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Vehicle Navigation and Information Systems Conference, 1991最新文献

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Reliability of real-time information systems for route choice decisions in a congested traffic network: Some simulation experiments 拥挤交通网络中实时信息系统路线选择决策的可靠性:一些仿真实验
Pub Date : 1991-10-01 DOI: 10.4271/912833
P. S. Chen, H. Mahmassani
This paper investigates the reliability of information on prevailing trip times on the links of a network as a basis for route choice decisions by individual drivers. It considers a type of information strategy where no attempt is made by some central controller or coordinating entity to predict what the travel times on each link would be by the time it is reached by a driver that is presently at a given location. A specially modified model combining traffic simulation and path assignment capabilities is used to analyze the reliability of the real-time information supplied to the drivers. This is accomplished by comparing the supplied travel times (at the link and path levels) to the actual trip times experienced in the network after the information has been given. Results of a series of simulation experiments under recurrent congestion conditions are discussed, illustrating the interactions between information reliability and user response.
本文研究了网络中各路段通行时间信息的可靠性,并以此作为个体驾驶员路线选择决策的依据。它考虑了一种信息策略,在这种策略中,某些中央控制器或协调实体不试图预测当前处于给定位置的驾驶员到达每个链路时的行驶时间。结合交通仿真和路径分配能力,提出了一种特殊的改进模型,用于分析向驾驶员提供的实时信息的可靠性。这是通过将提供的行程时间(在链路和路径级别)与给出信息后网络中实际经历的行程时间进行比较来完成的。讨论了反复拥塞条件下的一系列仿真实验结果,说明了信息可靠性与用户响应之间的相互作用。
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引用次数: 14
Driver information systems: What's next 驾驶员信息系统:下一步是什么
Pub Date : 1991-10-01 DOI: 10.4271/912856
C. Querée
The paper provides an overview of some of the key technological issues and market constraints affecting the growth of driver information and navigation systems in the short to medium term. It covers trends in relevant technologies, generic markets for driver information systems, technical constraints on product development, issues affecting user demand, directions of growth, and identifies some key aspects for further analysis. Two particular issues are raised. The first relates to the need to treat driver information systems as subscriber services, and the other notes the expected entry of hand-held navigation and communication products to the market.
本文概述了在中短期内影响驾驶员信息和导航系统增长的一些关键技术问题和市场约束。它涵盖了相关技术的趋势、驾驶员信息系统的通用市场、产品开发的技术限制、影响用户需求的问题、增长方向,并确定了一些需要进一步分析的关键方面。提出了两个具体问题。第一个问题涉及将驾驶员信息系统视为用户服务的需要,另一个问题则涉及手持导航和通信产品进入市场的预期。
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引用次数: 0
Safety evaluation of TravTek TravTek的安全性评价
Pub Date : 1991-10-01 DOI: 10.4271/912830
August L Burgett
The Statement of National Transportation Policy issued by President Bush and Secretary Skinner last year points out that "innovation and technological advances within the transportation field will be vital to ensure that the system can meet the Nation's transportation requirements for the 21st century." TravTek, a major Intelligent Vehicle/Highway System (IVHS) advanced motorist information demonstration program in the United States, provides an example of just such innovation. The TravTek program focuses on the navigation and route-guidance needs of out-of-town visitors and utilizes a fleet of specially equipped rental cars as the test bed for the advanced technologies to be evaluated. One of the goals of the TravTek program is to evaluate the potential for, and identify needed enhancements for, increased safety of advanced route-guidance projects. This paper discusses the tools that will be used and the methodologies that will be developed to provide the safety component of the evaluation of TravTek. The evaluation will include the development and application of methodologies for addressing driver/vehicle interaction considerations, collision experience, and the relationship between congestion and collisions.
