IATSS ResearchPub Date : 2025-10-01Epub Date: 2025-09-13DOI: 10.1016/j.iatssr.2025.08.001
Mehraab Nazir, Sai Chand, Rahul Goel
{"title":"Quantifying the road network structure and its impact on road traffic crashes: A Bayesian CAR modelling approach","authors":"Mehraab Nazir, Sai Chand, Rahul Goel","doi":"10.1016/j.iatssr.2025.08.001","DOIUrl":"10.1016/j.iatssr.2025.08.001","url":null,"abstract":"<div><div>Road traffic crashes (RTCs) are a major cause of fatalities worldwide. However, the influence of the road network structure on RTCs has not been adequately explored. Furthermore, methodologies employed in earlier studies to quantify road networks have often relied on visual inspection, which is both subjective and impractical. Therefore, this study aimed to address these gaps by (1) utilizing graph theory metrics to quantify the road network structure and (2) developing a statistical model to determine how various characteristics of the network structure—such as connectivity, density, complexity and centrality—are correlated with RTCs while accounting for over-dispersion and spatial auto-correlation. Using a Bayesian conditional auto-regressive model, a spatial analysis of fatal RTCs was conducted at the ward level in Delhi, India. The findings demonstrated a significant positive association between road network connectivity and fatal crash risk. Areas with a higher density of intersections involving major roads were linked to a greater number of fatal crashes. Furthermore, areas with a higher number of intersections deviating from the typical 90-degree angle (higher skewness) were associated with a higher incidence of fatal RTCs. Conversely, an efficient network structure (lower circuitry) and higher network centrality were negatively correlated with fatal RTCs. In addition, wards with a mix of higher-category and lower-category roads (increased entropy) faced an increased risk of fatal crashes. In summary, this study underscores the significant impact of network structure on road safety outcomes. Based on the findings, the study offers policy recommendations for developing targeted road safety measures to address the issues identified via network analysis.</div></div>","PeriodicalId":47059,"journal":{"name":"IATSS Research","volume":"49 3","pages":"Pages 374-386"},"PeriodicalIF":3.3,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145050151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Average travel speed and traffic accident risk: Evidence from nationwide data for trunk highways and expressways in Japan","authors":"Shinya Yamada , Ayanori Sakashita , Takayoshi Tsuchiya , Hironori Kato","doi":"10.1016/j.iatssr.2025.09.006","DOIUrl":"10.1016/j.iatssr.2025.09.006","url":null,"abstract":"<div><div>This study empirically analyzed the determinants of traffic accident risk, highlighting the average travel speed, using nationwide data for trunk highways and expressways in Japan. Negative binomial regression models were established using data describing traffic accidents on 86,835 trunk-highway links, 84,091 trunk-highway intersections, and 4322 expressway links occurring from 2019 to 2021. The results indicated that the average travel speed had a significantly negative association with the annual frequency and rates of traffic accidents regardless of the road type, road median presence, or area characteristics. Furthermore, the speed limit was positively associated with the traffic accident risk on trunk highways, while it was negatively associated with the traffic accident risk on expressways. Finally, the presence of road median reduced the traffic accident risk, and more urbanized areas exhibited a higher risk of traffic accidents than less urbanized areas. Policy implications of these findings include the mitigation of trunk-highway traffic congestion to reduce the traffic accident risk and the potential benefit of increasing the speed limit on traffic safety in expressways.</div></div>","PeriodicalId":47059,"journal":{"name":"IATSS Research","volume":"49 3","pages":"Pages 425-435"},"PeriodicalIF":3.3,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Analysis of traffic crashes considering the field of view","authors":"Andreas Keler , Daijiro Maeda , Satoshi Nakao , Kei Yasuda , Jan-Dirk Schmöcker","doi":"10.1016/j.iatssr.2025.07.002","DOIUrl":"10.1016/j.iatssr.2025.07.002","url":null,"abstract":"<div><div>Road transportation plays an indispensable role in people's lives as it forms the backbone of regions and towns, shapes the environment and landscape, and supports daily life and economic activities. However, it also constantly carries the risk of traffic crashes, making it an ongoing social issue amidst the development of road transportation. While there has been a decreasing trend in the number of traffic crashes and fatalities in recent years, many traffic crashes still occur, with over half of them happening at intersections or nearby. Past research on traffic crashes around intersections has predominantly focused on large-scale intersections, lacking sufficient analysis on small-scale intersections in residential areas due to data limitations. Therefore, in this study, we aggregated OpenData-based intersection representations for obtaining the number of corner cuts (so called “sumikiri” in Japan) via a computational-geometric approach for relating them