Journal of Traffic and Transportation Engineering-English Edition最新文献

In order to understand the current research status and development direction of driving risk identification at home and abroad, relevant literatures in the field of driving risk identification from the China National Knowledge Infra-structure (CNKI) and Web of Science (WOS) in recent 12 years (2011–2022) were selected as research samples, and literature metrology tools VOSviewer and Citespace were used for visual analysis. The situation was analyzed from the aspects of chronological distribution, national cooperation network, distribution of domestic institutions, journal performance and keywords overview, literature coupling clustering and research hotspots. The results show that the number of published papers fluctuates year by year, and China, the United States and Germany have the largest number of published papers. The United States is at the center of international cooperation. The CNKI shows that universities in China such as Chang'an University and Chongqing Jiaotong University have published a large number of documents. According to the statistics of WOS, Accident Analysis & Prevention is the most widely published journal in the world. The average level of the journal is high and the quality of articles is better. Combining the research contents of CNKI and WOS, the main research directions can be clustered into five cluster themes by using the coupling function in VOSviewer, including driving risk assessment considering driver factors, the influence of driving environment on driving risk, driving risk assessment considering multi-source characteristic data, multi-aspect research on driving risk and risk identification of non-traditional vehicles in specific scenarios. Human-machine co-driving, artificial intelligence, intelligent driving, risk identification and natural driving are the current research hotspots and the future research trends.

Identification of accident black spots has gained tremendous popularity among road agencies and safety specialists for evaluating and subsequently enhancing road traffic safety. However, there is still limited understanding of the internal relationship between black spots and microscopic vehicle kinetic parameters. To address this gap, this paper describes a project that was undertaken using the real-time tire force data (kinetic response) obtained from road experiments on Wenli Expressway. First, factor analysis was applied to extracted three independent indicators (power-braking, handling stability, and ride comfort) from seven original kinetic indicators with multiple collinearities. Afterward, the main indicators were given vehicle kinetic meaning by analyzing the characteristics of original indicators associated with them. A compelling correlation was established among kinetic parameters, vehicle running qualities, and accident risk. Additionally, an integrated evaluation framework was established to identify accident black spots based on applying ordered logit models and PLS-entropy-TOPSIS approaches. The recognition results exhibited that the overall recognition accuracy obtained by the latter was found to be comparable to that achieved using the previous one. The compound evaluation model proposed in this paper has been proven to present many advantages for black spot identification. It is evidently clear from the findings that the vehicle kinetic parameters have significant correlations with road accident risk. This paper could provide some insightful knowledge for identifying and preventing the black spots from ameliorating traffic safety.

Based on the four-element model, this paper reviewed the important research progress in vehicle platoon, compared the advantages and disadvantages of different models in each element longitudinally, and summarized the linkage between each element horizontally. The stability criteria are briefly reviewed from three dimensions: local stability, string stability, and traffic flow stability. The impact of communication delay on vehicle platoon is quantitatively summarized from two aspects: the variation of controller gains and the variation of headway time values. Aiming at the inevitable communication delay in vehicle platoon, the compensation strategies are analyzed from five levels. (1) Optimizing the communication network structure. (2) Reconstructing acceleration information. (3) Tuning controller gains. (4) Constructing a multi-branch selection structure. (5) Improving the controller. The results show that, although these compensation strategies can alleviate the negative impact of communication delay to a certain extent, they also have some defects such as difficulty in adapting to complex and various real road conditions, poor accuracy and real-time performance, insufficient security, and limited application scenarios. It is necessary to further improve the accuracy and real-time performance of the device, design an encrypted and scalable network architecture to ensure communication security and adaptability, and conduct further real vehicle testing.

The temperature change caused by hydration leads to early-age cracking in concrete box girder. The early-age cracking risk is further improved with low air temperature and large daily temperature difference, especially in Northwest China. To fill this gap, a temperature experiment and numerical simulation were performed on an actual concrete box girder segment in Northwest China. The temperature field, thermal stress and cracking risk were analyzed using evolution curves, distribution curves and contours. The key parameters that influence the hydration heat temperature, including the cement hydration heat release, cement content, height-width ratio of web, initial temperature, convective coefficient of top plate surface, were analyzed. An anti-cracking case based on parameters analysis was put forward. The results indicated that the temperature evolution can be divided into three stages: warming, cooling and environment significantly impacting. Along the thickness of each plate, temperature distributed is single peak in the center. Along the width or height, temperature distributed is double peaks at axillary position for the top and bottom plates, and single peak in center for the web. The axillary position and web have high thermal stress and significant cracking risks. The temperature difference of each plate, and the early-age cracking risk can be reduced by effectively adjusting the key parameters. Among these, the former two parameters are the most significant factors. The maximum cracking risk can be decreased by 15.7% for every 50 kJ/kg hydration heat reduction. The maximum cracking risk can be decreased by 13.1% for every 50 kg/m³ cement content reduction.

The rapid development of the delivery industry brings convenience to modern society. However, the high rates of crashes and the survival of electric bicycle (e-bike) riders in the delivery industry raise concerns. The primary objective of this study is to explore the factors affecting delivery e-bike riders' stressful work pressure and crash involvement in China. Data were collected by a questionnaire survey administered in the city of Ningbo, China. A bivariate ordered probit (BOP) model was developed to simultaneously examine the factors associated with both the working conditions of delivery e-bike riders and their involvement in crashes. The marginal effects for the contributory factors were calculated to quantify their impacts on the outcomes. The results showed that the BOP model can account for commonly unobserved characteristics of the working conditions and crash involvement of delivery e-bike riders. The BOP model results showed that the stressful working conditions of delivery e-bike riders were affected by the number of orders and delivery time and rider age and risky riding behaviors. Delivery rider involvement in crashes was affected by the number of orders, strength of the punishment for traffic violations, and familiarity with traffic regulations. It was also found that stressful working conditions and crash involvement were strongly and positively correlated. The findings of this study can enhance our understanding of the factors that affect the working conditions and delivery rider crash involvement. Based on the results, some suggestions regarding public policy, risky riding behaviors, safety promotion, and stronger corporate governance rules were discussed to increase the targeted safety-related interventions for delivery e-bike riders in Ningbo, China.

