Transit Signal Priority Along Arterials Using Advanced Detection

2003 ◽  
Vol 1856 (1) ◽  
pp. 220-230 ◽  
Author(s):  
Yann Wadjas ◽  
Peter G. Furth
Keyword(s):  
Control Strategies ◽  
Traffic Density ◽  
Light Rail ◽  
Transit Signal Priority ◽  
Adaptation Algorithm ◽  
Peer Communication ◽  
Length Estimation ◽  
Rail Line ◽  
Peak Travel ◽  
Green Period

This research developed and tested the concept of advanced detection and cycle length adaptation as a strategy for providing priority for transit vehicles. In a departure from control strategies that rely on detection only a few seconds in advance of the stopline, a control algorithm was developed in which transit vehicles are detected two to three cycles in advance of their arrival at an intersection stopline, and phase lengths were then constrained so that the transit-serving phase was green for a 40-s predicted arrival window. Methods were developed for selecting whether to extend or compress phase lengths to shift a green period to cover the arrival window. Adaptive control was combined with actuated control using traffic density and queue length estimation, transit stopline actuation, and peer-to-peer communication for coordination in the peak travel direction. The method was applied by simulation to Boston, Massachusetts’ Huntington Avenue corridor, which is served by a light-rail line running partly in mixed traffic and partly in a median reservation. The prediction/adaptation algorithm resulted in 82% of the trains arriving during the green phase. This control strategy resulted in substantial improvements to transit travel time and regularity with negligible impacts on private traffic and pedestrians, and was found to be more effective than simple preemption.

scholarly journals Evaluasi Teknis Rencana Jalur Light Rail Transit (LRT) Di Wilayah Bandung Raya

2020 ◽  
Vol 2019 (1) ◽  
Author(s):  
Tessalonika Natalia Djie ◽  
Sumarno Sumarno
Keyword(s):  
Geometric Analysis ◽  
High Population ◽  
Light Rail ◽  
Rail Transit ◽  
Light Rail Transit ◽  
Horizontal Curve ◽  
West Java ◽  
Rail Line ◽  
Technical Evaluation

ABSTRAKLight Rail Transit (LRT) kini menjadi salah satu sarana transportasi darat yang sedang direncanakan untuk memenuhi kebutuhan transportasi pada suatu kota yang memiliki tingkat kepadatan penduduk yang tinggi. Di wilayah Bandung Raya telah ada rencana jalur LRT yang disusun oleh Dinas Perhubungan Provinsi Jawa Barat yang terdiri atas delapan koridor. Pada penelitian ini dilakukan evaluasi teknis rencana jalur LRT khususnya pada koridor-1 (Leuwi Panjang–Jatinangor) dan koridor-4 (Leuwi Panjang– Babakan Siliwangi). Tujuan dari penelitian ini adalah mengevaluasi tingkat kesesuaiannya dengan persyaratan teknis jalur kereta api, khususnya terhadap aspek geometrik yaitu kelandaian dan kelengkungan. Evaluasi dilakukan dengan melakukan analisis geometrik pada rencana jalur LRT dengan persyaratan teknis jalur kereta api terhadap lima kelas jalan rel. Berdasarkan hasil analisis diketahui bahwa pada koridor-1 sudah memenuhi persyaratan kelandaian dan lengkung horizontal untuk semua kelas, sedangkan koridor-4 belum memenuhi persyaratan tersebut.Kata Kunci: Light Rail Transit (LRT), kelandaian, lengkung horizontalABSTRACTLight Rail Transit (LRT) now become one of transportation means to fullfil the need of transportation in one of regions which is having high population. In Bandung Raya region, there were plans of LRT line which is arranged by Dinas Perhubungan West Java Province which consist of eight coridors. This research has done the technical evaluation for planning the LRT especially on corridor-1 (Leuwi Panjang- Jatinangor) and corridor-4 (Leuwi Panjang-Babakan Siliwangi). The aim of this reasearch is to evaluate the appropriateness levels with the rules and regulations of train technical lines, especially on the aspec of geometric including slope and horizontal curve. The evaluation is done by doing geometric analysis in the plan of LRT line with rules and regulations of train technical line toward five classes of rail line. Based on the result of analysis, it can be revealed that corridor-1 has been fullfil the rules and regulations of slope and horizontal curve for every classes, while corridor-4 do not fullfil the rules and regulations yet.Keywords: Light Rail Transit (LRT), slope, horizontal curve

