{"title":"Comparative evaluation of alternative Bayesian semi-parametric spatial crash frequency models","authors":"Gurdiljot Singh Gill , Wen Cheng , Mankirat Singh , Yihua Li","doi":"10.1016/j.jtte.2022.01.005","DOIUrl":"10.1016/j.jtte.2022.01.005","url":null,"abstract":"<div><div>Albeit with the notable benefits associated with Dirichlet crash frequency models and spatial ones, there is little research dedicated to exploring their combined advantages. Such ensemble approach could be a viable alternative to existing models as it accounts for the unobserved heterogeneity by relaxing the constraints of specific distribution placed on the intercept while addressing the spatial correlations among roadway entities. To fill this gap, the authors aimed to develop Dirichlet semi-parametric models over the over-dispersed generalized linear model framework while also incorporating spatially structured random effects using a distance-based weight matrix.</div><div>Five models were developed which include four semi-parametric with flexible intercept and one parametric base model for comparison purposes. The four semi-parametric models entailed two models with a popular specification of stick-breaking Dirichlet process (DP) and two models with an alternative approach of Dirichlet distribution (DD), which are first applied in the field of traffic safety. All four models were estimated for mixture of points (discrete) and mixture of normals (continuous). The posterior density plots for the precision parameter justified the employment of the flexible Dirichlet approach to fit the crash data and supported the assumed prior for the precision parameter. All four Dirichlet models demonstrated the presence of distinct subpopulations suggesting that the intercepts of the models were not generated from a common distribution. The DP model based on mixture of normals illustrated better performance indicating its potential superiority to fit both in-sample and out-of-sample crash data. This finding indicated that the approach of continuous densities, unlike discrete points, may lend more flexibility to fit the data.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"12 1","pages":"Pages 151-166"},"PeriodicalIF":7.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Skid resistance performance and texture lateral distribution within the lanes of asphalt pavements","authors":"Di Yun , Liqun Hu , Ulf Sandberg , Cheng Tang","doi":"10.1016/j.jtte.2021.03.010","DOIUrl":"10.1016/j.jtte.2021.03.010","url":null,"abstract":"<div><div>The skid resistance and pavement texture can vary a lot for different lane paths, meaning that the lateral shift of the vehicle driving in the lane section can affect the safety significantly. On the other hand, a varying skid resistance across a lane section provides the opportunity to influence vehicles to run in lateral positions where the tire/road friction has not yet been reduced by wear; thus, improving safety. This measure would be useful only if the distribution of skid resistance and pavement texture in the lane sections are investigated at frequent intervals.</div><div>This study focused on four test sections on in-service urban roads. A friction measuring device known as the T2GO system was used to test the skid resistance performance of pavements for both dry and wet conditions. A high-precision 3D-scanner was used to capture the pavement macrotexture, and a microscope was employed to investigate the pavement abrasion. Subsequently, the effect of the lateral variation across the lane of friction and texture was discussed. The feasibility of displacing the vehicles to run in tracks with better skid resistance was explored in terms of the measured friction and the texture-dependent drainage capacity. The results indicated that driving closer to the lanes' right side means that better values of friction, texture, and drainage parameters of the unworn pavement surface can be utilized. A 0.3 m or more lateral displacement would create improved friction, in a range between 13% and 14% for 1.5 m track width and between 8% and 11% for 1.65 m track width. Furthermore, the results are useful in studying the vehicles' sideslip.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"12 1","pages":"Pages 87-107"},"PeriodicalIF":7.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wenbo Ma , Xuan Zhou , Jiaping Li , Yanli Chen , Yuyang Li , Caiqian Yang , Minke Ma , Jiale Long , Shuaicheng Guo
{"title":"Study on interface shear strength between polyurethane treated and original Pisha sandstone under dry-wet cycles","authors":"Wenbo Ma , Xuan Zhou , Jiaping Li , Yanli Chen , Yuyang Li , Caiqian Yang , Minke Ma , Jiale Long , Shuaicheng Guo","doi":"10.1016/j.jtte.2021.12.007","DOIUrl":"10.1016/j.jtte.2021.12.007","url":null,"abstract":"<div><div>Currently, utilization of hydrophilic polyurethane (W-OH) materials for slope protection in arid areas has proved to be a cost-effective protocol. The treatment effect highly depends on the interfacial performance between the W-OH treated and the original sandstone. This study aims to investigate the corresponding shear strength and its long-term performance under dry-wet cycles under the arid environment. The results from the direct shear test indicate the interface shear