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.

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.

Spatial and Temporal Differences in Weekday Travel Durations Between Private-for-Hire Transportation Services and Transit in the City Center

2021 ◽  
pp. 036119812110197
Author(s):  
Baxter Shandobil ◽  
Ty Lazarchik ◽  
Kelly Clifton
Keyword(s):  
Transportation Network ◽  
Central City ◽  
Temporal Analysis ◽  
Time Of Day ◽  
City Center ◽  
Transportation Services ◽  
Regulatory Frameworks ◽  
Transit Services ◽  
Level Information ◽  
The City

There is increasing evidence that ridehailing and other private-for-hire (PfH) services such as taxis and limousines are diverting trips from transit services. One question that arises is where and when PfH services are filling gaps in transit services and where they are competing with transit services that are publicly subsidized. Using weekday trip-level information for trips originating in or destined for the city center of Portland, OR from PfH transportation services (taxis, transportation network companies, limousines) and transit trip data collected from OpenTripPlanner, this study investigated the temporal and spatial differences in travel durations between actual PfH trips and comparable transit trips (the same origin–destination and time of day). This paper contributes to this question and to a growing body of research about the use of ridehailing and other on-demand services. Specifically, it provides a spatial and temporal analysis of the demand for PfH transportation using an actual census of trips for a given 2 week period. The comparison of trip durations of actual PfH trips to hypothetical transit trips for the same origin–destination pairs into or out of the central city gives insights for policy making around pricing and other regulatory frameworks that could be implemented in time and space.

scholarly journals Characterization of Electrograms from Multipolar Diagnostic Catheters during Atrial Fibrillation

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Prasanth Ganesan ◽  
Elizabeth M. Cherry ◽  
Arkady M. Pertsov ◽  
Behnaz Ghoraani
Keyword(s):  
Atrial Fibrillation ◽  
Catheter Ablation ◽  
Simulation Study ◽  
Cycle Length ◽  
Human Subject ◽  
Conduction Delay ◽  
Ablation Procedure ◽  
Endocardial Surface ◽  
Diagnostic Catheter

Atrial fibrillation (AF) is the most common arrhythmia in USA with more than 2.3 million people affected annually. Catheter ablation procedure is a method for treatment of AF, which involves 3D electroanatomic mapping of the patient's left atrium (LA) by maneuvering a conventional multipolar diagnostic catheter (MPDC) along the LA endocardial surface after which pulmonary vein (PV) isolation is performed, thus eliminating the AF triggers originating from the PVs. However, it remains unclear how to effectively utilize the information provided by the MPDC to locate the AF-sustaining sites, known as sustained rotor-like activities (RotAs). In this study, we use computer modeling to investigate the variations in the characteristics of the MPDC electrograms, namely, total conduction delay (TCD) and average cycle length (CL), as the MPDC moves towards a RotA source. Subsequently, a study with a human subject was performed in order to verify the predictions of the simulation study. The conclusions from this study may be used to iteratively direct an MPDC towards RotA sources thus allowing the RotAs to be localized for customized and improved AF ablation.

Critical street links for demand responsive feeder transit services

2013 ◽  
Vol 66 (3) ◽  
pp. 584-592 ◽  
Author(s):  
Shailesh Chandra ◽  
Luca Quadrifoglio
Keyword(s):  
Feeder Transit ◽  
Transit Services
Sign in / Sign up

Export Citation Format

Share Document