Latex as an asphalt modifier has gained popularity in the asphalt industry as it improves the durability of asphalt pavement. However, the elastomeric properties of latex stiffen the asphalt binders, resulting in additional energy consumption during the production of asphalt mixtures, which may cause a higher emission of greenhouse gases. This is undesirable for sustainable development and the environment. In this study, the applicability of diluted methanol and water was comparatively evaluated as foaming agents in the production of warm mix asphalt (WMA) mixtures incorporating latex. Diluted methanol was used because it has a lower boiling point and latent heat than water, allowing the asphalt mixture to be produced at a lower temperature and thus consuming less energy. The performance of the foamed asphalt mixture was investigated through service characteristics, mechanical performance, and moisture susceptibility of mixtures. The service characteristics, on the other hand, were measured in a laboratory while preparing and compacting the asphalt mixture, which refers to the amount of energy required during the production and construction stages in the asphalt plant and on the construction site, respectively. The degree of energy required was assessed based on the workability index, coatability index, and the compaction energy index. The mechanical performance of asphalt mixtures was characterized by indirect tensile strength, resilient modulus, and dynamic creep tests. The resistance to moisture damage was evaluated based on the common parameter, indirect tensile strength ratio. The findings revealed that the use of diluted methanol foaming agent helped improve the workability of latex modified asphalt mixtures. The foamed latex-modified WMA demonstrated better performance compared to asphalt mixtures prepared using water as the foaming agent.

Maintaining the health and reliability of civil facilities is of strategic importance. In highway engineering, pavement cracking impairs the road service and travel comfort level, while structure cracking can cause catastrophic damage. Microcapsule-based self-healing materials offer solutions to auto-recovery micro-cracks and maintain structural health. Such solution has become available by laboratory synthesis and proved effective in addressing the cracking problem during long-term mechanical, thermal, and hydraulic conditions. However, full-scale applications of this technique are not prevalent, showing its potential limitations in highway engineering. Crack healing in highways is a big topic, therefore, this review has two insertion points. (1) We focus on the cracking issues on two specific materials: asphalt and concrete, which account for the vast majority of all the materials used in pavement and structures in highways. (2) Instead of the laboratory studies, we pay more attention to the practical applications, the meaning of healing performance, and the adverse effects of microcapsules to the main structural components (i.e., tunnel lining, bridge piers and beams) and pavement in highways. The practical significance of self-healing materials in highway projects was discussed from the three aspects: strength, durability, and stress redistribution. The difficulty in applying this new technique is also discussed from economic perspective. For future-proofing, a material evaluation system that fits the load condition is required. The self-healing technique brings composites a chance to interact with the environment, showing high potential for contributing to the development of various types of long-lasting infrastructures.

Marble dust waste powder generated by the marble cutting industry has a high alkalinity. In this research, the use of marble dust (MD) as a mineral filler substitute in hot mixed asphalt (HMA) was evaluated. The Marshall mix design was used to determine the optimum bitumen content (OBC) for all of the mixtures. For each of the four MD contents, i.e., 0, 2%, 4%, and 6% by weight of the total aggregates, four different bitumen percentages were used. The results of the Marshall stability test showed that the optimum filler content was 4% MD. Samples were prepared with 0 MD in the control mix and varying percentages of MD as an alternate filler. In addition, MD aided in increasing the Marshall stability, rutting resistance, and permanent deformation and reduced the fatigue life of asphalt mixtures. As the percentage of MD increases, the rutting resistance and stiffness at high temperatures both increase. As the percentage of MD increases, the fatigue life reduces. Rut resistance in high-temperature conditions can be improved by using MD in HMA as a partial substitute for stone dust (SD). In areas where extensive MD waste is present, MD can be incorporated into HMA mixtures instead of conventional fillers.

Over the course of storm or rainfall event, water thickness builds up on road surface resulting in a loss of contact between vehicle tires and road surface and puts drivers into immediate danger especially at high speeds. Therefore this is a considerably dangerous condition of the road and the realistic measurements and prediction model of water film thickness (WFT) on pavement surface is crucial for determining the road friction coefficient and evaluating the impact of rainfall on traffic safety. A review of the principle as well as critical evaluation of current detection methods of pavement WFT were compared for consistency and accuracy in this paper. The method selection guidelines are given for different road surface water film thickness detection requirements. This paper also introduces the latest development of WFT detection and prediction models for asphalt pavement, and gives the calculation elements and conditions of different WFT prediction models from different modeling ideas, which provides a basis for the selection and optimization of WFT models for future researchers. This article also suggests a few insights as further research directions on this topic. (1) The research can consider the influencing factors of WFT to conduct research on the delineation standard of pavement WFT. (2) In order to meet the future traffic safety dynamic early warning needs, road factors of different material types, disease conditions and linear conditions should be studied, as well as a comprehensive and accurate real-time water film thickness detection and evaluation method considering meteorological factors of rainfall timing, scale and intensity. (3) The prediction model of WFT should be further studied by the analytical method to clarify the influence of the pavement WFT on the driving safety.