Communications in Transportation Research最新文献

{"title":"VTOL site location considering obstacle clearance during approach and departure","authors":"Chenhao Guo ,&nbsp;Jianxiong Nie ,&nbsp;Xu Hang ,&nbsp;Yanjun Wang ,&nbsp;Yanyan Chen ,&nbsp;Daniel Delahaye","doi":"10.1016/j.commtr.2024.100118","DOIUrl":"https://doi.org/10.1016/j.commtr.2024.100118","url":null,"abstract":"<div><p>Urban air mobility (UAM) extends urban transportation to low-altitude airspace using electric vertical take-off and landing (eVTOL) vehicle to reduce traffic congestion. The vertical take-off and landing (VTOL) site connecting ground and air transport is the critical infrastructure of the UAM. Determining its locations is essential for the design and operation of the air route. This study focuses on the problem of the location of the VTOL site, using Shenzhen as the study area, and establishes an integer programming model with the objective of maximizing travel cost savings to identify the optimal locations of the VTOL sites. This study is different from existing ones in that it explicitly considers the three-dimensional spatial availability of VTOL sites. Geographic information system (GIS) tools are used to identify locations that satisfy two-dimensional (2D) planar availability, and an obstacle assessment model of the approach/departure and transitional surfaces of the VTOL site is built to further screen the locations. The selected potential sites are used as input to the integer programming model, ensuring that the locations identified to establish the VTOL site are optimal. The impact of the number of VTOL sites, the user's transfer time at the VTOL sites, and the eVTOL pricing on the model solution is also discussed. Although this study uses Shenzhen as a research object, the proposed methodology is generalized and applicable to any other city or region, providing recommendations and references for initial planning and related operations of the UAM in selected areas.</p></div>","PeriodicalId":100292,"journal":{"name":"Communications in Transportation Research","volume":"4 ","pages":"Article 100118"},"PeriodicalIF":0.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772424724000015/pdfft?md5=7e4f79c5c175d33766ad790a223ab9a3&pid=1-s2.0-S2772424724000015-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140103812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acceptance of Mobility-as-a-Service: Insights from empirical studies on influential factors","authors":"Houda El Mustapha,&nbsp;Baris Ozkan,&nbsp;Oktay Turetken","doi":"10.1016/j.commtr.2024.100119","DOIUrl":"https://doi.org/10.1016/j.commtr.2024.100119","url":null,"abstract":"<div><p>Mobility-as-a-Service (MaaS) has emerged as a promising concept in the mobility landscape. Researchers are increasingly interested in understanding this digital service's potential acceptance and uptake. Despite this interest, the extant literature lacks a comprehensive overview of various factors that play a role in its acceptance by target users. In this study, we aim to establish a current state of the art of MaaS user acceptance to inform practice in the effective design of related services, and to support the scientific community by offering future directions for their research. To achieve this, we performed a Systematic Literature Review (SLR) of relevant empirical studies and analyzed the factors considered significant in MaaS acceptance by target users. Our in-depth analyses of these works resulted in several factors, which we grouped into three categories: traveler and trip characteristics, service and technology characteristics, and urban environment characteristics. Certain factors, such as age, trip frequency, MaaS bundle price, and transportation facility, were found to be consistent in their influence on MaaS acceptance. However, empirical works conflict regarding the influence of a number of factors, such as income and public transport card ownership. This study serves as a comprehensive source of the factors investigated in the literature to the moment and a basis for future research to improve our understanding of factors that require further investigation.</p></div>","PeriodicalId":100292,"journal":{"name":"Communications in Transportation Research","volume":"4 ","pages":"Article 100119"},"PeriodicalIF":0.0,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772424724000027/pdfft?md5=de02dfd6d9257df4e95e848043c67bd6&pid=1-s2.0-S2772424724000027-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140052824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"GPT-4 enhanced multimodal grounding for autonomous driving: Leveraging cross-modal attention with large language models","authors":"Haicheng Liao ,&nbsp;Huanming Shen ,&nbsp;Zhenning Li ,&nbsp;Chengyue Wang ,&nbsp;Guofa Li ,&nbsp;Yiming Bie ,&nbsp;Chengzhong Xu","doi":"10.1016/j.commtr.2023.100116","DOIUrl":"https://doi.org/10.1016/j.commtr.2023.100116","url":null,"abstract":"<div><p>In the field of autonomous vehicles (AVs), accurately discerning commander intent and executing linguistic commands within a visual context presents a significant challenge. This paper introduces a sophisticated encoder-decoder framework, developed to address visual grounding in AVs. Our Context-Aware Visual Grounding (CAVG) model is an advanced system that integrates five core encoders—Text, Emotion, Image, Context, and Cross-Modal—with a multimodal decoder. This integration enables the CAVG model to adeptly capture contextual semantics and to learn human emotional features, augmented by state-of-the-art Large Language Models (LLMs) including GPT-4. The architecture of CAVG is reinforced by the implementation of multi-head cross-modal attention mechanisms and a Region-Specific Dynamic (RSD) layer for attention modulation. This architectural design enables the model to efficiently process and interpret a range of cross-modal inputs, yielding a comprehensive understanding of the correlation between verbal commands and corresponding visual scenes. Empirical evaluations on the Talk2Car dataset, a real-world benchmark, demonstrate that CAVG establishes new standards in prediction accuracy and operational efficiency. Notably, the model exhibits exceptional performance even with limited training data, ranging from 50% to 75% of the full dataset. This feature highlights its effectiveness and potential for deployment in practical AV applications. Moreover, CAVG has shown remarkable robustness and adaptability in challenging scenarios, including long-text command interpretation, low-light conditions, ambiguous command contexts, inclement weather conditions, and densely populated urban environments.</p></div>","PeriodicalId":100292,"journal":{"name":"Communications in Transportation Research","volume":"4 ","pages":"Article 100116"},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772424723000276/pdfft?md5=a1dbc3e25c6818f6e3d6006770262c6e&pid=1-s2.0-S2772424723000276-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139914932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploring the benefits of personal rapid transit in metropolitan area","authors":"Yida Ding,&nbsp;Kai Wang,&nbsp;Lei Zhang,&nbsp;Xiaobo Qu","doi":"10.1016/j.commtr.2023.100117","DOIUrl":"https://doi.org/10.1016/j.commtr.2023.100117","url":null,"abstract":"","PeriodicalId":100292,"journal":{"name":"Communications in Transportation Research","volume":"4 ","pages":"Article 100117"},"PeriodicalIF":0.0,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772424723000288/pdfft?md5=8a3eaba49714688e9ec20a3404c7784a&pid=1-s2.0-S2772424723000288-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139473343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Designing user-centric transport strategies for urban road space redistribution","authors":"Manu Sasidharan ,&nbsp;Mehran Eskandari Torbaghan ,&nbsp;Yasmin Fathy ,&nbsp;Christopher D.F. Rogers ,&nbsp;Nicole Metje ,&nbsp;Jennifer Schooling","doi":"10.1016/j.commtr.2023.100109","DOIUrl":"https://doi.org/10.1016/j.commtr.2023.100109","url":null,"abstract":"<div><p>Cities worldwide are geared to promote economic growth, improve accessibility, address environmental issues, and enhance the quality of life. However, the processes that lead to the design of urban roads, particularly the space distribution, reflect the inequalities existing in the fabric of our society. Motorists often have shorter travel time and more space than passengers of other modes. Furthermore, the existing transport appraisal and planning tools that frame sustainable transport policies fall short of considering the dimension of social justice. Therefore, our urban transport systems are essential areas for advancing sustainability through a transport justice-based approach to planning that can pivot the distribution of infrastructure investments over different social groups and transport modes. This study proposes such an approach by which such suitable urban transport strategies can be identified, co-created with users and appraised while considering the commuters’ needs. Specifically, the interaction between the multidimensional characteristics of sustainability and the principles of transport justice are investigated. The proposed approach is applied to London and Birmingham. The results show that a transparent and holistic approach to integrating users within transport planning is an effective way to reflect diverse needs and local circumstances and thereby ensure a just transition to sustainable urban transport policies. The results from the case studies highlight a strong rationale for the centrality of justice in any urban transport planning and policy making efforts, particularly in the allocation of road space.</p></div>","PeriodicalId":100292,"journal":{"name":"Communications in Transportation Research","volume":"3 ","pages":"Article 100109"},"PeriodicalIF":0.0,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772424723000203/pdfft?md5=b58bac02ae47ff8721f08f0605348003&pid=1-s2.0-S2772424723000203-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138453571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Continuum modeling of freeway traffic flows: State-of-the-art, challenges and future directions in the era of connected and automated vehicles","authors":"Saeed Mohammadian ,&nbsp;Zuduo Zheng ,&nbsp;Md. Mazharul Haque ,&nbsp;Ashish Bhaskar","doi":"10.1016/j.commtr.2023.100107","DOIUrl":"https://doi.org/10.1016/j.commtr.2023.100107","url":null,"abstract":"<div><p>Connected and automated vehicles (CAVs) are expected