布什总统和斯金纳部长去年发布的《国家交通政策声明》指出,“交通运输领域的创新和技术进步对于确保交通运输系统满足21世纪的国家交通运输需求至关重要。”美国主要的智能车辆/公路系统(IVHS)高级驾驶员信息示范项目TravTek就是这种创新的一个例子。TravTek项目侧重于外地游客的导航和路线引导需求,并利用一组特殊装备的租赁汽车作为先进技术的测试平台进行评估。TravTek项目的目标之一是评估先进路线引导项目的潜力,并确定需要改进的地方,以提高安全性。本文讨论了将使用的工具和将开发的方法,以提供TravTek评估的安全部分。评估将包括开发和应用解决驾驶员/车辆交互考虑、碰撞经验以及拥堵和碰撞之间关系的方法。
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引用次数: 9
Research on anticipatory route guidance 前瞻性路线引导的研究
Pub Date : 1991-10-01 DOI: 10.4271/912787
Kan Chen, S. Underwood
This paper describes the industry-relevant basic research focus of the Michigan IVHS Program in the last two years, with an emphasis on the linkage among the various projects related to anticipatory route guidance. Future direction of this research focus will also be discussed. The critical test for Advanced Traveler Information Systems (ATIS) is whether an individual driver with an appropriately equipped vehicle will get intelligent and safe advice on traffic diversion from his originally chosen route after a congestion-causing incident is detected and verified. Such advice should take into account not only current traffic conditions but also anticipated delay that may occur before the driver reaches his destination. Therefore, the Michigan IVHS research on traffic modeling and route optimization has focused on anticipatory route guidance. The anticipatory guidance system routes the vehicles by minimizing time-dependent link costs incurred by the driver. A novel dynamic programming approach has been used to take advantage of the time-dependent characteristics of the minimal travel-time solution to reduce computation load. The computation of routes is accomplished in the vehicle so that the driver will have complete and private control of not only the objective function, but also the constraints, in the computation for his optimum route. The information to be provided from the infrastructure is a set of anticipated link costs, updated periodically, to reflect current system demand and unexpected traffic incidents. Preliminary analysis has suggested that, to minimize communication load, under certain conditions, all link costs (not just exceptional ones) should be transmitted and appropriate data compression techniques should be used. Since diversion recommendations are generated within the vehicle, no matter where the vehicle happens to be, these recommendations may arise after the driver has passed the location for safe maneuver to divert. Human factors research has been conducted to assess the safe distance before the junction for recommended diversion that should be allowed for safe diversion. This safe distance would depend on the driver characteristics, as well as on the vehicle and road characteristics (including the lane location). The guidance system should be designed so that only safe diversion advice will be given to the driver. Extension of research on anticipatory route guidance includes 1) the projection of link costs through traffic modeling and simulation, 2) inclusion of multiple transportation modes, and 3) coordination with traffic light controls. The research strategy is to generate practical guidelines for ATIS product development, which can be upgraded incrementally as additional research results become available, and as component costs change.