to nearby-situated facilities and finding relationships between visibility characteristics and the number of traffic crashes, particularly focusing on small-scale intersections. The multiple linear regression analysis revealed that while the number of corner cuts did not show a significant impact on the number of traffic crashes at large-scale intersections, they had a statistically significant negative impact on traffic crashes at medium to small-scale intersections. This implies that intersection size influences the impact of corner cuts (i.e., visibility) on traffic crash occurrence. The results of this study suggest a potential relationship between the corner cut and the occurrence of traffic crashes at medium to small-scale intersections, providing insights that could contribute to future traffic crash prevention strategies.</div></div>","PeriodicalId":47059,"journal":{"name":"IATSS Research","volume":"49 3","pages":"Pages 305-313"},"PeriodicalIF":3.3,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145005197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
IATSS ResearchPub Date : 2025-10-01Epub Date: 2025-10-03DOI: 10.1016/j.iatssr.2025.09.005
Ron Schindler , Giulio Bianchi Piccinini , Laurent Decoster
{"title":"An investigation of truck drivers' behaviour before and during real-world advanced emergency braking system interventions","authors":"Ron Schindler , Giulio Bianchi Piccinini , Laurent Decoster","doi":"10.1016/j.iatssr.2025.09.005","DOIUrl":"10.1016/j.iatssr.2025.09.005","url":null,"abstract":"<div><div>Advanced emergency braking systems (AEBS) aim to address rear-end collisions, which are the most common crash type involving heavy good vehicles. Although previous studies have investigated the safety benefits introduced by AEBS, there is a lack of research exploring drivers' behaviour before and after AEBS interventions. In this paper, we analyzed 6-s long event-triggered naturalistic driving data, collected from heavy goods vehicles every time an AEBS braking intervention occurred, either as preliminary mitigation braking (pMB) or full mitigation braking (MB). The analyses focused on rear-end critical situations in which the drivers did not brake before a collision warning (CW) or a mitigation braking was triggered by the system. The rear-end critical situations encompassed scenarios where the lead vehicle was the same for the whole duration of the event.</div><div>The results show that full mitigation braking are rare events, occurring in approximately 5 % of the complete dataset. Besides, drivers of heavy goods vehicles are in 75 % of the cases already braking before the intervention of CW. Analyzing in detail a restricted number of interventions from CW and MB, it was found that drivers are keeping headway shorter than 1 s in 44.4 % and 53.6 % of the cases respectively. The annotations performed on the restricted dataset indicate that the drivers were “out of the loop” in 57.3 % of CW interventions and 65 % of MB interventions. However, this finding should be taken with caution, due to the lack of video recordings: in fact, the lack of a fast drivers' response could also be an indication of overtrust in the system or a sign of the drivers assessing the situation as not enough critical to require a braking. Further naturalistic driving studies with increased data frequency and availability of video data are recommended to investigate deeper on this matter.</div></div>","PeriodicalId":47059,"journal":{"name":"IATSS Research","volume":"49 3","pages":"Pages 418-424"},"PeriodicalIF":3.3,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
IATSS ResearchPub Date : 2025-10-01Epub Date: 2025-09-12DOI: 10.1016/j.iatssr.2025.09.003
Mohamed Ahmed Al-Awad , Mohamed Kharbeche , Faris Tarlochan
{"title":"Evaluating child restraint system (CRS) adoption and policy interventions worldwide: a review","authors":"Mohamed Ahmed Al-Awad , Mohamed Kharbeche , Faris Tarlochan","doi":"10.1016/j.iatssr.2025.09.003","DOIUrl":"10.1016/j.iatssr.2025.09.003","url":null,"abstract":"<div><div>The global disparity in Child Restraint System (CRS) adoption contributes directly to variations in road traffic mortality and morbidity among children. Despite the proven effectiveness of CRS in reducing harm, its adoption remains inconsistent across regions due to socio-economic, legislative, and cultural factors. This review evaluates global CRS adoption rates, identifies barriers to effective utilization, and explores interventions to enhance usage and legislative compliance, ultimately proposing strategies to improve child passenger safety.</div><div>A total of 93 articles published between 2013 and 2024 were reviewed, with a focus on CRS usage and intervention patterns, the effectiveness of interventions, and legislative impact across high, middle, and low-income countries.</div><div>The review highlights a significant gap in CRS usage between high-income and low to middle-income countries, with affordability, lack of awareness, and inadequate legislation as primary barriers. High-income regions showed better adherence but struggled with proper installation and misuse. Intervention strategies, including legislation, public education, and economic incentives, showed varying success in improving CRS adoption.