to reshape traffic flow dynamics and present new challenges and opportunities for traffic flow modeling. While numerous studies have proposed optimal modeling and control strategies for CAVs with various objectives (e.g., traffic efficiency and safety), there are uncertainties about the flow dynamics of CAVs in real-world traffic. The uncertainties are especially amplified for mixed traffic flows, consisting of CAVs and human-driven vehicles, where the implications can be significant from the continuum-modeling perspective, which aims to capture macroscopic traffic flow dynamics based on hyperbolic systems of partial differential equations. This paper aims to highlight and discuss some essential problems in continuum modeling of real-world freeway traffic flows in the era of CAVs. We first provide a select review of some existing continuum models for conventional human-driven traffic as well as the recent attempts for incorporating CAVs into the continuum-modeling framework. Wherever applicable, we provide new insights about the properties of existing models and revisit their implications for traffic flows of CAVs using recent empirical observations with CAVs and the previous discussions and debates in the literature. The paper then discusses some major problems inherent to continuum modeling of real-world (mixed) CAV traffic flows modeling by distinguishing between two major research directions: (a) modeling for explaining purposes, where making reproducible inferences about the physical aspects of macroscopic properties is of the primary interest, and (b) modeling for practical purposes, in which the focus is on the reliable predictions for operation and control. The paper proposes some potential solutions in each research direction and recommends some future research topics.</p></div>","PeriodicalId":100292,"journal":{"name":"Communications in Transportation Research","volume":"3 ","pages":"Article 100107"},"PeriodicalIF":0.0,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772424723000185/pdfft?md5=5f96701fd7fda9aea7ae7711d1e6930c&pid=1-s2.0-S2772424723000185-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138448100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Same-day delivery time-guarantee problem in online retail","authors":"Hossein Fotouhi,&nbsp;Elise Miller-Hooks","doi":"10.1016/j.commtr.2023.100105","DOIUrl":"https://doi.org/10.1016/j.commtr.2023.100105","url":null,"abstract":"<div><p>This study introduces the same-day delivery time-guarantee (SDDTG) problem for supporting online retail. In the SDDTG, orders are placed online and are processed and delivered from a depot to customer locations in the same day. The problem seeks optimal delivery time guarantees to offer customers as they consider making purchases to increase purchase decision likelihood while accounting for delivery-related, supply-side costs that can affect profits. Time guarantees are decision variables rather than parameters (as is typical) and are designed around anticipated customer satisfaction levels and purchase likelihoods. Delivery deadlines are not merely given to customers once they make their purchases, but rather the attractiveness of the offered delivery guarantees affects whether they make their purchases, i.e., whether demand is realized. The problem is conceptualized as a multi-stage, stochastic, mixed-integer program in which uncertainties associated with customer reaction to delivery time guarantee offers and their arrival over time are captured. Given a shrinking horizon over a fixed planning horizon, the multi-stage program is approximated by a series of two-stage programs. A parallelized progressive hedging solution methodology is proposed and insights from its application on a case study. The problem recognizes tradeoffs between meeting promised delivery times and capturing the market.</p></div>","PeriodicalId":100292,"journal":{"name":"Communications in Transportation Research","volume":"3 ","pages":"Article 100105"},"PeriodicalIF":0.0,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772424723000161/pdfft?md5=ff047fbdddd2f108991a88db31fbbd5a&pid=1-s2.0-S2772424723000161-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138453569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adapting node–place model to predict and monitor COVID-19 footprints and transmission risks","authors":"Jiali Zhou,&nbsp;Mingzhi Zhou,&nbsp;Jiangping Zhou,&nbsp;Zhan Zhao","doi":"10.1016/j.commtr.2023.100110","DOIUrl":"https://doi.org/10.1016/j.commtr.2023.100110","url":null,"abstract":"<div><p>The node–place model has been widely used to classify and evaluate transit stations, which sheds light on individuals’ travel behaviors and supports urban planning through effectively integrating land use and transportation development. This study adapts this model to investigate whether and how node, place, and mobility would be associated with the transmission risks and presences of the local COVID-19 cases in a city. Moreover, the unique metric drawn from detailed visit history of the infected, i.e., the COVID-19 footprints, is proposed and exploited. This study then empirically uses the adapted model to examine the station-level factors affecting the local COVID-19 footprints. The model accounts for traditional measures of the node and place as well as actual human mobility patterns associated with the node and place. It finds that stations with high node, place, and human mobility indices normally have more COVID-19 footprints in proximity. A multivariate regression is fitted to see whether and to what degree different indices and indicators can predict the COVID-19 footprints. The results indicate that many of the place, node, and human mobility indicators significantly impact the concentration of COVID-19 footprints. These are useful for policy-makers to predict and monitor hotspots for COVID-19 and other pandemics’ transmission.