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Publications
Publications (33)
Gaining insights into pedestrian flow patterns in public spaces can greatly benefit decision-making processes related to infrastructure planning. Interestingly, even pedestrians are unfamiliar with one another, they often follow others, drawing on positive information and engaging in a spontaneous collective behavior of pedestrians. To model this c...
Gaining insights into pedestrian flow patterns in public spaces can greatly benefit decision-making processes related to infrastructure planning. Interestingly, even pedestrians are unfamiliar with one another, they often follow others, drawing on positive information and engaging in a spontaneous collective behavior of pedestrians. To model this c...
The widespread use of energy storage systems in electric bus transit centers presents new opportunities and challenges for bus charging and transit center energy management. A unified optimization model is proposed to jointly optimize the bus charging plan and energy storage system power profile. The model optimizes overall costs by considering bat...
In the literature, automated vehicle (AV) modeling studies tend to depict positive impacts of AV technologies on traffic. However, recent field experiments of production AVs (production vehicles with automated driving features) showed negative impacts on traffic flow stability and capacity. These inconsistencies may hinder the development and deplo...
Automated vehicle (AV) shuttles are emerging mobility technologies that have been widely piloted and deployed. Public attitude is critical to the deployment progress and the overall social benefits of automated vehicle (AV) technologies. The AV shuttle demonstration was regarded as a good way for possible attitude improvements. However, not all exi...
Increasing commercial vehicles are equipped with automated driving features. Adaptive cruise control, a critical longitudinal control system of commercial automated vehicles (AVs), may have significant impacts on fuel consumption. To investigate the impacts, this paper collected high-resolution trajectory data of commercial AVs with different opera...
Autonomous vehicles (AVs) are a promising emerging technology that is likely to be widely deployed in the near future. People's perception on AV safety is critical to the pace and success of deploying the AV technology. Existing studies found that people's perceptions on emerging technologies might change as additional information was provided. To...
Mandatory lane change (MLC) is the core of lane-specific motion planning for connected and autonomous vehicles (CAVs). To model the MLC for CAVs, this paper presented a decentralized cooperative MLC (DC-MLC) framework. The framework aimed to achieve a safe MLC maneuver with multiple-CAV cooperation, including the lane change times, positions, and t...
High-granularity vehicle trajectory data can help researchers develop traffic simulation models, understand traffic flow characteristics, and thus propose insightful strategies for road traffic management. This paper proposes a novel vehicle trajectory extraction method that can extract high-granularity vehicle trajectories from aerial videos. The...
Although urban transit systems (UTS) often have fixed vehicle capacity and relatively constant departure headways, they may need to accommodate dramatically fluctuating passenger demands over space and time, resulting in either excessive passenger waiting or vehicle capacity and energy waste. Therefore, on the one hand, optimal operations of UTS re...
Increasingly, commercial vehicles are equipped with automated vehicle (AV) features such as adaptive cruise control systems. The AV feature can automatically control the headway between the current vehicle and the preceding vehicle in an adaptive manner. The automatic control may lead to significantly different car- following motions compared with...
High-accuracy long-coverage vehicle trajectory data can benefit the investigations of various traffic phenomena. Due to the shortage of trajectory connection methods, most of the existing vehicle trajectory datasets include plenty of broken vehicle trajectories, which may restrict the analyses of traffic dynamics and the validations of correspondin...
A recent study (Li, 2020) analytically predicted tradeoffs between automated vehicle (AV) following characteristics on safety, mobility, and stability using a parsimonious linear car-following model. This work aimed to verify the key theoretical findings in the above study with empirical experiments using commercial AVs, e.g., vehicles with adaptiv...
Increasing commercial vehicles are equipped with automated driving features. Adaptive cruise control, a critical longitudinal control system of commercial automated vehicles (AVs), may have significant impacts on fuel consumption. To investigate the impacts, this paper collected high-resolution trajectory data of commercial AVs with different opera...
We propose a trajectory extraction method to extract long vehicle trajectories from aerial videos. The proposed method includes video calibration, vehicle detection and tracking, lane identification, and vehicle position calibration. The proposed method is applied to several high-resolution aerial videos in the numerical example, including the new...
Rapid and on-time baggage transportation plays a crucial role in ensuring customer satisfaction and is an important source of greenhouse gas (GHG) emissions in the aviation sector. Modular vehicle (MV) is an emerging transportation technology that allows vehicles to adjust their capacity flexibly by assembling or disassembling identical detachable...
Autonomous vehicles (AVs) are a promising emerging technology that is likely to be widely deployed in the near future. People's perception on AV safety is critical to the pace and success of deploying the AV technology. Existing studies found that people's perceptions on emerging technologies might change as additional information was provided. To...
A recent study (1) analytically predicted trade-offs between automated vehicle (AV) following characteristics on safety, mobility and stability by a parsimonious linear car following model. This work aims to test the key theoretical findings in the above study with empirical experiments using commercial AVs, e.g., vehicles with adaptive cruise cont...
Since passenger demand in urban transit systems is asymmetrically distributed across different periods in a day and different geographic locations across the cities, the tradeoff between vehicle operating costs and service quality has been a persistent problem in transit operational design. The emerging modular vehicle technology offers us a new pe...
While urban transit systems (UTS) often have fixed vehicle capacity and relatively constant departure headways, they may need to accommodate dramatically fluctuating passenger demands over space and time, resulting in either excessive passenger waiting or vehicle capacity and energy waste. Therefore, on the one hand, optimal operations of UTS rely...
Intelligent Vehicle (IV) is expected to revolutionize the way vehicles operating in the next few decades. The most commonly used method to test the functionality of the IV is to use the IV testbed for operable and economic reasons. However, the traditional testbed only has the ability to test the longitudinal movement and is not capable of studying...
In recent years, researchers have devoted considerable attention to identifying the causes of urban environmental pollution. To determine whether migrant populations significantly affect urban environments, we examined the relationship between urban environmental pollutant emissions and migrant populations at the prefectural level using data obtain...
Connected and automated vehicle (CAV) technologies have been developed to improve traffic safety, mobility, and environmental impacts throughout the years. One of the enabling CAV technologies is the lane-changing function, which has attracted much attention from both industry and academia in recent years. This paper provides an overview of represe...
Connected and Automated Vehicle (CAV) technologies have been developed to improve traffic safety, mobility, and environmental impacts throughout the years. One of the enabling CAV technologies is the lane-changing function, which has attracted much attention from both industry and academia in recent years. This paper provides an overview of represe...
Railway passenger transportation plays a fundamental role in China, reasonable revenue is the guarantee of railway's regularly development such as equipment replacement, technology enhancement, etc. Although many studies on the railway revenue models have been conducted, there is a lack of effective modeling which considers the multiple trains and...