Using Connected Vehicles In Variable Speed Limit Systems

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Using Connected Vehicles In Variable Speed Limit Systems

Using Connected Vehicles In Variable Speed Limit Systems written by Ellen F. Grumert and has been published by Linköping University Electronic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-04-10 with categories.

Motorway traffic management systems are useful for improving the traffic conditions on urban motorways. One of the most common motorway traffic management systems are variable speed limit systems. These systems adapt the speed limits based on the prevailing traffic conditions measured by roadside detectors and recommended or compulsory speed limits are shown on variable message signs installed on gantries over the road.Thesystems consist of three parts; the control algorithm used to determine which speed limit to be displayed, a method for estimating the traffic conditions to be used as input for the control algorithm and the infrastructure for application of the variable speed limits. The goal of the systems is often to increase safety or efficiency. Recent development in the field of connected vehicles have opened up for a new type of data source, as the status of a connected vehicle and its surroundings can be communicated at arbitrary locations. Hence, by the use of connected vehicles in variable speed limit systems there is a potential of reducing the amount of roadside equipment. It is even possible to control the connected vehicles towards the current speed limit without the use of variable message signs. This allows for the application of variable speed limits at arbitrary locations. The aim of this thesis is to examine how connected vehicles can be used to improve the efficiency of variable speed limit systems. The thesis contribute with new and improved methods using connected vehicles in all three parts of a variable speed limit system. The suggested methods are evaluated by microscopic traffic simulation. The overall conclusion is that the use of connected vehicles in variable speed limit systems can contribute to improvements in traffic efficiency compared to existing systems. The six papers included in the thesis can be summarized as follows. First, it is shown that traditional variable speed limit systems can be effective for improving the traffic conditions on the motorway and the results can be comparable to more costly alterations by reconstruction of the infrastructure to increase the capacity. Next, the usefulness of connected vehicles for application and control of the speed limits in an existing variable speed limit system is investigated. It is concluded that the design of the control algorithm and the accuracy of the estimated traffic conditions have a great effect on the final outcome of the system. The design of the control algorithm is then examined by evaluation of a number of control algorithms with respect to safety, efficiency and environmental impacts. The main benefits and drawbacks of the algorithms are highlighted and desirable characteristics to include when designing a control algorithm are identified. In two studies, methods making use of connected vehicles for estimating the traffic conditions are proposed. The results show that connected vehicles are useful for improving the accuracy of the estimated traffic conditions through the inclusion of more detailed information and information at locations where detector measurements are not available. Finally, a variable speed limit system is proposed in which connected vehicles play a central role in the estimation of the traffic conditions, as well as in the control algorithm and for application of the speed limit. The system is shown to be useful for improving traffic efficiency during an incident at an arbitrary location along the controlled road.

Improving Intersection Safety Through Variable Speed Limits For Connected Vehicles

Improving Intersection Safety Through Variable Speed Limits For Connected Vehicles written by Michael W. Levin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Automated vehicles categories.

Autonomous vehicles create new opportunities for innovative intelligent traffic systems. Variable speed limits, which is a speed management systems that can adjust the speed limit according to traffic condition or predefined speed control algorithm on different road segments, can be better implemented with the cooperation of autonomous vehicles. These compliant vehicles can automatically follow speed limits. However, non-compliant vehicles will attempt to pass the moving bottleneck created by the compliant vehicle. This project builds a multi class cell transmission model to represent the relation between traffic flow parameters. This model can calculate flows of both compliant and non-compliant vehicles. An algorithm is proposed to calculate variable speed limits for each cell of the cell transmission model. This control algorithm is designed to reduce the stop-and-go behavior of vehicles at traffic signals. Simulation is used to test the effects of VSLs on an example network. The result shows that VSL is effective at reducing the energy consumption of the whole system and reduce the likelihood of crash occurrence.

Variable Speed Limit System Cost Benefit Analysis

Variable Speed Limit System Cost Benefit Analysis written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Highway communications categories.

The variable speed limit (VSL) system is designed to display both the maximum and minimum speed boundaries based on measured traffic and environmental conditions. In addition, short driver information messages can be displayed to warn of downstream conditions. The VSL can be installed to operate independently (Isolated), in a series of stations (Linked), as a component of a larger management system (Integrated), and in the future as part of an "In-Vehicle" component to provide all types of driver information (In-Vehicle). This analysis compares the four types of VSL systems to the existing "fixed" speed limit system which can display only one speed for all conditions

Potential Connected Vehicle Applications To Enhance Mobility Safety And Environmental Security

Potential Connected Vehicle Applications To Enhance Mobility Safety And Environmental Security written by Xiaosi Zeng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Intelligent transportation systems categories.

Preparations For Field Testing Of Combined Variable Speed Advisory Vsa And Coordinated Ramp Metering Crm For Freeway Traffic Control

Preparations For Field Testing Of Combined Variable Speed Advisory Vsa And Coordinated Ramp Metering Crm For Freeway Traffic Control written by Xiao-Yun Lu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Electronic traffic controls categories.

The Street Railway Journal

The Street Railway Journal written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1890 with Electric railroads categories.

Strategic Issues Facing Transportation

Strategic Issues Facing Transportation written by Paul Sorensen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with State transportation agencies categories.

Preparing State Transportation Agencies for an Uncertain Energy Future /

Legal Research Digest

Legal Research Digest written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Highway law categories.

Railway And Engineering Review

Railway And Engineering Review written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1900 with Railroads categories.

Transportation Research Record

Transportation Research Record written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Air travel categories.

"For more than 50 years, the Transportation Research Record has been internationally recognized as one of the preeminent peer-reviewed journals for transportation research papers from authors in the United States and from around the world. One of the most cited transportation journals, the TRR offers unparalleled depth and breadth in the coverage of transportation topics from both academic and practitioner perspectives. All modes of passenger and freight transportation are addressed in papers covering a wide array of disciplines, including policy, planning, administration, economics and financing, operations, construction, design, maintenance, safety, and more."--Publisher's website