Transportation Research Part D-transport and Environment最新文献_第9页

“Bridge over troubled water”: Perceived accessibility prevents social exclusion in Chinese cities “浑水之桥”：在中国城市中，人们对无障碍的感知阻止了社会排斥

IF 7.3 1区工程技术

Transportation Research Part D-transport and Environment Pub Date : 2025-07-26 DOI: 10.1016/j.trd.2025.104930

Jiahang Liu, Qiyang Liu

{"title":"“Bridge over troubled water”: Perceived accessibility prevents social exclusion in Chinese cities","authors":"Jiahang Liu, Qiyang Liu","doi":"10.1016/j.trd.2025.104930","DOIUrl":"10.1016/j.trd.2025.104930","url":null,"abstract":"<div><div>This study examines the relationship between perceived accessibility and social exclusion in rapidly urbanising Chinese cities, revealing how subjective mobility evaluations impact inclusion across diverse populations. Applying double/debiased machine learning to data from 5591 respondents across ten major cities, we analyse three dimensions of perceived accessibility—daily necessities, public services, and social activities—and their differential effects on social exclusion. Results show that whilst all dimensions significantly mitigate exclusion, social activities accessibility exerts the strongest influence, underscoring the primacy of relational connections in fostering inclusion. Women demonstrate heightened sensitivity to daily necessities accessibility, elderly individuals respond almost exclusively to social activities accessibility, and economically disadvantaged populations show strong associations between public services accessibility and reduced exclusion. These patterns demonstrate how accessibility needs are fundamentally structured by social position. By emphasising equality-transcending perspectives on transport justice, we offer policymakers a nuanced framework for prioritising targeted interventions that address social exclusion.</div></div>","PeriodicalId":23277,"journal":{"name":"Transportation Research Part D-transport and Environment","volume":"147 ","pages":"Article 104930"},"PeriodicalIF":7.3,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144704861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Resilience assessment of urban bus-metro system to floods under future climate change 未来气候变化下城市公交地铁系统对洪水的恢复力评价

IF 7.7 1区工程技术

Transportation Research Part D-transport and Environment Pub Date : 2025-07-25 DOI: 10.1016/j.trd.2025.104925

Chengchen Guo , Jingyuan Tang , Jingke Hong , Qiuchen Lu , Hengliang Wu , Ran Wei

引用次数: 0

Spatial spillover effects of shared micro-mobility on public transit in medium-sized cities 共享微交通对中等城市公共交通的空间溢出效应

IF 7.3 1区工程技术

Transportation Research Part D-transport and Environment Pub Date : 2025-07-25 DOI: 10.1016/j.trd.2025.104923

Xize Liu , Jingxu Chen , Xuewu Chen , Xinlian Yu

{"title":"Spatial spillover effects of shared micro-mobility on public transit in medium-sized cities","authors":"Xize Liu , Jingxu Chen , Xuewu Chen , Xinlian Yu","doi":"10.1016/j.trd.2025.104923","DOIUrl":"10.1016/j.trd.2025.104923","url":null,"abstract":"<div><div>The rapid expansion of shared micromobility (SMM) is transforming urban transportation in medium-sized cities. This study examines the impact of electric free-floating bike-sharing (Floating E-Bike), free-floating bike-sharing (Floating Bike), and station-based bike-sharing (Station Bike) on public transit ridership in Yancheng, China, using a Dynamic Spatial Durbin Model. Results reveal significant spatial spillover effects, emphasizing the necessity of considering interdependence in transit analyses. A 1% increase in Floating E-Bike usage is associated with a 0.53% decline in transit ridership, while the other two modes show positive associations. Land use analysis indicates that commercial areas exhibit negative direct effects but positive spillover effects, whereas employment areas demonstrate the reverse pattern. By contrast, educational and residential areas consistently generate positive effects. Socio-economic factors, including population density and housing prices, also shape transit ridership. Heterogeneity analysis highlights stronger Floating E-Bike competition in Yancheng’s historic core due to limited parking, restricting SMM-transit integration.</div></div>","PeriodicalId":23277,"journal":{"name":"Transportation Research Part D-transport and Environment","volume":"147 ","pages":"Article 104923"},"PeriodicalIF":7.3,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144704539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Allocating carbon emissions from crude oil tanker shipping: Full voyage lifecycle perspective 原油油轮运输的碳排放分配：全航次生命周期视角

IF 7.3 1区工程技术

Transportation Research Part D-transport and Environment Pub Date : 2025-07-25 DOI: 10.1016/j.trd.2025.104919

