The purpose of the study was to compare the prediction power of a simplified non-canonical Poisson crash-prediction model to other model types. The model, fitted to serious and fatal crash data from 86 two-lane low-volume rural highway segments, showed a good fit, which was not significantly different from that of a negative binomial model. The application of the present model uses the linear form of the non-canonical Poisson model. Hence the simplification of the model versus other models results from the finding that the expected number of crashes per 1 km is directly proportional to the daily volume, unlike logarithmic functions in other models. In the non-canonical model, it is necessary to estimate only one parameter, whereas estimations of more parameters are needed in the negative binomial model.     

高速公路绿化景观模式研究

根据高速公路绿化设计的要求,提出了高速公路绿化设计的指导原则,从植物学、生态学、环境美学的角度,阐述了高速公路中分带、防护栏、边坡、公路两侧、互通区、服务区的绿化设计手法和植物配置模式。