strength increases with W-OH solution concentration and decreases with the increase of water content of the Pisha sandstone. Further investigations under dry-wet cycles indicate the interface cohesion is obviously weakened by the dry-wet cycles, while the influence on the internal friction angle is not obvious. The correlation between the degradation level and the dry-wet cycles can be well fitted with the inverted S-curve using two combined exponential functions. Furthermore, the ethylene-vinyl acetate (EVA) content is utilized to enhance the durability performance under dry-wet cycles. It is found the EVA can obviously improve the bonding property and the resistance to dry-wet cycles. This study’s results can serve as a solid base for the application of W-OH materials to resolve the soil erosion in the arid region.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"12 1","pages":"Pages 108-122"},"PeriodicalIF":7.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yingjun Jiang , Kejia Yuan , Jiangtao Fan , Chenfan Bai , Wei Zhang , Jinshun Xue
{"title":"Deformation properties of remolded loess compacted via vertical vibration compaction method","authors":"Yingjun Jiang , Kejia Yuan , Jiangtao Fan , Chenfan Bai , Wei Zhang , Jinshun Xue","doi":"10.1016/j.jtte.2022.04.001","DOIUrl":"10.1016/j.jtte.2022.04.001","url":null,"abstract":"<div><div>To investigate the deformation properties of remolded loess subgrade under long-term cyclic dynamic loading, remolded loess specimens compacted via vertical vibration compaction method were produced and some factors influencing elastic strain and cumulative plastic strain, which include the number of vibration cycles, depth, and water content, have been investigated. A prediction model for cumulative plastic deformation was established. In addition, the collapsible deformation properties of remolded loess were investigated. Results indicate that the elastic strain and plastic strain are decreased with increasing vibration cycles and depth and finally tend to be stable when the number of vibration cycles is more than 2000 and the depth exceeds 2.5 m. The elastic strain and cumulative plastic strain of compacted loess are increased by 7.2% and 13.0%, respectively, when the water content increases by 1.0%. The cumulative plastic deformation of remolded loess follows a logarithmic distribution. The elastic deformation and cumulative plastic deformation of loess subgrade are far less than the demands for elastic deformation and post-construction settlement of subgrade. As the compaction coefficient and water content are increased by 1.0%, the collapsibility coefficient of compacted loess is decreased by an average of 13.7% and 14.5%. Such investigations can prevent subgrade diseases and ensure the safety of subgrade filled with loess soils.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"12 1","pages":"Pages 123-138"},"PeriodicalIF":7.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Empirical comparison of the effects of other party's vehicle type on motorcyclists' injury severity","authors":"Thanapong Champahom , Chamroeun Se , Wimon Laphrom , Duangdao Watthanaklang , Sajjakaj Jomnonkwao , Vatanavongs Ratanavaraha","doi":"10.1016/j.jtte.2023.11.007","DOIUrl":"10.1016/j.jtte.2023.11.007","url":null,"abstract":"<div><div>This research explores the various factors influencing the severity of injuries motorcyclists sustain across different collision scenarios. The study considers the types of vehicles involved, including motorcycle (MC), cars, pickup trucks, vans, and trucks. The study is grounded in an analysis of road crashes in Thailand from 2016 to 2019. Recognizing the unique characteristics inherent in each collision type, the study categorizes crashes into six distinct models for a comprehensive analysis. Each model is constructed using the random parameter logit with unobserved heterogeneity in means. Notably, all models incorporate random parameters, with the exception of the MC vs. truck model. Despite some consistent factors across most models, there are noteworthy variations in parameters when comparing different vehicle types. In the context of single-motorcycle crashes, speed limit violation emerges as a critical factor. For the MC vs. MC model, crashes happening from midnight to early morning are significant. The presence of a passenger (pillion) is a key determinant in the MC vs. car model. Meanwhile, in the MC vs. pickup truck model, crashes occurring under poor light conditions from midnight to early morning are of particular importance. The MC vs. van model notably highlights the involvement of male riders. Lastly, the MC vs. truck model draws attention to crashes happening on weekends. By creating specific crash models for diverse vehicle types, this study enhances our understanding of motorcycle crashes. The findings provide valuable insights to inform the development of policies, the design of safety campaigns, the creation of training programs, and the evaluation of road safety.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"12 1","pages":"Pages 180-200"},"PeriodicalIF":7.