Xueting Zhao , Peng Jia , Haijiang Li , Ruibin Si

{"title":"Allocating carbon emissions from crude oil tanker shipping: Full voyage lifecycle perspective","authors":"Xueting Zhao , Peng Jia , Haijiang Li , Ruibin Si","doi":"10.1016/j.trd.2025.104919","DOIUrl":"10.1016/j.trd.2025.104919","url":null,"abstract":"<div><div>This study introduces a full voyage lifecycle framework that links maritime CO<sub>2</sub> emissions to international trade flows through First-In-First-Out (FIFO) cargo tracking. By analysing AIS trajectories of 2,491 crude oil tankers in 2020, we quantified total shipping emissions at approximately 108 million tonnes of CO<sub>2</sub>, of which ballast voyages accounted for nearly 40 %. Distinct from conventional allocation methods (flag-state registration, fuel sales, or simplistic port-to-port voyages), our approach significantly enhances allocation equity: the trade-normalized Gini coefficient decreases from 0.232 under traditional voyage-based methods to 0.151 with back-allocation. Sensitivity analyses confirm robust policy flexibility, demonstrating minimal changes in national emission responsibility rankings when varying the exporter–importer allocation factor (α = 0.25–0.75). This framework provides a practical foundation for integrating shipping emissions into emerging carbon pricing mechanisms, harmonizing maritime carbon accountability with global trade, and supporting equitable international climate governance.</div></div>","PeriodicalId":23277,"journal":{"name":"Transportation Research Part D-transport and Environment","volume":"147 ","pages":"Article 104919"},"PeriodicalIF":7.3,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144704540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Large-scale electric bus network transition planning via deep reinforcement learning 基于深度强化学习的大规模电动公交网络过渡规划

IF 7.3 1区工程技术

Transportation Research Part D-transport and Environment Pub Date : 2025-07-21 DOI: 10.1016/j.trd.2025.104899

Luyun Zhao , Shiyu Shen , Zhan Zhao

{"title":"Large-scale electric bus network transition planning via deep reinforcement learning","authors":"Luyun Zhao , Shiyu Shen , Zhan Zhao","doi":"10.1016/j.trd.2025.104899","DOIUrl":"10.1016/j.trd.2025.104899","url":null,"abstract":"<div><div>Urban bus electrification is gaining global interest, playing a crucial role in reducing emissions. This study defines and addresses the electric bus network transition problem (EBNTP), jointly optimizing battery electric bus (BEB) fleet transitions and charging facility planning over a multi-period horizon. Existing research often neglects this interdependent long-term planning and lacks scalable solutions for large systems. This study proposes a deep reinforcement learning (DRL) approach, formulating EBNTP as a Markov Decision Process modeling sequential planning decisions, and introduces the DRL-HetGNN method, integrating heterogeneous graph neural networks (HetGNN) to capture network effects and enhance efficiency in large-scale applications. Using Hong Kong’s franchised bus system as a case study, DRL-HetGNN demonstrates superior performance and generalizability compared to benchmark methods. Scenario analyses explore budget allocations, independent operators, BEB subsidies, and price fluctuations, while examining policy-incentive mechanisms to accelerate electrification. The findings will support policymakers in planning sustainable public transportation systems.</div></div>","PeriodicalId":23277,"journal":{"name":"Transportation Research Part D-transport and Environment","volume":"146 ","pages":"Article 104899"},"PeriodicalIF":7.3,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144679833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The impacts of port truck traffic’s temporal patterns on emissions 港口货车交通时空格局对排放的影响

IF 7.3 1区工程技术

Transportation Research Part D-transport and Environment Pub Date : 2025-07-21 DOI: 10.1016/j.trd.2025.104918

Julia C. Amaral , Carlos Rivera-González , José Holguín-Veras

引用次数: 0

Is Title VI enough? A review of bus network redesign equity analyses 第六章够了吗？公交网络重新设计公平性分析综述

IF 7.3 1区工程技术

Transportation Research Part D-transport and Environment Pub Date : 2025-07-19 DOI: 10.1016/j.trd.2025.104905

Minyu Situ, Alex Karner

引用次数: 0

Reinforcement learning-driven autonomous navigation strategy for rotor-assisted vehicles via integral event-triggered mechanism 基于整体事件触发机制的旋翼辅助车辆强化学习自主导航策略

IF 7.3 1区工程技术

Transportation Research Part D-transport and Environment Pub Date : 2025-07-19 DOI: 10.1016/j.trd.2025.104841

