Computer-Aided Scheduling and Dispatch in Demand-Responsive Transit Services

2004 ◽  
Author(s):  
◽  
Keyword(s):  
Computer Aided ◽  
Transit Services ◽  
Demand Responsive Transit

A Simulation Study to Derive the Optimal Cycle Length for Feeder Transit Services

2013 ◽  
pp. 142-162
Author(s):  
Shailesh Chandra ◽  
Chung-Wei Shen ◽  
Luca Quadrifoglio
Keyword(s):  
Simulation Study ◽  
Cycle Length ◽  
Target Area ◽  
Survey Questionnaire ◽  
Residential Areas ◽  
Transportation Services ◽  
Feeder Transit ◽  
Transit Services ◽  
Potential Demand ◽  
Demand Responsive Transit

This paper presents a simulation study to evaluate the capacity and the optimum service cycle time of a demand responsive transit “feeder” service within the colonia of El Cenizo, TX. Demand data are taken from a survey questionnaire conducted to evaluate the existing travel patterns and the potential demand for a feeder service. Results showed that a single shuttle would be able to comfortably serve 150 passengers per day and that a fleet of 7-8 vehicles would be needed to serve the residential area. The optimal cycle length between consecutive departures from the terminal should be between 11-13 minutes for best service quality. This exploratory study can serve as a first step towards improving transportation services within these growing underprivileged communities, but also other residential areas, especially those with demographics and geometry similar to our target area of El Cenizo.

scholarly journals Service Quality Assessment of App-Based Demand-Responsive Public Transit Services in Lahore, Pakistan

2021 ◽  
Vol 11 (4) ◽  
pp. 1911 ◽  
Author(s):  
Muhammad Abdullah ◽  
Nazam Ali ◽  
Syed Arif Hussain Shah ◽  
Muhammad Ashraf Javid ◽  
Tiziana Campisi
Keyword(s):  
Factor Analysis ◽  
Public Transport ◽  
Questionnaire Survey ◽  
Positive Impact ◽  
Web Based ◽  
Policy Makers ◽  
Transit Services ◽  
Bus Services ◽  
Demand Responsive Transit ◽  
Insight Into

App-based demand-responsive transit (DRT) services are emerging where conventional public transport is unable to meet the demand. SWVL (choice A) and Airlift (choice B) are two such DRT bus services operating in Lahore, Pakistan. It is important for the policy makers and operators to evaluate the satisfaction levels of the passengers using these services. This study evaluated passengers’ satisfaction regarding choice A and choice B through a questionnaire survey. A total of 440 responses were collected from the users of the DRT services through personal interviews and a web-based approach. Factor analysis on the collected data produced two underlying factors, namely service-attributes and bus ambiance. Ordinal regression showed that the service-attributes and ambiance were significant predictors of overall satisfaction levels about choice A. Service-attributes indicated a larger positive impact on overall satisfaction with choice A as compared to ambiance. Although the ordinal model for choice B fitted the data well, the predictors were found to be insignificant. The results offer an insight into which predictors affect the overall satisfaction and how it can be improved.

A Simulation Study to Derive the Optimal Cycle Length for Feeder Transit Services

2011 ◽  
Vol 3 (3) ◽  
pp. 27-46 ◽  
Author(s):  
Shailesh Chandra ◽  
Chung-Wei Shen ◽  
Luca Quadrifoglio
Keyword(s):  
Simulation Study ◽  
Cycle Length ◽  
Target Area ◽  
Survey Questionnaire ◽  
Residential Areas ◽  
Transportation Services ◽  
Feeder Transit ◽  
Transit Services ◽  
Potential Demand ◽  
Demand Responsive Transit

This paper presents a simulation study to evaluate the capacity and the optimum service cycle time of a demand responsive transit “feeder” service within the colonia of El Cenizo, TX. Demand data are taken from a survey questionnaire conducted to evaluate the existing travel patterns and the potential demand for a feeder service. Results showed that a single shuttle would be able to comfortably serve 150 passengers per day and that a fleet of 7-8 vehicles would be needed to serve the residential area. The optimal cycle length between consecutive departures from the terminal should be between 11-13 minutes for best service quality. This exploratory study can serve as a first step towards improving transportation services within these growing underprivileged communities, but also other residential areas, especially those with demographics and geometry similar to our target area of El Cenizo.