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Real-time traffic enhancement scheduling for train communication networks based on TSN","authors":"Deqiang He, Zeqian Chen, Daliang Sun, Zhenzhen Jin, Yanjun Chen, Rui Ma, Chen Liang","doi":"10.1016/j.jtte.2023.02.009","DOIUrl":"10.1016/j.jtte.2023.02.009","url":null,"abstract":"<div><div>With the increasing data volume of train on-board system, real-time performance has become the most critical factor to ensure the safety of train operation. Considering that standard Ethernet cannot meet the real-time requirement of existing train communication network (TCN), the time-sensitive network (TSN) technology for TCN is introduced. To solve the time-delay problem, an adaptive switch queue selection mechanism for traffic scheduling is proposed. Firstly, the topology model of TCN based on TSN and the traffic model are described. Then, the <em>K</em> shortest path routing algorithm based on load balancing provides the optimal routing for the scheduling process. Finally, the adaptive switch queue selection mechanism is introduced to solve the aggregation flow conflict problem effectively, queue resources are properly allocated, and the gate control list (GCL) of each frame in the queue is obtained. Experimental results show that compared with the traditional constraint model, the schedulability of the model with an adaptive switch queue selection mechanism increases by 33.0%, and the maximum end-to-end delay and network jitter decrease by 19.1% and 18.6% on average respectively. It can provide theoretical support and application reference for the real-time performance optimization of TCN based on TSN.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"12 1","pages":"Pages 34-51"},"PeriodicalIF":7.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yaru Liang , Qunsheng Wang , Jing Zeng , Bin Zhu , Rancheng Mao
{"title":"Study on the improvement of semi-Hertzian wheel/rail contact algorithms","authors":"Yaru Liang , Qunsheng Wang , Jing Zeng , Bin Zhu , Rancheng Mao","doi":"10.1016/j.jtte.2022.08.006","DOIUrl":"10.1016/j.jtte.2022.08.006","url":null,"abstract":"<div><div>The normal stress distribution of the contact patch is the base for wheel/rail dynamic analysis as well as the wheel wear calculation. When the wheel polygonalization appears on the worn-type wheel tread of the high-speed trains, the lateral and longitudinal relative wheel/rail curvature around the contact patch will vary with the change of wheel circumferential position. In such a case, the commonly used Hertzian contact method cannot meet the calculation precision, while even the non-Hertzian method has relatively high precision, but its calculation efficiency cannot meet the demand of engineering application. A non-Hertzian method was introduced to analyze the influence of the wheel polygonalization on the contact patch. By studying the shape and the pressure distribution of the contact patches at different contact positions, it is found that when the wavelength of the wheel polygonalization is larger than 65 mm, the results of the improved semi-Hertzian method can agree well with the non-Hertzian method with reasonable computing time. Besides, to ensure that the calculation result can meet the accuracy requirement when the wheelset yaw motion occurs, the trace method is used to improve the semi-Hertzian method and verified by the contact method.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"12 1","pages":"Pages 23-33"},"PeriodicalIF":7.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aliyu Mani Umar , Mohd Khairul Afzan Mohd Lazi , Sitti Asmah Hassan , Hanini Ilyana Che Hashim , Yinggui Zhang
{"title":"A bibliometric analysis of railway safety research: Thematic evolution, current status, and future research directions","authors":"Aliyu Mani Umar , Mohd Khairul Afzan Mohd Lazi , Sitti Asmah Hassan , Hanini Ilyana Che Hashim , Yinggui Zhang","doi":"10.1016/j.jtte.2024.07.001","DOIUrl":"10.1016/j.jtte.2024.07.001","url":null,"abstract":"<div><div>This study reports a bibliometric analysis of a sample of 787 articles from the Web of Science database. Railway safety is a broad research field with high research activity. Computer-assisted techniques such as bibliometric analysis could be used to study the thematic evolution and intellectual structure of such high-activity research fields. This study aims to identify recent advances in railway safety research and suggest future research directions. We first set out to identify the themes that define railway safety research through science mapping. Using citation count and PageRank of articles, the most prestigious articles published within the last decade were identified for content analysis. Studies on artificial intelligence applications to railway safety, particularly in hazard identification, infrastructure and equipment control, and condition monitoring, have gained traction in recent years. The security and safety of proposed cyber-physical systems for railway applications have been widely studied. Studies on next-level train control systems such as ETCS-3 and CTCS-4 have focused on satellite-based train localization and 5G technology (and beyond) for railway communication systems. Research on human reliability in railway operations and management has also received considerable attention from researchers. However, little consideration is given to addressing issues related to the reliability of expert judgments–a key instrument in practical railway safety assessment. In the end, we suggest six avenues for future research in railway safety.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"12 1","pages":"Pages 1-11"},"PeriodicalIF":7.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hanizah Osman , Muhamad Zulfatah Izham Muhamad Rodzey , Mohd Rosli Mohd Hasan , Tracy Leh Xin Wong , Mohd Fahmi Haikal Mohd Ghazali , Zulfirdaus Zakaria , Mohammed Jameel