</div><div>Enhancing global CRS usage requires stringent legislation, comprehensive campaigns, economic support, and innovative technological solutions. Tailored strategies that account for regional socio-economic and cultural norms are essential to achieve widespread adoption and proper CRS use, ultimately reducing child passenger fatalities and injuries.</div></div>","PeriodicalId":47059,"journal":{"name":"IATSS Research","volume":"49 3","pages":"Pages 362-373"},"PeriodicalIF":3.3,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145050150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"An analysis of COVID-19 effects on the trends of traffic violations","authors":"Masoud Foroutan Shad , Mahmoud Mesbah , Mahdie Asl-Javadian","doi":"10.1016/j.iatssr.2025.06.005","DOIUrl":"10.1016/j.iatssr.2025.06.005","url":null,"abstract":"<div><div>Traffic violations can pose significant challenges to public safety and road infrastructure. The consequences of such violations may be managed based on the insights from their observed trends. Following the COVID-19 outbreak and changes in driving behavior, the violation patterns were affected. This study examines traffic violations in the Isfahan province of Iran between 2016 and 2022, focusing on seat belt and speeding violations. Two analytical approaches, time series analysis and count data modeling, were employed to explore various aspects of these violations. Time series analysis involved analyzing aggregated monthly violation records to forecast trends before and during the pandemic. A comparison of projected and observed patterns revealed remarkable shifts in traffic violations, especially after the start of the vaccination campaign in February 2021. This study also found that recording speeding violations was influenced by the maintenance of the speed-control cameras. The second approach focused on police-issued violation records across three periods: two pre-pandemic phases (Pre1 and Pre2) and a pandemic phase (Pand). A set of zero-truncated Poisson models assessed individual and environmental factors in Pre1 and Pre2, such as car type, license plate, driver characteristics, time of day, day type, road hierarchy, and season. The results showed that these factors significantly impacted violation probabilities. To analyze the effects of COVID-19 on these influential factors, another zero-truncated Poisson model was applied to the Pand phase, along with <em>t</em>-tests comparing the coefficients across the three phases. The findings revealed statistically significant changes in how these factors influenced seat belt and speeding violations. Notably, driver characteristics, day type, and season became more determinant for seat belt violations in the Pand phase, while the importance of license plate type decreased.</div></div>","PeriodicalId":47059,"journal":{"name":"IATSS Research","volume":"49 3","pages":"Pages 324-334"},"PeriodicalIF":3.3,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145005199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A new paradigm in driving comfort measurement: Environment-specific comfort index and its real-time application in Indian context","authors":"Ishita Sar , Soumitra Kundu , Aurobinda Routray , Biswajit Mahanty","doi":"10.1016/j.iatssr.2025.09.002","DOIUrl":"10.1016/j.iatssr.2025.09.002","url":null,"abstract":"<div><div>Driving comfort assessment is a prerequisite to improve the journey experience for the drivers as well as the passengers. In this work, we proposed an advanced approach for the measurement of driving comfort in real-time. Different types of environmental features are considered along with the traditionally used Comfort Index (CI), and an Environment-specific Comfort Index (EsCI) is proposed. EsCI is also inversely proportional to the drivers' comfort level, just like CI. We also developed an android application named QDCL (Quantification of Driver Comfort Level) for overall data collection and computation of EsCI from the same. A series of driving experiments at different times of the day and different traffic conditions have been performed in Indian urban road scenarios to assess the performance of QDCL and the relevance of EsCI. We extended the work by studying the effects of different external stimuli on the computed driving comfort level. The performance of EsCI is observed to outperform the traditionally used CI (Comfort Index) in terms of accuracy for the quantification of overall driving comfort.</div></div>","PeriodicalId":47059,"journal":{"name":"IATSS Research","volume":"49 3","pages":"Pages 353-361"},"PeriodicalIF":3.3,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145050149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A study on spatial exploration of elderly drivers at unsignalized intersections considering road and traffic conditions and driver's physical function","authors":"Yasuhiro Mimura , Keiichi Higuchi , Misako Yamagishi , Ryo Ito","doi":"10.1016/j.iatssr.2025.07.003","DOIUrl":"10.1016/j.iatssr.2025.07.003","url":null,"abstract":"<div><div>Unsignalized intersections require more diverse and appropriate physical functions than signalized intersections because traffic is not controlled, and more objects and broader areas must be checked. Elderly drivers may lack adequate physical functions, leading to inadequate spatial exploration and missed recognition, resulting in accidents. This study aims to clarify the spatial exploration behavior of elderly drivers when passing through unsignalized intersections, considering road conditions, traffic conditions, and drivers' physical functions. Participants (<em>n</em> = 62) whose physical function was measured were asked to watch an entry video of 10 intersections using a head-mounted display with eye-tracking function, and the average angular velocity during the viewing was measured. Factorial analysis on spatial exploration showed that the elderly group did not exhibit greater spatial exploration at intersections with acute angles compared to other age groups, even considering physical function effects and traffic conditions through the linear mixed model.