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Development And Evaluation Of Transit Signal Priority Strategies With Physical Queue Models
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Book Synopsis Development and Evaluation of Transit Signal Priority Strategies with Physical Queue Models by : Lefei Li
Download or read book Development and Evaluation of Transit Signal Priority Strategies with Physical Queue Models written by Lefei Li and published by . This book was released on 2006 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the rapid growth in modern cities and congestion on major freeways and local streets, public transit services have become more and more important for urban transportation. As an important component of Intelligent Transportation Systems (ITS), Transit Signal Priority (TSP) systems have been extensively studied and widely implemented to improve the quality of transit service by reducing transit delay. The focus of this research is on the development of a platform with the physical queue representation that can be employed to evaluate and/or improve TSP strategies with the consideration of the interaction between transit vehicles and queues at the intersection. This dissertation starts with deterministic analyses of TSP systems based on a physical queue model. A request oriented TSP decision process is then developed which incorporates a set of TSP decision regions defined on a time-space diagram with the physical queue representation. These regions help identify the optimal detector location, select the appropriate priority control strategy, and handle the situations with multiple priority requests. In order to handle uncertainties in TSP systems arising in bus travel time and dwell time estimation, a type-2 fuzzy logic forecasting system is presented and tested with field data. Type-2 fuzzy logic is very powerful in dealing with uncertainty. The use of Type-2 fuzzy logic helps improve the performance of TSP systems. The last component of the dissertation is the development of a Colored Petri Net (CPN) model for TSP systems. With CPN tools, computer simulation can be performed to evaluate various TSP control strategies and the decision process. Examples for demonstrating the process of implementing the green extension strategy and the proposed TSP decision process are presented in the dissertation. The CPN model can also serve as an interface between the platform developed in this dissertation and the implementation of the control strategies at the controller level.
Book Synopsis Development and Evaluation of Transit Signal Priority Strategies by : Michael Garrow
Download or read book Development and Evaluation of Transit Signal Priority Strategies written by Michael Garrow and published by . This book was released on 1997 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transit Signal Priority Project, Phase II by : Hesham Rakha
Download or read book Transit Signal Priority Project, Phase II written by Hesham Rakha and published by . This book was released on 2006 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transit Signal Priority (TSP) is recognized as an emerging technology that is capable of enhancing traditional transit services. Basic green-extension TSP was implemented on U.S. Route 1 in the Northern Virginia Area (or Washington, DC metropolitan area). This study quantifies the impact of TSP technology on transit-vehicle performance using field-collected Global Positioning System (GPS) data and evaluates the system-wide benefits of TSP operations using computer simulations to expand on the field evaluation study. The field study demonstrated that overall travel-time improvements in the order of 3% to 6% were observed for TSP-operated buses. However, the results also demonstrated that green-extension TSP can increase transit-vehicle travel times by approximately 2.5% during congested morning peak periods. In addition, the study demonstrated that TSP strategies reduce transit-vehicle intersection delay by as much as 23%. The field study demonstrated that the benefits associated with TSP were highly dependent on the roadway level of congestion and were maximized under moderate to low levels of congestion. However, the simulation results indicated that TSP did not result in statistically significant changes in auto or system-wide travel times (differences less than 1%). Furthermore, a paired t-test concluded that basic green-extension TSP did not increase side-street queue lengths. An increase in the traffic demand along Route 1 resulted in increased system-wide detriments; however, these detriments were minimal (less than 1.37%). The study demonstrated that an increase in side-street demand did not result in any statistically significant system-wide detriments. Increasing the frequency of transit vehicles resulted in additional benefits to transit vehicles (savings in transit vehicle travel times by up to 3.42%), but no system-wide benefits were observed. Finally, TSP operations at near-side bus stops (within the detection zone) resulted in increased delays in the range of 2.85%, while TSP operations at mid-block and far-side bus stops resulted in network-wide savings in delay in the range of 1.62%. Consequently, we recommend not implementing TSP in the vicinity of near-side stops that are located within the TSP detection zone. The simulation results indicated that a TSP system generally benefits transit vehicles, but does not guarantee system-wide benefits. In this study, a maximum transit vehicle travel-time savings of 3% to 6% was observed with the provision of green-extension TSP from both the field and simulation evaluation studies. However, the green-extension TSP operation did not benefit nor damage the non-transit vehicles in most cases. Also, it should be noted that the results of the study may be specific to Route 1 corridor because of the unique characteristics of the study corridor, the specific traffic demand, and TSP logic implemented. Finally, the study recommends the calibration of current TSP settings to improve the effectiveness of TSP operation. Also, different transit priority strategies or a combination of other TSP strategies should be investigated to increase the benefits of TSP operations. A conditional TSP system that only provides priority to transit vehicles behind schedule and an intelligent transit monitoring system are also recommended to improve the TSP system on the Route 1 corridor.