{"title":"Review of bonding behavior, mechanisms, and characterization approach in bituminous materials under different conditions","authors":"Hanizah Osman , Muhamad Zulfatah Izham Muhamad Rodzey , Mohd Rosli Mohd Hasan , Tracy Leh Xin Wong , Mohd Fahmi Haikal Mohd Ghazali , Zulfirdaus Zakaria , Mohammed Jameel","doi":"10.1016/j.jtte.2024.06.002","DOIUrl":"10.1016/j.jtte.2024.06.002","url":null,"abstract":"<div><div>Bituminous materials play a crucial role in the construction industry, serving as essential binders in asphalt mixtures. Understanding their bonding behavior, mechanism, and characterization is imperative for enhancing pavement performance, durability, and sustainability. Despite the widespread use of bituminous materials, challenges persist in optimizing their physical, rheological, and mechanical properties, addressing aging effects, and developing eco-friendly alternatives. The modification can be made by incorporating modifiers or additives, such as anti-stripping agents, surfactants, and bonding promoters, at their optimal dosages. Technically, the cohesion and adhesion bonds could be reinforced by adding a designated percentage of additives to the asphalt binder and within the asphalt-aggregate interfaces in asphalt mixtures. Prior to improving the pavement materials for road construction, adhesion and wetting properties also need to be given crucial attention. The inter-surface characteristics and their morphological behavior significantly influence the adhesion and cohesion bonding within binder-aggregate matrices, as indicated by the good correlations in both dry and wet conditions between failure pattern and bond strength. This review highlights recent breakthroughs in bituminous material research, emphasizing innovative approaches to enhance performance, durability, and environmental compatibility, providing insights for future advancements in asphalt pavement engineering. To advance the development of robust, environmentally sensitive asphalt pavements and guarantee a sustainable and effective transportation infrastructure for years to come, cooperation between researchers, engineers, and industry stakeholders is important.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"11 6","pages":"Pages 1291-1316"},"PeriodicalIF":7.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143356964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Evaluation of fatigue life of asphalt binders using the time sweep and linear amplitude sweep tests: A literature review","authors":"Mohammed Nouali , Anne Dony , Alan Carter","doi":"10.1016/j.jtte.2024.04.007","DOIUrl":"10.1016/j.jtte.2024.04.007","url":null,"abstract":"<div><div>Asphalt binders play a crucial role in the fatigue cracking resistance of asphalt pavement, making the characterization of their fatigue life increasingly important. To evaluate the fatigue life of asphalt binders, two tests have been developed: the time sweep (TS) and the linear amplitude sweep (LAS), both conducted using the dynamic shear rheometer (DSR). Similar to asphalt mixtures, predicting the fatigue life of asphalt binders necessitates the predefinition of fatigue failure criterion and/or fatigue failure definition (failure point). Phenomenological and dissipated energy-based failure criteria are commonly employed to analyze TS test results, while the viscoelastic continuum damage (VECD) model is primarily used to predict fatigue life through the LAS test. Given that the fatigue test temperature significantly impacts the fatigue life of asphalt binders, various methods have been proposed in the literature for selecting the fatigue test temperature.</div><div>This paper provides a comprehensive review of the fatigue life evaluation of asphalt binders using both TS and LAS tests. It summarizes the different fatigue failure criteria and fatigue failure definitions employed and discusses the selection of fatigue test temperatures. Furthermore, the paper examines the influence of fatigue test conditions, binder chemical composition and/or penetration grade, and bitumen modification on the fatigue life of asphalt binders. Based on the current review, it is recommended to utilize the LAS test on PAV-aged bitumen under strain-controlled conditions to evaluate the fatigue life of asphalt binders. The most relevant failure definition is the peak in stored pseudo-strain energy based on the simplified viscoelastic continuum damage model (S-VECD). Additionally, the authors propose conducting the fatigue test at an intermediate reference temperature for each country or region, depending on its climate zone.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"11 6","pages":"Pages 1210-1242"},"PeriodicalIF":7.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143324046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}