</p></div>","PeriodicalId":100292,"journal":{"name":"Communications in Transportation Research","volume":"3 ","pages":"Article 100110"},"PeriodicalIF":0.0,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772424723000215/pdfft?md5=63b3570764926b5829d368e067f2aff0&pid=1-s2.0-S2772424723000215-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138448101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An ADMM-based parallel algorithm for solving traffic assignment problem with elastic demand","authors":"Kai Zhang ,&nbsp;Honggang Zhang ,&nbsp;Yu Dong ,&nbsp;Yunchi Wu ,&nbsp;Xinyuan Chen","doi":"10.1016/j.commtr.2023.100108","DOIUrl":"https://doi.org/10.1016/j.commtr.2023.100108","url":null,"abstract":"<div><p>Efficiently solving the user equilibrium traffic assignment problem with elastic demand (UE-TAPED) for transportation networks is a critical problem for transportation studies. Most existing UE-TAPED algorithms are designed using a sequential computing scheme, which cannot take advantage of advanced parallel computing power. Therefore, this study focuses on model decomposition and parallelization, proposing an origin-based formulation for UE-TAPED and proving an equivalent reformulation of the original problem. Furthermore, the alternative direction method of multipliers (ADMM) is employed to decompose the original problem into independent link-based subproblems, which can solve large-scale problems with small storage space. In addition, to enhance the efficiency of our algorithm, the parallel computing technology with optimal parallel computing schedule is implemented to solve the link-based subproblems. Numerical experiments are performed to validate the computation efficiency of the proposed parallel algorithm.</p></div>","PeriodicalId":100292,"journal":{"name":"Communications in Transportation Research","volume":"3 ","pages":"Article 100108"},"PeriodicalIF":0.0,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772424723000197/pdfft?md5=9da8b537fd13184fc4bf030e1efbc56a&pid=1-s2.0-S2772424723000197-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138453570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Empowering highway network: Optimal deployment and strategy for dynamic wireless charging lanes","authors":"Mingyang Pei ,&nbsp;Hongyu Zhu ,&nbsp;Jiazheng Ling ,&nbsp;Yi Hu ,&nbsp;Handong Yao ,&nbsp;Lingshu Zhong","doi":"10.1016/j.commtr.2023.100106","DOIUrl":"https://doi.org/10.1016/j.commtr.2023.100106","url":null,"abstract":"<div><p>Amid escalating energy crises and environmental pressures, electric vehicles (EVs) have emerged as an effective measure to reduce reliance on fossil fuels, combat climate change, uphold sustainable energy and environmental development, and strive towards carbon peaking and neutrality goals. This study introduces a nonlinear integer programming model for the deployment of dynamic wireless charging lanes (DWCLs) and EV charging strategy joint optimization in highway networks. Taking into account established charging resources in highway service areas (HSAs), the nonlinear charging characteristics of EV batteries, and the traffic capacity constraints of DWCLs. The model identifies the deployment of charging facilities and the EV charging strategy as the decision-making variables and aims to minimize both the DWCL construction and user charging costs. By ensuring that EVs maintain an acceptable state of charge (<em>SoC</em>), the model combines highway EV charging demand and highway EV charging strategy to optimize the DWCL deployment, thus reducing the construction cost of wireless charging facilities and user charging expenses. The efficacy and universality of the model are demonstrated using the classical Nguyen–Dupius network as a numerical example and a real-world highway network in Guangdong Province, China. Finally, a sensitivity analysis is conducted to corroborate the stability of the model. The results show that the operating speed of EVs on DWCLs has the largest impact on total cost, while battery capacity has the smallest. This comprehensive study offers vital insights into the strategic deployment of DWCLs, promoting the sustainable and efficient use of EVs in highway networks.</p></div>","PeriodicalId":100292,"journal":{"name":"Communications in Transportation Research","volume":"3 ","pages":"Article 100106"},"PeriodicalIF":0.0,"publicationDate":"2023-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772424723000173/pdfft?md5=b07786dad27bcb45d6ce12c439e50445&pid=1-s2.0-S2772424723000173-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138136210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}