Book Synopsis Evaluation of Transit Signal Priority Strategies for Small-medium Cities by : Kiel Roger Ova
Download or read book Evaluation of Transit Signal Priority Strategies for Small-medium Cities written by Kiel Roger Ova and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transit Signal Priority Evaluation by Micro-Simulation by : Faisal Mahmud
Download or read book Transit Signal Priority Evaluation by Micro-Simulation written by Faisal Mahmud and published by LAP Lambert Academic Publishing. This book was released on 2011-03 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transit Signal Priority is an operational strategy that eases the movement of transit vehicles such as buses, light rail or streetcars, through traffic-signal controlled intersections. The benefits of TSP operations include better schedule adherence and improved transit travel times with minimal impact to normal traffic operations. In this book, a portion of the new Tide Light Rail Transit (LRT) system in Norfolk, Virginia, USA is modeled and evaluated. In order to model and evaluate the TSP operations, a micro-simulation model for the network is created in VISSIM. By using the Ring Barrier Controller (RBC) emulator within VISSIM, the control logic for TSP and No TSP scenarios is created.The analysis and context of the book is helpful to the professionals and students, especially those in the field of urban planning and transportation engineering, or anyone else who may be considering utilizing TSP logic for learning and research efforts. As the book contains in detail experimental results analyses as well as real life field scenario implementation, it will be a drafting tool to gaining knowledge about transit signal priority.
Book Synopsis Transit Preferential Treatments at Signalized Intersections by : Yashar Zeiynali Farid
Download or read book Transit Preferential Treatments at Signalized Intersections written by Yashar Zeiynali Farid and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Efficient public transportation has the potential to relieve traffic congestion and improve overall transportation system performance. In order to improve transit services, Transit Preferential Treatments (TPT) are often deployed to give transit vehicles priority over other vehicles at an intersection or along a corridor. Examples of such treatments are exclusive bus lanes, queue jumper lanes, and signal priority strategies. The objective of this study is threefold: 1) perform a person-based evaluation of alternative TPTs when considered individually and in combination, 2) develop a bus travel time prediction model along a signalized arterial, and 3) develop a real-time signal control system, which minimizes total person delay at an isolated intersection accounting for stochasticity in transit vehicle arrivals. This study first develops analytical models to estimate person delay and person discharge flow when various spatial and time TPTs are present at signalized intersections with and without near-side bus stops. This part of the research has contributed to the modeling of traffic along signalized arterials by improving the previous models to evaluate various TPT strategies with and without nearside bus stops. Next, a robust method to predict bus travel time along a signalized arterial is developed. This part of the research contributes to the bus travel time prediction models by estimating the status of traffic signals using automated vehicle location (AVL) data. The model decomposes bus travel time along signalized arterials and infers trajectories of the transit vehicles. Finally, the real-time signal control system is developed to provide priority to transit vehicles by assigning weights to transit vehicle delays based on their passenger occupancies as part of the optimization objective function. The system optimizes the movements by minimizing total person delay at the intersection. The system estimates bus arrival time at the intersection stopline and uses the developed analyitical models in the first part of the research to evaluate the person delay measure. This part of the research contributes to the real-time signal control systems by providing a priority window to account for the stochasticity in bus arrival times.
