排序方式： 共有98条查询结果，搜索用时 15 毫秒
51.
基于长三角一体化发展背景,以太仓市为例,研究组团城市快速通道分布体系。研究显示与单中心城市相比,“组团式”城市的交通出行特征有显著差异性,主要以组团联系和组团内部交通为主,大流量廊道基本沿着组团OD走向,但又存在中间大量的郊区段并伴随一定的潮汐交通现象。研究表明:组团城市建设快速路是完全可行的,快速路的选线上要兼顾组团联系为主,形态上以服务大客运OD为主。另外快速路的末端可采用快捷路（或主干路）衔接,延伸快速路敷设范围,近期保证设施效益的最大化,远期也可快捷路快速化改造,实现城市快速路网络化布局的可能。 相似文献
52.
采用车道边论证方法进行吴淞口邮轮码头的交通组织设计,对极端工况下的车流量进行了定量分析,得出引桥交通量及码头面上的车位布置数等重要交通组织参数。并通过仿真方法证明交通组织方案的合理、有效,与理论计算互为补充。 相似文献
53.
大城市合乘优先的规划方法研究 总被引：1，自引：0，他引：1
王维礼 《重庆交通大学学报(自然科学版)》2010,29(2):248-253
针对我国大城市及中心区的交通特征,分析合乘优先规划的影响因素;借鉴世界发达国家实施合乘优先的经验,提出合乘优先的规划内容;以上海市中心区为试点,依据规划方法与相关交通调查,提出了上海市中心区合乘优先规划建议。 相似文献
54.
随着路网的完善,国省道公路大中修是未来公路养护部门的主要工作。通过某省道大中修工程,根据左右幅病害及交通轴载完全不同的现状,提出国省道路面大中修分车道设计理念。 相似文献
55.
Priced managed lanes are increasingly being used to better utilize the existing capacity of the roadway to relieve congestion and offer reliable travel time to road users. In this paper, we investigate the optimization problem for pricing managed lanes with multiple entrances and exits which seeks to maximize the revenue and minimize the total system travel time (TSTT) over a finite horizon. We propose a lane choice model where travelers make online decisions at each diverge point considering all routes on a managed lane network. We formulate the problem as a deterministic Markov decision process and solve it using the value function approximation (VFA) method for different initializations. We compare the performance of the toll policies predicted by the VFA method against the myopic revenue policy which maximizes the revenue only at the current timestep and two heuristic policies based on the measured densities on the managed and general purpose lanes (GPLs). We test the results on four different test networks. The primary findings from our research suggest the usefulness of the VFA method for determining dynamic tolls. The best-found objective value from the method at its termination is better than other heuristics for all test networks with average improvements in the objective ranging between 10% and 90% for revenue maximization and 0–27% for TSTT minimization. Certain VFA initializations obtain best-found toll profiles within first 5–50 iterations which warrants computational time savings. Our findings also indicate that the revenue-maximizing optimal policies follow the “jam-and-harvest” behavior where the GPLs are pushed towards congestion in the earlier time steps to generate higher revenue in the later time steps, a characteristic not observed for the policies minimizing TSTT. 相似文献
56.
This paper presents an empirical study in investigating user heterogeneity of Value of Time (VOT) and Value of Reliability (VOR). Combined Revealed Preference (RP) and Stated Preference (SP) data were used to understand traveler choice behavior regarding the usage of managed lanes (MLs). The data were obtained from the South Florida Expressway Stated Preference Survey, which focused on automobile drivers who had traveled on the I-75, I-95, or SR 826 corridors in South Florida. Mixed logit modeling was applied and indicated an average value of $13.55 per hour for VOT and $16.13 per hour for VOR. Potential sources of heterogeneity in user sensitivities to time, reliability, and cost were identified and quantified by adding interaction effects of the variables in the mixed logit model. The findings indicated that various socioeconomic demographic characteristics and trip attributes contributed to the variations in VOT and VOR at different magnitudes. The results of this study contribute to a better understanding on what attributes lead to higher or lower VOT and VOR and to what extent. These findings can be incorporated into the demand forecasting process and lead to better estimates and enhanced analytical capabilities in various applications, such as toll feasibility studies, pricing strategy and policy evaluations, and impact analysis. 相似文献
57.
随着智能网联车辆相关技术的不断突破和快速发展,高度自动化的无人驾驶汽车日益成熟并将逐渐进入大众生活. 区别于人工驾驶车辆,无人驾驶汽车具备环境感知、自主决策、控制执行等功能,能够完成典型工况或所有工况的自动驾驶. 而对道路设施进行改进和调整,有助于加快无人驾驶时代的到来,为此,需要明确无人驾驶汽车对道路设施设计的需求和影响. 首先,在平纵线形、横断面设计、交通标志标线、停车设施和数字化道路设施等方面分析了道路设施如何适应无人驾驶汽车的行驶特性;其次,梳理了智慧路侧设施以及无人驾驶专用车道的现状和发展趋势;再次,归纳了国内外面向无人驾驶汽车的道路基础设施的研究方法,包括虚拟仿真测试和实车道路测试,以及国内外为开展实车测试所实施的实验道路建设;最后,总结了现有研究的聚焦点和局限性,展望了该领域所面临的挑战和未来发展趋势. 现有道路基础设施的规划设计没有预见无人驾驶汽车的到来,在无人驾驶全面普及之前,人工驾驶和无人驾驶混行会长时间存在,因此,道路设施设计应根据无人驾驶的发展阶段和未来趋势进行相应的变革,本文为适应无人驾驶汽车的道路设施设计提供了理论基础. 相似文献
58.
城市交通流潮汐现象导致了路段双向通行能力利用不均衡,早、晚高峰时段交通需求的不对称导致了早、晚高峰时段拥堵路段不具有空间对称性.本文从城市交通网络的角度出发,提出了一种对早、晚高峰时段可变车道设置方案进行综合决策的方法.以交通均衡理论为基础,以降低城市交通网络高峰期出行总费用和减少可变车道设置管理成本为目标,建立了一主二从双层规划模型,其中上层为可变车道设置的决策方案;下层根据上层决策方案分别对早、晚高峰时段交通需求进行交通分配,并设计了求解模型的遗传算法.算例分析表明,与不设置可变车道方案、早晚高峰时段分别设置方案进行比较,早晚高峰时段综合设置方案减少了系统总费用. 相似文献
59.
以某双洞八车道小净距隧道为依托,从中间岩柱塑性区域、后行洞对先行洞位移及内力的影响等几个方面,探讨了各种围岩级别下四车道小净距隧道的最小净距的合理取值,对超大断面隧道的设计有一定的借鉴意义。 相似文献
60.
To explore the potential capacity of dual-right-turn lanes at signalized intersections under mixed traffic conditions, we defined two conflict zones between right turn vehicles and through bicycle corresponding to different right turn flows from dual-right-turn lanes. Relationships between the arrival rate of bicycle group at each conflict zone and the saturation flow rate of right turn movement were investigated. A model based on gap acceptance theory was adopted to estimate the capacity of dual-right-turn lanes under mixed traffic conditions. An analysis was carried out using the collected data from three four-leg signalized intersections in Beijing, China, where the dual-right-turn lanes were used. In addition, we also discussed the patterns of bicycle lane in the urban area of Beijing, and classified it based on its characteristics in use. It is concluded that the two lanes of dual-right-turn lanes produce different capacities under mixed traffic conditions, and the analysis on scenarios of dual-right-turn movement traversing bicycle traffic plays a key role in explaining the different capacity performance of the two right turn lanes. Error analysis of the model indicated that the model was rational. 相似文献