Communications in Transportation Research最新文献

{"title":"Cost of travel delays caused by traffic crashes","authors":"Ting Lian ,&nbsp;Becky P.Y. Loo","doi":"10.1016/j.commtr.2024.100124","DOIUrl":"https://doi.org/10.1016/j.commtr.2024.100124","url":null,"abstract":"<div><p>This study proposes a method for measuring travel delays caused by traffic crashes based on taxi GPS data and other open-source spatial data. Travel delays caused by traffic crashes are quantified according to the difference between the post-crash and typical travel speeds on affected road segments. Based on multiple sources of data in Hong Kong, we also develop a generalized linear model with explanatory variables including crash characteristics, temporal attributes, road network features, traffic indicators, and built environment features, to unveil the relationship between travel delays and these factors. The findings show that crash characteristics alone inadequately explain variations in delays. The model performance improves after factors about the built environment and the dynamic road conditions are incorporated. This underscores the importance of urban factors in traffic delay analysis. Furthermore, we estimate the total travel delays caused by traffic crashes in the city. It is estimated that Hong Kong has suffered from a total delay of 713,877 vehicle-hours in 2021. The associated economic loss amounts to US$11.02 million. This study contributes to methodological advances in estimating crash-induced travel delays. The explanatory model considers factors which help policy makers and planners to identify risky factors and hot spots for devising more targeted and effective strategies of shortening crash-induced traffic congestion in the future. In addition, the findings highlight the significance and magnitude of another negative externality of traffic crashes – traffic delays – in a complex urban road network.</p></div>","PeriodicalId":100292,"journal":{"name":"Communications in Transportation Research","volume":"4 ","pages":"Article 100124"},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772424724000076/pdfft?md5=7dd2e7443178cff7cac1d1f954f1b6e8&pid=1-s2.0-S2772424724000076-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140554426","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":"A binary choice model for adoption of an emerging travel mode with unique service features","authors":"Yu Gu ,&nbsp;Anthony Chen ,&nbsp;Sunghoon Jang ,&nbsp;Songyot Kitthamkesorn","doi":"10.1016/j.commtr.2024.100121","DOIUrl":"https://doi.org/10.1016/j.commtr.2024.100121","url":null,"abstract":"<div><p>In the era of emerging technologies, the transportation system is witnessing the introduction of innovative mobility services, such as autonomous vehicles, which possess unique service features that cannot be seen from conventional travel modes. To facilitate the understanding of the behavioral impacts and the adoption of innovative mobilities, a novel binary weibit model with an oddball alternative (BW-O) is developed for the binary choice between conventional and emerging mobilities. The BW-O model explicitly considers the unprecedented (or unique) service features of emerging travel modes while retaining the closed-form choice probability. This study empirically illustrates the application of the BW-O model in the mode choice context. The desirable properties of the BW-O model compared to the existing binary choice models are discussed both theoretically and empirically. In the binary mode choice problem with an emerging travel mode, the unique service features of the emerging mode can lead to the “oddball” effect and “superstar” effect, which play a critical role in the travel behavior and mode adoption. The BW-O model inherently captures both effects by considering a higher perception variance for the emerging mode and asymmetric choice probabilities between different modes. Thus, as revealed by the empirical results, the BW-O model outperforms the basic binary weibit model in terms of both model fit and predictive power. The developed BW-O model is not only applicable to the mode choice problem in transportation systems, but also opens a door for more general class-imbalanced binary choice contexts where an alternative has additional attractiveness and asymmetric choice probability.</p></div>","PeriodicalId":100292,"journal":{"name":"Communications in Transportation Research","volume":"4 ","pages":"Article 100121"},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772424724000040/pdfft?md5=65156b1a81922a86bdb5ae27710bdf8f&pid=1-s2.0-S2772424724000040-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140341105","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":"Creation of the MaaS readiness index with a modified AHP-ISM method","authors":"Attila Aba,&nbsp;Domokos Esztergár-Kiss","doi":"10.1016/j.commtr.2024.100122","DOIUrl":"https://doi.org/10.1016/j.commtr.2024.100122","url":null,"abstract":"<div><p>Smart mobility solutions are trending in the mobility domain realized through pilot activities and commercial solutions, but there is a lack of a broad framework defining the readiness to introduce such mobility solutions in a specific area. In this research, smart mobility solutions are examined in the perspective of the Mobility-as-a-Service (MaaS) scheme that is an adequate representation of the maturity of a region regarding smart mobility solutions including technology, business, and coopetition aspects. These three aspects define the feature selection, whereas surveys are used to collect input data from local experts (LEs). For weighting the features, the analytic hierarchy process (AHP) is used with a modified interpretive structural modeling (ISM). With this modification, an expert-friendly process is developed without affecting the results. The elaborated MaaS readiness index (MRI) is applied to six regions with different types of mobility related pilot activities to demonstrate the MRI as a comparison tool between regions and between ex-ante and ex-post pilot activities. The developed interpretive structural modeling with Graph (ISM-G) methodology requites remarkably less work from the evaluators compared to the ISM, while no important difference appeared in the results. The MRI can support smart mobility related pilot evaluations, whereas the ISM-G can be used widely in decision-making.</p></div>","PeriodicalId":100292,"journal":{"name":"Communications in Transportation Research","volume":"4 ","pages":"Article 100122"},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772424724000052/pdfft?md5=47cf8eb5c19c492c8387d92054f3fc47&pid=1-s2.0-S2772424724000052-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140341881","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":"GraphCast for solving the air transportation nexus among safety, efficiency, and resilience","authors":"Sebastian Wandelt ,&nbsp;Xiaoqian Sun ,&nbsp;Jun Zhang","doi":"10.1016/j.commtr.2024.100120","DOIUrl":"https://doi.org/10.1016/j.commtr.2024.100120","url":null,"abstract":"","PeriodicalId":100292,"journal":{"name":"Communications in Transportation Research","volume":"4 ","pages":"Article 100120"},"PeriodicalIF":0.0,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772424724000039/pdfft?md5=27dbd94d2aa433fe12ee7cdd73a9bfee&pid=1-s2.0-S2772424724000039-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140187299","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":"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}