Simulation-Based Comparison of Holding Strategies for a Multibranch Light Rail Service

2017 ◽  
Vol 2648 (1) ◽  
pp. 23-32 ◽  
Author(s):  
Joshua J. Fabian ◽  
Gabriel E. Sánchez-Martínez
Keyword(s):  
Control Point ◽  
Light Rail ◽  
Massachusetts Bay ◽  
Real Time Control ◽  
Time Control ◽  
Special Events ◽  
Simulation Based ◽  
Transit Services ◽  
Rail Line ◽  
Demand Variability

Light rail transit services face many operational challenges, such as capacity constraints, mixed-traffic interference, and branch junctions. The service plans developed for these lines typically specify a precise schedule for each vehicle. Running time and demand variability, special events, and incidents make it challenging to adhere to schedules. Operators can enact real-time control actions to mitigate delays. This research compared the effectiveness of schedule- and headway-based holding strategies applied en route and at terminals (i.e., dispatching) on a simulation model of the Massachusetts Bay Transportation Authority Green Line, a four-branch light rail line. The effects of control point placement at terminals, along branches, along a central trunk, and in combinations of these three were studied, as were the effects of limiting holding at midroute stations. Holding strategies were compared on the basis of service and passenger-oriented performance. Headway-based holding was found to be a more effective method for ensuring that passengers experienced reasonable wait times within scheduled headways. Holding at terminals appeared to be the most beneficial to passengers; additional holding along the branches and limited holding along the trunk were shown to enhance these benefits. Holding only within the trunk of a multibranch service worsened service because of blockages from held trains.

scholarly journals Construction of a Light Rail line to Wilanów

2016 ◽  
Vol 2016 (7) ◽  
pp. 9-16
Author(s):  
Grzegorz Madrjas
Keyword(s):  
Feasibility Studies ◽  
Light Rail ◽  
Historical Aspects ◽  
Main Design ◽  
Rail Line ◽  
Design Ideas ◽  
Design Challenges

The paper describes main design ideas for a project of a tramway connection between districts of Warsaw: Wola, Ochota, Mokotów and Wilanów. Historical aspects, main spatial documents as well as feasibility studies are also discussed. Moreover, key design challenges are presented which concern routing options and limitations of passing through special locations.

Risk Comparison of Transporting Hazardous Materials in Unit Trains versus Mixed Trains

2017 ◽  
Vol 2608 (1) ◽  
pp. 134-142 ◽  
Author(s):  
Xiang Liu
Keyword(s):  
Decision Support Tool ◽  
Hazardous Materials ◽  
Rolling Stock ◽  
Traffic Density ◽  
Support Tool ◽  
Hazardous Materials Transportation ◽  
Traffic Demand ◽  
Transportation Risk ◽  
Rail Line ◽  
Train Length

This research developed an integrated, generalized risk analysis methodology for comparing hazardous materials transportation risk in unit trains versus mixed trains for the same amount of traffic demand. The risk methodology accounted for FRA track class, method of operation, annual traffic density, train length, speed, point of derailment, the number and placement of tank cars in a train, tank car placement, tank car safety design, and population density along the rail line. With these inputs, the methodology estimates train derailment rate, the probability of tank car derailment and release, and release consequence by train configuration. The analysis showed that tank car positions could affect the risk comparison between unit trains and mixed trains in transporting hazardous materials. In particular, if all tank cars were in positions that were least prone to derailment, distributing tank cars to many unit trains could reduce the overall risk. Otherwise, consolidating tank cars into unit trains could lead to a lower risk. The methodology has been implemented in a computer-aided decision support tool that automatically calculates the risk values for various track, rolling stock, and operational characteristics.

Can compact rail transit corridors transform the automobile city? Planning for more sustainable travel in Los Angeles

Urban Studies ◽  
2014 ◽  
Vol 52 (5) ◽  
pp. 938-959 ◽  
Author(s):  
Douglas Houston ◽  
Marlon G Boarnet ◽  
Gavin Ferguson ◽  
Steven Spears
Keyword(s):  
Los Angeles ◽  
City Planning ◽  
Light Rail ◽  
Rail Transit ◽  
Transit Oriented Development ◽  
Survey Analysis ◽  
Transit Ridership ◽  
Mixed Use ◽  
Development Context ◽  
Rail Line

Directing growth towards compact rail corridors has become a key strategy for redirecting auto-oriented regions towards denser, mixed-use communities that support sustainable travel. Few have examined how travel of near-rail residents varies within corridors or whether corridor land use–travel interactions diverge from regional averages. The Los Angeles region has made substantial investments in transit-oriented development, and our survey analysis indicates that although rail corridor residents drove less and rode public transit more than the county average, households in an older subway corridor with more near-transit development had about 11 fewer daily miles driven and higher transit ridership than households along a newer light rail line, a difference likely associated with development patterns and the composition and preferences of residents. Rail transit corridors are not created equally, and transit providers and community planners should consider the social and development context of corridors in efforts to improve transit access and maximise development.