Book Synopsis Development of Dynamic Real-time Integration of Transit Signal Priority in Coordinated Traffic Signal Control System Using Genetic Algorithms and Artificial Neural Networks by : Mohammad Shareef Ghanim
Download or read book Development of Dynamic Real-time Integration of Transit Signal Priority in Coordinated Traffic Signal Control System Using Genetic Algorithms and Artificial Neural Networks written by Mohammad Shareef Ghanim and published by . This book was released on 2008 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transit Signal Priority Strategies by : Ahmad Alrashidan
Download or read book Transit Signal Priority Strategies written by Ahmad Alrashidan and published by . This book was released on 2018 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Transit Signal Priority (TSP) system's fundamental job is to give priority to transit vehicles enabling faster passage through signalized intersections. Through a system that responds to transit vehicles approaching an intersection, green phase extension or red truncation is granted to minimize transit travel time. With emerging technologies TSP has the potential of doing so without disturbing general traffic flows. In this dissertation, an evaluation of the overall state of practice for TSP is conducted to upgrade the quality of TSP. Certain parameters were found to be significant in TSP performance, like: transit occupancies, transit arrival times, traffic volume, network capacity, system quality and green time. These multiple parameters affecting TSP performance from various studies are gathered and tested in three different cases: 1) Isolated intersection, 2) Main corridor with cross-streets and 3) Case study: Austin downtown network. This study focused on developing different TSP response scenarios to test what is the best way to handle bus requests. These scenarios represent the three TSP system types: passive, active and adaptive. By creating multiple scenarios, the goal is to develop technology that will minimize bus delays while also minimizing effects on general traffic delays.
Book Synopsis Design and Implementation of Transit Priority at Signalized Intersections by : Canadian Urban Transit Association
Download or read book Design and Implementation of Transit Priority at Signalized Intersections written by Canadian Urban Transit Association and published by . This book was released on 2000 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development and Implementation of an Adaptive Transit Signal Priority Strategy in Microscopic Simulation by : Xu Han
Download or read book Development and Implementation of an Adaptive Transit Signal Priority Strategy in Microscopic Simulation written by Xu Han and published by . This book was released on 2014 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transit Signal Priority (TSP) strategies are widely used to reduce bus travel delay and improve bus service performance. State-of-the-art TSP strategies help buses cross intersections without stopping, either by green extension or red truncation, and enable adaptive TSP plans that reflect real-time traffic conditions. Among all existing adaptive TSP strategies, there are two types of approaches: 1) objective function-based optimization; 2) logic and (or) rule-based optimization. This thesis develops an adaptive TSP strategy via the objective-function approach. The key contributions include an accurate bus delay estimation model, which implements an adaptive TSP strategy into a programming problem, and an adaptive TSP simulation platform, which uses a full-scale signal emulator, ASC/3, in VISSIM. A case study in VISSIM is conducted to evaluate the proposed adaptive TSP strategy versus conventional TSP strategies. Finally, the proposed TSP is compared with previous studies to investigate advantages and disadvantages.
Book Synopsis A Method for Evaluating and Prioritizing Candidate Intersections for Transit Signal Priority Implementation by : Zeeshan Raza Abdy
Download or read book A Method for Evaluating and Prioritizing Candidate Intersections for Transit Signal Priority Implementation written by Zeeshan Raza Abdy and published by . This book was released on 2010 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transit agencies seeking to improve transit service delivery are increasingly considering the deployment of transit signal priority (TSP). However, the impact of TSP on transit service and on the general traffic stream is a function of many factors, including intersection geometry, signal timings, traffic demands, TSP strategies and parameters, transit vehicle headways, timing when transit vehicles arrive at the intersection, etc. Previous studies have shown that depending on these factors, the net impact of TSP in terms of vehicle or person delay can be positive or negative. Furthermore, due to financial constraints, transit agencies are often able to deploy TSP at only a portion of all of the candidate intersections. Consequently, there is a need to estimate the impact of TSP prior to implementation in order to assist in determining at which intersections TSP should be deployed. Currently, the impacts of TSP are often estimated using microscopic simulation models. However, the application of these models is resource intensive and requires specialized expertise that is often not available in-house to transit agencies. In this thesis, an analytical model was proposed for estimating the delay impacts of green extension and early green (red truncation) TSP strategies. The proposed model is validated with analytical model reported in the literature and microscopic simulation model. This is followed by model sensitivity analysis. A software module is developed using the proposed model. The usefulness of the model is illustrated through its application to estimate the TSP performance. Finally, a prioritization is conducted on sixteen intersections with different geometric and operational traffic strategies. The overall results indicate that the proposed model is suitable for both estimating the pre-deployment and post-deployment TSP performance. The proposed model is suitable for implementation within a spreadsheet and requires considerably less effort, and less technical expertise, to apply than a typical micro-simulation model and therefore is a more suitable tool for transit agencies to use for prioritising TSP deployment.
