基于轨迹数据的非机动车道内冲突事件自动识别与可视化

准确识别非机动车道内的交通冲突事件既是量化评价非机动车道安全水平的基础,也是剖析与理解非机动车道内运行风险产生与发展过程的重要前提.基于轨迹的交通冲突识别与分析技术已被运用于城市交叉口处机动车之间以及机非之间的交互安全分析,但目前鲜有聚焦非机动车道场景内交通冲突事件的分析方法.针对该问题,提出一种基于个体的(Agent...     

基于失控车辆行驶特性的平行式避险车道研究

为了解决分离式避险车道存在的安全问题,分析了境内外分离式避险车道存在的不足,基于失控车辆行驶特性对平行式避险车道平面设计、纵面设计、横断面设计和路床材料选择等进行分析和研究,并对平行式、分离式避险车道进行了对比分析。研究认为平行式避险车道以驾驶员自救为原则,在驾驶员认为车辆存在较大的失控风险或车辆已失控时驶入,在避险车道停驻或速度降低后,再驶入主线,设置条件更为灵活,易于救援,工程规模小,值得深入研究和推广。     

城市轨道交通建设中的路灯管线改迁

介绍了城市轨道交通建设中市政路灯管线的改迁措施，结合深圳市地铁建设经验，提出了路灯管线改迁原则，针对目前路灯管线在改迁过程中出现的各种问题，提出相应的建议。     

A dynamic automated lane change maneuver based on vehicle-to-vehicle communication

Automated driving is gaining increasing amounts of attention from both industry and academic communities because it is regarded as the most promising technology for improving road safety in the future. The ability to make an automated lane change is one of the most important parts of automated driving. However, there has been little research into automated lane change maneuvers, and current research has not identified a way to avoid potential collisions during lane changes, which result from the state variations of the other vehicles. One important reason is that the lane change vehicle cannot acquire accurate information regarding the other vehicles, especially the vehicles in the adjacent lane. However, vehicle-to-vehicle communication has the advantage of providing more information, and this information is more accurate than that obtained from other sensors, such as radars and lasers. Therefore, we propose a dynamic automated lane change maneuver based on vehicle-to-vehicle communication to accomplish an automated lane change and eliminate potential collisions during the lane change process. The key technologies for this maneuver are trajectory planning and trajectory tracking. Trajectory planning calculates a reference trajectory satisfying the demands of safety, comfort and traffic efficiency and updates it to avoid potential collisions until the lane change is complete. The trajectory planning method converts the planning problem into a constrained optimization problem using the lane change time and distance. This method is capable of planning a reference trajectory for a normal lane change, an emergency lane change and a change back to the original lane. A trajectory-tracking controller based on sliding mode control calculates the control inputs to make the host vehicle travel along the reference trajectory. Finally, simulations and experiments using a driving simulator are conducted. They demonstrate that the proposed dynamic automated lane change maneuver can avoid potential collisions during the lane change process effectively.     

Adaptive road border crossing system management: the role of priority programs

Land border crossings in North America, such as those between Canada and U.S.A., are expected to experience severe imbalance of travel demand and capacity of processors. During peak travel periods, this is already the case at high traffic locations. The land border crossing authorities have to address problems of congestion, national security and environmental impacts in the operation of the existing systems and to continue to address these problems as a part of infrastructure expansion plans. There is a need to adapt the crossing system management in order to accommodate efficiency and productivity‐oriented priority crossing measures. From a methodological perspective, it is a challenge to evaluate the role of priority crossing measures within the complex border crossing system. This paper reports research on modelling priority crossing initiatives. A microsimulation approach was used to model and analyse integrated processors of the Peace Bridge crossing system between Fort Erie (Ontario) and Buffalo (New York) under different scenarios of travel demand, customs processing times, priority crossing and queue jump lanes for automobile and truck traffic. Findings show the extent to which a border crossing system with priority crossing and queue jump lanes is more efficient and productive than one without these innovations. Copyright © 2011 John Wiley & Sons, Ltd.     

Brain limbic system-based intelligent controller application to lane change manoeuvre

This paper presents the application of a novel neuromorphic control strategy for lane change manoeuvres in the highway environment. The lateral dynamics of a vehicle with and without wind disturbance are derived and utilised to implement a control strategy based on the brain limbic system. To show the robustness of the proposed controller, several disturbance conditions including wind, uncertainty in the cornering stiffness, and changes in the vehicle mass are investigated. To demonstrate the performance of the suggested strategy, simulation results of the proposed method are compared with the human driver model-based control scheme, which has been discussed in the literature. The simulation results demonstrate the superiority of the proposed controller in energy efficiency, driving comfort, and robustness.     

水泥路面改造加铺沥青面层施工技术

以合宁高速公路改造实践为例,介绍了原水泥混凝土换板、沉降注浆处理加固软弱板块、冲击压实机理,分析了提高原路面的整体稳定性的方法,并阐述了用沥青混凝土照面的机械化施工技术工艺.     

截面转换加固T梁桥技术的试验研究

在完成4片模型试验梁的制作、加固前后测试的基础上,对比分析了钢筋混凝土T型梁作加固增强处治截面转换成箱型梁前后的应变、挠度、剪力滞后效应、抗扭刚度和极限承载力指标。试验证明,T型梁截面转换成箱型梁后,新增设的钢筋混凝土底板能与原T梁协调变形、共同承担活载。该加固增强技术可有效提高T型梁桥的承载能力,广泛应用于实践。     

高速公路合流区上匝道混合车流通行能力经验计算法

研究高速公路合流区上匝道混合车流的通行能力的计算问题。利用已有的高速公路合流区外侧车道交通特征分析结论,推求在外侧车流不同车头时距分布特征下的上匝道混合车流汇合概率模型。运用回归技术和统计方法,建立了加速车道合流点分布概率的实测经验模型。对可接受间隙理论的原型进行了形式上的修正,最终建立高速公路合流区上匝道的混合车流通行能力经验模型,它是主路交通量、匝道交通量、加速车道长度、匝道混合车流比例以及各自的临界间隙和随车时距的函数。最后结合实例介绍经验模型的数值积分求解方法,并证实该经验计算方法具有较高的实效性和可操作性。     

高速公路自动停车道设计分析

高速运输对汽车的动力性、制动性和操作稳定性的要求日趋严格，公路设计应有针对性地增加相关安全设施设计。本文以广东下庄自动行车道为例，简要介绍其设计过程，重点利用汽车动力学的观点，对纵断面的设计依据及使用效果进行分析。