本文介绍了密歇根IVHS项目近两年来与行业相关的基础研究重点,重点介绍了与预期路径指导相关的各个项目之间的联系。并对今后的研究方向进行了探讨。先进的旅行者信息系统(ATIS)的关键测试是,在检测和核实导致拥堵的事故后,拥有适当装备的车辆的个人驾驶员是否能够获得有关从其最初选择的路线转移交通的智能和安全建议。这样的建议不仅要考虑到当前的交通状况,还要考虑到在司机到达目的地之前可能发生的延误。因此,密歇根IVHS在交通建模和路径优化方面的研究主要集中在预期路径引导上。预期引导系统通过最小化驾驶员产生的时间相关链接成本来引导车辆。采用一种新颖的动态规划方法,利用最小旅行时间解的时变特性来减少计算量。路线的计算在车辆中完成,使得驾驶员在计算最优路线时不仅对目标函数有完全的私有控制,而且对约束条件也有完全的私有控制。从基础设施提供的信息是一组预期的连接成本,定期更新,以反映当前的系统需求和意外的交通事故。初步分析表明,为了尽量减少通信负荷,在某些条件下,应传输所有链路成本(而不仅仅是特殊的链路成本),并应使用适当的数据压缩技术。由于改道建议是在车辆内部生成的,因此无论车辆恰好在哪里,这些建议都可能在驾驶员通过安全机动以改道的位置后出现。通过人为因素研究,评估了安全导流应允许的推荐导流路口前的安全距离。这个安全距离取决于驾驶员的特性,以及车辆和道路的特性(包括车道位置)。引导系统应设计成只向司机提供安全的改道建议。预期路径引导的扩展研究包括:1)通过交通建模和仿真预测链路成本;2)包含多种交通方式;3)与交通灯控制的协调。研究战略是为ATIS产品开发制定实用的指导方针,随着获得更多的研究成果和部件成本的变化,这些指导方针可以逐步升级。
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引用次数: 93
Emerging requirements for digital maps for in-vehicle pathfinding and other traveller assistance 用于车载寻路和其他旅客辅助的数字地图的新需求
Pub Date : 1991-10-01 DOI: 10.4271/912751
M. White
As Advanced Traveller Information Systems (ATIS) technology matures, new in-vehicle applications are arising: pathfinding, business listings ("Yellow Pages"), cartographically attractive displays, integration with Global Positioning System (GPS) technology, and communications with real-time traffic information services. Each of these impose new demands on digital maps supporting ATIS. We present examples of each and describe the nature of supporting map data. For pathfinding the following data are used: a topological database, driving restrictions, including complex multi-link turn restrictions, and street classifications used in computing impedance. More advanced and attractive graphics displays, e.g., color LCD and CRT screens, permit color fill for such areas as water bodies and parks. As a result, purely cartographic information, useful primarily for making the map display more attractive and recognizable, may become a significant portion of the map data. GPS is now widely available, and many manufacturers are including GPS receivers in their designs and prototypes. This requires, in most cases, a change in coordinate systems, for example in the US from NAD27 to WGS84. Finally, identifying particular links for communication with real-time traffic information services imposes requirements for cooperation among developers. Operating examples of these new requirements in use are presented together with a brief review of earlier requirements, including positional accuracy, street classification and geocoding support. These are needed for display, map matching navigation, as well as new applications, such as business listings searches.
随着先进的旅行者信息系统(ATIS)技术的成熟,新的车载应用正在兴起:寻路、商业列表(“黄页”)、具有地图吸引力的显示、与全球定位系统(GPS)技术的集成,以及与实时交通信息服务的通信。这些都对支持ATIS的数字地图提出了新的要求。我们给出了每一个例子,并描述了支持地图数据的性质。寻路使用以下数据:拓扑数据库,驾驶限制,包括复杂的多路转弯限制,以及用于计算阻抗的街道分类。更先进和有吸引力的图形显示,如彩色LCD和CRT屏幕,允许在水体和公园等区域进行彩色填充。因此,纯粹的制图信息(主要用于使地图显示更有吸引力和可识别性)可能成为地图数据的重要部分。GPS现在广泛使用,许多制造商在他们的设计和原型中包括GPS接收器。在大多数情况下,这需要改变坐标系,例如在美国,从NAD27到WGS84。最后,确定与实时交通信息服务通信的特定链接对开发人员之间的合作提出了要求。本文介绍了这些新要求的实际应用实例,并简要回顾了以前的要求,包括位置准确性、街道分类和地理编码支持。这些都是显示、地图匹配导航以及新应用程序(如企业列表搜索)所需要的。
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引用次数: 2
Benefits of dynamic route guidance systems as part of a future oriented city traffic management system 动态路线引导系统作为面向未来的城市交通管理系统的一部分的好处
Pub Date : 1991-10-01 DOI: 10.4271/912832
J. Sparmann
In order to better cope with the future needs of traffic management systems an advanced route guidance and information system called LISB has been introduced and tested in the City of Berlin (West) (1). Infrared transmitters and receivers (beacons) are located at intersections of the main road network transmitting route recommendations to specially equipped vehicles. These vehicles measure their travel times per road section and transmit them via beacons to a central route guidance computer. Based on actual travel times, the central computer calculates the quickest routes in the network. These routes are indicated visually and audibly to the drivers, guiding them to their destinations, taking into account the actual and short-term predicted traffic situation. Within a large-scale field experiment the system's performance, acceptance by the drivers, and benefits for the users as well as for the municipality have been investigated (2). The final results and a way of incorporating individual traffic control systems into traffic management systems will be presented in the following paper.