Integrated Real-Time Transit Signal Priority Control for High-Frequency Segregated Transit Services

2015 ◽  
Vol 2533 (1) ◽  
pp. 28-38 ◽  
Author(s):  
Felipe Delgado ◽  
Juan Carlos Muñoz ◽  
Ricardo Giesen ◽  
Nigel H. M. Wilson
Keyword(s):  
Real Time ◽  
Control Strategy ◽  
High Frequency ◽  
Control Strategies ◽  
Transit Signal Priority ◽  
Operational Conditions ◽  
Traffic Lights ◽  
Wide Range ◽  
Transit Services ◽  
Capacity Constrained

Bus bunching affects transit operations by increasing passenger waiting time and variability. To tackle this phenomenon, a wide range of control strategies has been proposed. However, none of them have considered station and interstation control together. In this study station and interstation control were tackled to determine the optimal vehicle control strategy for various stops and traffic lights in a single service transit corridor. The strategy minimized the total time that users must devote to making a trip, taking into account delays for transit and general traffic users. Based on a high-frequency, capacity-constrained, and unscheduled service (no timetable) for which real-time information about bus position (GPS) and bus load (automated passenger counter) is available, this study focused on strategies for traffic signal priority in the form of green extension considered together with holding buses at stops and limiting passenger boarding at stops. The decisions on transit signal priority were made according to a rolling horizon scheme in which effects over the whole corridor were considered in every single decision. The proposed strategy was evaluated in a simulated environment under different operational conditions. Results showed that the proposed control strategy achieves reductions in the excess delay for transit users close to 61.4% compared with no control, while general traffic increases only by 1.5%.

scholarly journals Transit Rider Body Mass Index Before and After Completion of Street Light-Rail Line in Utah

2017 ◽  
Vol 107 (9) ◽  
pp. 1484-1486 ◽  
Author(s):  
Barbara B. Brown ◽  
Ken R. Smith ◽  
Wyatt A. Jensen ◽  
Doug Tharp
Keyword(s):  
Body Mass Index ◽  
Body Mass ◽  
Light Rail ◽  
Before And After ◽  
Rail Line

scholarly journals Optimization Model for Rail Line Crossover Design Considering the Cost of Delay

2021 ◽  
pp. 036119812110624
Author(s):  
Willem Trommelen ◽  
Konstantinos Gkiotsalitis ◽  
Eric C. van Berkum
Keyword(s):  
Nonlinear Model ◽  
Optimization Model ◽  
Fixed Number ◽  
Crossover Design ◽  
Light Rail ◽  
Optimal Selection ◽  
Rail Line ◽  
Additional Costs ◽  
The Cost

In this study, we introduce a method to optimally select the crossover locations of an independent rail line from a set of possible crossover locations considering a fixed number of crossovers that must be used in the design. This optimal selection aims to minimize the cost of passenger delay. Previous research showed that including passenger delay in the decision of rail design choices could be beneficial from economic and societal perspectives. However, those studies were only able to evaluate a few alternatives, because the degraded schedules had to be determined manually. In this research, we introduced an integer nonlinear model to find the best crossover design. We further developed an algorithm to evaluate a set of crossovers and determine the cost of delays for all segments on a rail line given a set of potential disruptions. The monetized cost of passenger delays was used to analyze the tradeoff between the unreliability costs emerging from the delay of passengers in the case of disruptions, and the total number of required crossovers. Our model was applied on a light rail line in Bergen (Norway) resulting in 10% reduction in relation to passenger delays without increasing the number of crossovers; thus, ensuring that there were no additional costs.

Transit ridership prediction of Changchun light rail line 3

2015 ◽  
Author(s):  
Jie Li ◽  
Xingyi Shi ◽  
Zhixia Jiang ◽  
Yongxing Li ◽  
Hongfei Jia
Keyword(s):  
Light Rail ◽  
Transit Ridership ◽  
Rail Line
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