scholarly journals A Methodology for Choosing between Route Deviation and Point Deviation Policies for Flexible Transit Services

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Yue Zheng ◽  
Wenquan Li ◽  
Feng Qiu
Keyword(s):  
Real Life ◽  
Analytical Models ◽  
User Cost ◽  
Residential Areas ◽  
Transit Systems ◽  
Transit Services ◽  
Cost Efficient ◽  
Service Policies ◽  
Demand Responsive Transit

Flexible transit services, which bring together the characteristics of fixed-route transit and demand-responsive transit, have been proven to be cost-efficient in low-density residential areas. In this paper, a methodology is proposed to assist planners in making better decisions when choosing between route deviation policy and point deviation policy, which are two promising types of flexible transit services. A user cost function is developed to measure the service quality of the transit systems, and analytical models are constructed to compare the system performance under both expected and unexpected demand levels. Based on the experiments for various scenarios over a real-life transit example, the critical demands, which represent the switching point between the two competing service policies, have been derived. Our findings show that point deviation policy is more efficient at low-demand levels, while route deviation policy is a better choice at low-to-moderate demand levels. At unexpectedly high demand levels, route deviation policy is better able to accommodate rejected passengers than point deviation policy.

scholarly journals Evaluating demand responsive transit services using a density-based trip rate metric

2021 ◽  
Vol 14 (1) ◽  
pp. 499-519
Author(s):  
Benjamin Kaufman ◽  
Abraham Leung ◽  
Matthew Burke
Keyword(s):  
Cost Efficiency ◽  
Service Provision ◽  
Current Data ◽  
Low Density ◽  
Key Factors ◽  
Data Limitations ◽  
Service Areas ◽  
Transit Services ◽  
Widespread Availability ◽  
Demand Responsive Transit

Demand responsive transit (DRT) is attracting increased attention as a means to provide public transit to low-density populations. This research aims to provide a suite of evaluation metrics with low data requirement and widespread availability, so that operators, funders, regulators, and practitioners can better evaluate the performance of DRT services. Trip numbers can be divided by a number of available variables (period, trip length, population, and density) to create a number of derived metrics. By applying these variables across three different DRT service areas in Logan City, Australia, where other key factors are held constant, one can see how different formulations lead to very different readings of DRT system performance. The results confirm the dilemma of cost efficiency versus equity in service provision in low-density environments. This paper also highlights current data limitations and calls for better data collection to facilitate the development of new evaluation methods for DRT services and a new composite metric that can be used for inter-service comparison.

Computer-aided methods for 3-D visualization of serial sections and thick biological specimens

1992 ◽  
Vol 50 (2) ◽  
pp. 1060-1061
Author(s):  
Mark Ellisman ◽  
Maryann Martone ◽  
Gabriel Soto ◽  
Eleizer Masliah ◽  
David Hessler ◽  
...  
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Three Dimensional ◽  
Neuritic Plaque ◽  
Dimensional Structure ◽  
Data Sets ◽  
Molecular Physiology ◽  
Research Activities ◽  
Computer Aided ◽  
Dimensional Reconstruction

Structurally-oriented biologists examine cells, tissues, organelles and macromolecules in order to gain insight into cellular and molecular physiology by relating structure to function. The understanding of these structures can be greatly enhanced by the use of techniques for the visualization and quantitative analysis of three-dimensional structure. Three projects from current research activities will be presented in order to illustrate both the present capabilities of computer aided techniques as well as their limitations and future possibilities.The first project concerns the three-dimensional reconstruction of the neuritic plaques found in the brains of patients with Alzheimer's disease. We have developed a software package “Synu” for investigation of 3D data sets which has been used in conjunction with laser confocal light microscopy to study the structure of the neuritic plaque. Tissue sections of autopsy samples from patients with Alzheimer's disease were double-labeled for tau, a cytoskeletal marker for abnormal neurites, and synaptophysin, a marker of presynaptic terminals.

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