为了更好地应对未来交通管理系统的需求,一种名为LISB的先进路线引导和信息系统已经在柏林市(西)引入并进行了测试(1)。红外发射器和接收器(信标)位于主要道路网络的十字路口,向专门装备的车辆发送路线建议。这些车辆测量每个路段的行驶时间,并通过信标将其传输到中央路线引导计算机。根据实际出行时间,中央计算机计算出网络中最快的路线。这些路线以视觉和听觉指示司机,引导他们到达目的地,同时考虑到实际和短期预测的交通状况。在一次大规模的现场实验中,对该系统的性能、驾驶员的接受程度以及对用户和市政当局的好处进行了调查(2)。最终结果和将单个交通控制系统纳入交通管理系统的方法将在下面的论文中提出。
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引用次数: 8
A new route optimization algorithm for rapid decision support 一种新的快速决策支持路径优化算法
Pub Date : 1991-10-01 DOI: 10.4271/912818
J. Bander, C. White
We describe a new heuristic search algorithm, Interruptible A (IA), that we have implemented in a real-world decision aid for use of public transit. IA is appropriate for shortest path problems where there is value to a suboptimal path returned quickly. We offer an example in which IA returns an optimal path in single iteration, and another where the algorithm finds a suboptimal path quickly before converging to the optimal path. Two admissibility condition are presented, along with empirical results indicating that IA is effective in both admissible and inadmissible cases.
我们描述了一种新的启发式搜索算法,可中断a (Interruptible a, IA),我们已经在现实世界的公共交通决策辅助中实现了它。IA适用于存在快速返回的次优路径值的最短路径问题。我们提供了一个例子,其中IA在单次迭代中返回最优路径,以及另一个算法在收敛到最优路径之前快速找到次最优路径的例子。提出了两种可采条件,并给出了经验结果,表明IA在可采和不可采的情况下都是有效的。
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引用次数: 31
A report on the TRB IVHS communication standards workshop TRB IVHS通讯标准研讨会报告
Pub Date : 1991-10-01 DOI: 10.4271/912841
R. French, E. Case, P. Tarnoff, M. Chung
A major impediment to the widespread implementation of Intelligent Vehicle Highway Systems (IVHS) is the absence of communications standards, particularly for mobile applications. The Communications Committee of the Transportation Research Board (TRB) sponsored a Communications Workshop in June 1990 to address this problem. The Workshop was attended by representatives from all levels of government, consultants, universities and industry from the United States, Canada, Europe, and Japan. Working groups were established to address specific issues, including research requirements, international compatibility, commonality and interoperability, content and format, and processes for developing standards. Problem statements generated by the working groups formed the basis for recommended action. This paper presents a report on the workshop by the editors of TRB Transportation Research Circular "Recommendations for Establishing Intelligent Vehicle Highway Systems (IVHS) Communications Standards" to be published in the near future which contains a comprehensive record of the entire proceedings.