Guoqing Zhang , Zhihao Li , Jiqiang Li , Yaqing Shu , Xianku Zhang

{"title":"Reinforcement learning-driven autonomous navigation strategy for rotor-assisted vehicles via integral event-triggered mechanism","authors":"Guoqing Zhang , Zhihao Li , Jiqiang Li , Yaqing Shu , Xianku Zhang","doi":"10.1016/j.trd.2025.104841","DOIUrl":"10.1016/j.trd.2025.104841","url":null,"abstract":"<div><div>To exploit wind resources for maritime decarbonization, this study proposes an autonomous navigation strategy driven by reinforcement learning (RL) for rotor-assisted vehicles (RAVs) equipped with rotor-sails—a pivotal wind-assisted propulsion technology. For achieving the optimal solution in each backstepping step, a concise and robust path following optimization algorithm using RL is designed in the form of actor-critic neural networks (AC-NNs), where the actor NNs generate control commands through real-time state feedback and the critic NNs perform state value assessment based on environmental information. Furthermore, an integral dynamic variable threshold event-triggered mechanism dependent on output state errors is proposed to avoid excessive actuator wear caused by frequent updates and transmission of control commands. Finally, theoretical validation and numerical experiments are illustrated to confirm the viability of the proposed RL-driven navigation strategy and its significant contribution to energy conservation in maritime transport.</div></div>","PeriodicalId":23277,"journal":{"name":"Transportation Research Part D-transport and Environment","volume":"146 ","pages":"Article 104841"},"PeriodicalIF":7.3,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative assessment of black carbon levels in public transit systems across three cities 三个城市公共交通系统中黑碳水平的比较评估

IF 7.3 1区工程技术

Transportation Research Part D-transport and Environment Pub Date : 2025-07-18 DOI: 10.1016/j.trd.2025.104904

Alejandro Perez Villasenor , Xudong Wang , Jill Baumgartner , Luis Miranda-Moreno

{"title":"Comparative assessment of black carbon levels in public transit systems across three cities","authors":"Alejandro Perez Villasenor , Xudong Wang , Jill Baumgartner , Luis Miranda-Moreno","doi":"10.1016/j.trd.2025.104904","DOIUrl":"10.1016/j.trd.2025.104904","url":null,"abstract":"<div><div>This research investigates users’ exposure to black carbon (BC) in subways, buses, and BRTs. The study was conducted in Mexico City and Puebla (Mexico) and Montreal (Canada) to identify city-specific variations across modes and factors associated with levels of BC. Over 1500 min were collected, and regression model analyses were used to identify the impacts of mode and other factors. Among all measured transit modes, subway systems exhibited the highest BC concentrations (median: 10.83 <span><math><mrow><mi>μ</mi><mi>g</mi><mo>/</mo><msup><mrow><mi>m</mi></mrow><mrow><mn>3</mn></mrow></msup></mrow></math></span>; MAD: ±6.97 <span><math><mrow><mi>μ</mi><mi>g</mi><mo>/</mo><msup><mrow><mi>m</mi></mrow><mrow><mn>3</mn></mrow></msup></mrow></math></span>). In contrast, BRT systems showed the lowest exposure levels (3.7228 ± 2.27 <span><math><mrow><mi>μ</mi><mi>g</mi><mo>/</mo><msup><mrow><mi>m</mi></mrow><mrow><mn>3</mn></mrow></msup></mrow></math></span>), with buses demonstrating comparable concentrations (4.00 ± 2.22 <span><math><mrow><mi>μ</mi><mi>g</mi><mo>/</mo><msup><mrow><mi>m</mi></mrow><mrow><mn>3</mn></mrow></msup></mrow></math></span>). Notably, high concentrations in subways are primarily observed in segments where the subway operates in underground tunnels. Both surface transit modes measured slightly above ambient outdoor levels (2.82 ±1.66 <span><math><mrow><mi>μ</mi><mi>g</mi><mo>/</mo><msup><mrow><mi>m</mi></mrow><mrow><mn>3</mn></mrow></msup></mrow></math></span>), suggesting minimal additional exposure during above-ground commute.</div></div>","PeriodicalId":23277,"journal":{"name":"Transportation Research Part D-transport and Environment","volume":"146 ","pages":"Article 104904"},"PeriodicalIF":7.3,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An analytical eco-driving trajectory planning method with field test validation at intersections 一种分析型生态驾驶轨迹规划方法及交叉口现场试验验证

IF 7.3 1区工程技术

Transportation Research Part D-transport and Environment Pub Date : 2025-07-17 DOI: 10.1016/j.trd.2025.104870

Zhaohui Liang, Chengyuan Ma, Hang Zhou, Keke Long, Xiaopeng Li

引用次数: 0