</div></div>","PeriodicalId":47059,"journal":{"name":"IATSS Research","volume":"49 3","pages":"Pages 314-323"},"PeriodicalIF":3.3,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145005198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Infrastructure use and related safety feeling of different road user types globally","authors":"George Yannis , Dimitrios Nikolaou , Konstantinos Kaselouris , Gerald Furian","doi":"10.1016/j.iatssr.2025.08.002","DOIUrl":"10.1016/j.iatssr.2025.08.002","url":null,"abstract":"<div><div>Road crashes are a complex phenomenon affected by several parameters that can be categorized into three distinct aspects: road users, vehicles, and road infrastructure. Effective infrastructure enhances safety, accessibility and transportation efficiency. The objective of this paper is to investigate trends in road infrastructure usage and safety perceptions among car drivers and vulnerable road users across different types of roads worldwide. For the study, data from the third edition of the E-Survey on Road Users' Attitudes (ESRA3), conducted in 2023 and covering 39 countries from 5 continents, were utilized. The results revealed that car drivers in Europe have the highest usage of inter-city motorways, while America leads in using thoroughfares and high-speed roads within cities. Moreover, in Europe, rural roads and roads connecting towns and villages are heavily utilized. Moped riders and motorcyclists frequently use urban thoroughfares, especially in America and Europe, whereas cyclists and pedestrians show the highest usage of urban roads with dedicated infrastructure, such as cycle lanes and sidewalks, respectively. Car drivers generally perceive inter-city motorways as relatively safe, while moped riders and motorcyclists perceive thoroughfares within cities as safer in America, compared to Asia-Oceania. Similarly, cyclists express higher safety perceptions on urban roads with cycle lanes, particularly in Europe, and pedestrians consistently feel safest on urban streets and roads with sidewalks. Furthermore, moderate to weak linear relationships were discovered between the perceived safety of road infrastructure and road fatality rates, as well as between the perceived safety of road infrastructure and Gross Domestic Product. Lastly, recommendations for enhancing infrastructure safety, such as road maintenance and upgrades, are provided.</div></div>","PeriodicalId":47059,"journal":{"name":"IATSS Research","volume":"49 3","pages":"Pages 387-398"},"PeriodicalIF":3.3,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
IATSS ResearchPub Date : 2025-07-01Epub Date: 2025-05-30DOI: 10.1016/j.iatssr.2025.05.001
Mohsen Miladi , E. Owen D. Waygood , Marie-Soleil Cloutier , Wang Bobin , Zeinab Ali Yas
{"title":"Distractions or long waits? Impacts on risky crossing behaviour","authors":"Mohsen Miladi , E. Owen D. Waygood , Marie-Soleil Cloutier , Wang Bobin , Zeinab Ali Yas","doi":"10.1016/j.iatssr.2025.05.001","DOIUrl":"10.1016/j.iatssr.2025.05.001","url":null,"abstract":"<div><div>Pedestrian-vehicle conflicts at intersections are considered as a major source of injuries and fatalities. Intersections are a critical part of roadway design since pedestrians are exposed to different and potentially dangerous activities due to how an intersection is designed, but also what the pedestrian is doing and where in the city they are. In this study, various influences on risky crossing behaviour are examined. At the individual level, the influence of distractions and where people are looking before crossing are tested. Further, various intersection design variables including wait time, intersection size and speed limits, and contextual variables such as the built environment nearby and traffic flow are examined. The data was gathered by observing pedestrians at 24 intersections in Montreal and Quebec City (12 each). Logistic regression models were estimated to determine the influencing variables on four dangerous behaviours: a) start on red, b) finish on red, c) finish on red having started on green, and d) cross completely on red. Results demonstrate the importance of wait time on risky crossing behaviour with short wait times (< 30s) decreasing the likelihood of such behaviours considerably. For individual behaviour, having a cellphone in one's hand reduces the likelihood of starting to cross on red. In contrast, looking at traffic was over four times more associated with crossing illegally.</div></div>","PeriodicalId":47059,"journal":{"name":"IATSS Research","volume":"49 2","pages":"Pages 220-230"},"PeriodicalIF":3.2,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}