智能车辆公路系统(IVHS)广泛实施的一个主要障碍是缺乏通信标准,特别是针对移动应用。运输研究委员会通讯委员会于1990年6月主办了一个通讯讲习班来处理这个问题。来自美国、加拿大、欧洲和日本的各级政府、顾问、大学和工业界的代表出席了讲习班。工作组的成立是为了解决具体问题,包括研究要求、国际兼容性、共性和互操作性、内容和格式以及制定标准的过程。工作组提出的问题说明构成了建议行动的基础。本文介绍了TRB交通研究通函“建立智能车辆公路系统(IVHS)通信标准的建议”的编辑对研讨会的报告,该通函将于不久的将来出版,其中包含了整个会议的全面记录。
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引用次数: 1
Design and implementation of ADVANCE: The Illinois dynamic navigation and route guidance demonstration program ADVANCE:伊利诺伊州动态导航和路线引导演示程序的设计与实现
Pub Date : 1991-10-01 DOI: 10.4271/912786
David E. Boyce, A. Kirson, J. Schofer
A demonstration program to design, implement and evaluate an in-vehicle navigation and route guidance system with dynamically updated travel time information is being undertaken on a suburban arterial road system in Northeast Illinois. In July, 1991, the Illinois Department of Transportation, Federal Highway Administration, Motorola, Inc., and Illinois Universities Transportation Research Consortium agreed to proceed with the design and test phase of the demonstration program. This phase will design the route guidance system demonstration, implement the software design for the Traffic Information Center and conduct a system test. Detailed plans for monitoring and assessing the system's performance will also be prepared. These designs will guide the studies to be performed during the implementation phase of the demonstration program expected to commence in 1993.
伊利诺斯州东北部郊区主干道系统正在进行一个演示项目,设计、实施和评估具有动态更新旅行时间信息的车载导航和路线引导系统。1991年7月,伊利诺斯州交通运输部、联邦公路管理局、摩托罗拉公司和伊利诺斯大学交通研究联盟同意继续进行示范项目的设计和测试阶段。本阶段将设计路线引导系统演示,实现交通信息中心的软件设计,并进行系统测试。还将编制监测和评估系统性能的详细计划。这些设计将指导在预期于1993年开始的示范方案的执行阶段进行的研究。
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引用次数: 67
The effects of different in-vehicle route information displays on driver behaviour 不同车载路线信息显示对驾驶员行为的影响
Pub Date : 1991-10-01 DOI: 10.4271/912734
Andrew M. Parkes, M. C. Ashby, Steve H. Fairclough
The paper reports two experiments conducted within the Driver Behaviour and Traffic Safety research strand of the European DRIVE programme. Each experiment was conducted using members of the general public, driving specially adapted road vehicles, in real urban environments. The first experiment, conducted in Loughborough can be seen as a validation of a multi-level evaluation methodology developed within the project as applied to two modes of route information presentation: paper map or text display on LCD screen. The second experiment used similar data collection techniques, but was conducted in Berlin with two real route information systems (LISB and Bosch Travelpilot). Assessing the results of these two experiments shows that there is a greater degree of visual workload associated with drawing information off a map display. This is the result of analysing a combination of measures, including vehicle control data, physiological stress indices, visual attention data and a variety of subjective response measures. This form of information presentation may be less than compatible with the task of navigating a vehicle whilst interacting with the road infrastructures of today.
本文报告了在欧洲DRIVE计划的驾驶员行为和交通安全研究链中进行的两个实验。每个实验都是让普通大众在真实的城市环境中驾驶经过特殊改装的道路车辆进行的。在拉夫堡进行的第一个实验可以被看作是对项目中开发的多层次评估方法的验证,该方法适用于两种模式的路线信息呈现:纸质地图或LCD屏幕上的文本显示。第二个实验使用了类似的数据收集技术,但在柏林使用两个真实的路线信息系统(LISB和Bosch Travelpilot)进行。评估这两个实验的结果表明,在地图显示上绘制信息会带来更大程度的视觉工作量。这是综合分析各种措施的结果,包括车辆控制数据、生理应激指标、视觉注意数据和各种主观反应措施。这种形式的信息表示可能不太兼容导航车辆的任务,同时与今天的道路基础设施进行交互。
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引用次数: 29
期刊
Vehicle Navigation and Information Systems Conference, 1991
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