Book Synopsis Modeling and Evaluation of Conditional Transit Signal Priority on Large Scale Networks by : Jihong Chen
Download or read book Modeling and Evaluation of Conditional Transit Signal Priority on Large Scale Networks written by Jihong Chen and published by . This book was released on 2006 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: A framework for modeling and testing Conditional Transit Signal Priority CTSP strategies has been presented. A Hybrid simulation tool has been used to evaluate the regional impacts of Transit Signal Priority (TSP) and various CTSP strategies. A large scale model of the Chicago area has been used to capture the impacts of TSP and CTSP implementation on intersecting and parallel corridors.
Book Synopsis Comprehensive Evaluation on Transit Signal Priority System Impacts Using Field Observed Traffic Data (phase One) by : Yinhai Wang
Download or read book Comprehensive Evaluation on Transit Signal Priority System Impacts Using Field Observed Traffic Data (phase One) written by Yinhai Wang and published by . This book was released on 2007 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Transit Signal Priority Strategies for Bus Rapid Transit Project on 3500 South Street in Salt Lake County, Utah by : Aleksandar Stevanovic
Download or read book Evaluation of Transit Signal Priority Strategies for Bus Rapid Transit Project on 3500 South Street in Salt Lake County, Utah written by Aleksandar Stevanovic and published by . This book was released on 2013 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bus Rapid Transit (BRT) is becoming one of the most popular transit services in the United States. BRT is a viable option for many cities and can offer commuters travel times comparable to those experienced in private cars. With about 100 miles of BRT service scheduled for deployment in future years, Utah Transit Authority (UTA) for the first time is facing questions related to BRT service. How will the service interact with private traffic? Will passengers accept unfamiliar features of the new service? We looked at the new BRT deployment in West Valley City, Salt Lake County, UT. Lacking BRT operational data from the field, but with a need to estimate operational challenges before the actual implementation, we used estimates generated from a microsimulation model. In addition, a series of surveys were conducted to gain feedback from the users of the BRT system. Results from the microsimulation runs show that the new BRT line leads to significant improvements of transit operations, with reductions of close to 20% in travel times and 40% in dwell times. An additional transit signal priority (TSP) feature is estimated to reduce travel times another 15%. The results showed that TSP has minor negative impact on side-street traffic and no impact or minor positive impact on main traffic. Results from the surveys show a high degree of acceptance of the new MAX buses among passengers and drivers. In short, the first BRT system in Utah can be qualified as another success story for the BRT systems in the United States.
Book Synopsis Modeling of Traffic Signal Control and Transit Signal Priority Strategies in a Microscopic Simulation Laboratory by : Angus Putnam Davol
Download or read book Modeling of Traffic Signal Control and Transit Signal Priority Strategies in a Microscopic Simulation Laboratory written by Angus Putnam Davol and published by . This book was released on 2001 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Bus Priority Strategies in Coordinated Traffic Signal Systems by :
Download or read book Evaluation of Bus Priority Strategies in Coordinated Traffic Signal Systems written by and published by . This book was released on 2014 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bus Signal Priority Strategies written by and published by . This book was released on 1980 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
