Estimation of Transit Passenger Origin-Destination Matrices from Passenger Counts in Congested Transit Networks

Author(s):  
W. H. K. Lam ◽  
Z. X. Wu
Keyword(s):  
Transfers ◽  
2014 ◽  
Vol 4 (2) ◽  
pp. 86-103 ◽  
Author(s):  
John D. Schwetman

After Harry Beck designed his map of the London Underground, it became an icon of the city and a model for maps in other large transit networks around the world. The map allowed its readers to see themselves as components of the large, organized structure of the metropolis but also confronted them with the possibility of losing themselves to that structure. An analysis of the post-Beck subway map tradition shows it to be a battleground between the zeal for order and the latent chaos at the heart of the urban communities that the map represents and also situates this conflict in a larger context of the emergence of a global societal structure bound together by the control of capital and of the information that enables such control.


2021 ◽  
Vol 124 ◽  
pp. 102925
Author(s):  
Jiemin Xie ◽  
Shuguang Zhan ◽  
S.C. Wong ◽  
S.M. Lo
Keyword(s):  

Omega ◽  
2015 ◽  
Vol 50 ◽  
pp. 29-42 ◽  
Author(s):  
Liujiang Kang ◽  
Jianjun Wu ◽  
Huijun Sun ◽  
Xiaoning Zhu ◽  
Bo Wang

Author(s):  
Lei Xu ◽  
Tsan Sheng (Adam) Ng ◽  
Alberto Costa

In this paper, we develop a distributionally robust optimization model for the design of rail transit tactical planning strategies and disruption tolerance enhancement under downtime uncertainty. First, a novel performance function evaluating the rail transit disruption tolerance is proposed. Specifically, the performance function maximizes the worst-case expected downtime that can be tolerated by rail transit networks over a family of probability distributions of random disruption events given a threshold commuter outflow. This tolerance function is then applied to an optimization problem for the planning design of platform downtime protection and bus-bridging services given budget constraints. In particular, our implementation of platform downtime protection strategy relaxes standard assumptions of robust protection made in network fortification and interdiction literature. The resulting optimization problem can be regarded as a special variation of a two-stage distributionally robust optimization model. In order to achieve computational tractability, optimality conditions of the model are identified. This allows us to obtain a linear mixed-integer reformulation that can be solved efficiently by solvers like CPLEX. Finally, we show some insightful results based on the core part of Singapore Mass Rapid Transit Network.


Author(s):  
Ravigopal Vennelakanti ◽  
Malarvizhi Sankaranarayanasamy ◽  
Ramyar Saeedi ◽  
Rahul Vishwakarma ◽  
Prasun Singh ◽  
...  

Abstract Mobility is no longer just a necessity for travelers, but choices among several possible routes and transportation modes. Urban passenger rail transport plays an essential role because it is affordable, convenient, safe, and fast. On the other hand, rail lines are limited to high passenger density corridors. Inevitably, rail has to be placed together with different transport modes, forming a multimodal network. However, to enable this integration with other modes of transport, numerous practical problems remain, such as making a smooth transition from the existing siloed, mode specific operational structure towards an interconnected system of transportation modes and business models for a seamless connected journey. The current isolated operational structure lacks a single truth and accurate visibility, which further discourages participation from augmenting transportation modes and leads to the extended reaction time for new technology integration. This research article introduces a Multimodal Mobility (MMM) solution framework that provides a functional interface to integrate and synchronize the railroad operations with other public transit networks (including train-bus-rapid transits) and micro-mobility services. The known approach to addressing the users’ seamless mobility experience entails a centralized, prearranged, a priori knowledge and mechanism for operating intermodal transport systems. In contrast, the method defined in this paper focuses on a market-driven demand-responsive system that allows for dis-intermediation in a network of peer-level transportation modes operations. The framework facilitates blockchain-based decentralized and multi-organizational engagement. The focus here is the role of railroad in the multimodal ecosystem and its performance advancements in this integrated solutions framework. Leveraging a combination of graph analytics and machine learning algorithms, we provide methods to address challenges in encoding spatial and temporal dependencies of multimodal transit networks and handle complex optimization problems such as mixed time window and volume variation for resource allocation and transit operational analytics. This enables operation of different transit modes with varied resolution and flexibility for operational parameters like time, capacity, ridership, revenue management, etc. The analytics enable solutions for recommendations on synchronizing and integrating operations of transportation systems. Further, the network’s decentralization and modular handling enable market-driven co-optimization of operational resources across various transportation modes to ensure seamless transit experience for users.


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