Xiaobao Yang

Xiaobao Yang
Beijing Jiaotong University | NJTU · School of Traffic and Transportation

PhD

About

63
Publications
11,369
Reads
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917
Citations
Additional affiliations
November 2013 - December 2014
University of Central Florida
Position
  • research visitor
April 2007 - present
Beijing Jiaotong University
Position
  • Professor (Associate)

Publications

Publications (63)
Article
The existing literature has confirmed that extreme weather such as wind, rain, and snow have a negative impact on cross-sectional traffic flow. However, travel activities with different destination regions, travel distances and vehicle types may have different responses to severe weather. We employ the multilevel mixed-effects negative binomial (ME...
Article
Existing literature has confirmed that severe weather events have a negative impact on travel behavior. Considering the features of long distances and long durations, intercity travel may be affected by the weather at the origin (O) point and at the destination (D) point. This paper aims to reveal the relationship between weather and OD volume of i...
Article
Full-text available
For urban rail transit (URT) operation and management, it is important to accurately estimate the spatial and temporal passenger flow distribution spreading all over a URT network. Unfortunately, the literature review shows that the existing simulation-based methods and dynamic assignment methods are not able to satisfactorily achieve the goal. The...
Article
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It is a dangerous behaviour for pedestrians and nonmotorized vehicles to cross intersections without waiting when they arrive at intersections during the red-light period. This paper investigates three typical signalized major-major intersections in the center of Beijing, by collecting and analyzing 1368 samples of pedestrians and nonmotorized vehi...
Article
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Variable message signs (VMSs) are an important means of providing traffic information in order to help drivers to better travel in a transportation network. Effectiveness of VMSs largely depends on the numbers and locations of VMSs in a transportation network. Although a few optimization models have been proposed to find candidate roads to locate V...
Article
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User equilibrium theory is used for modeling transportation demand in urban multimodal network. A mathematical optimization model is constructed to meet user equilibrium condition for such system while considering the competitive relationship between different modes. It is also proved that the optimal solution satisfies the logit based mode-split....
Article
Not only the static factors including road grade, traffic flow, and road operation state, but also the dynamic factor of information attenuation property were considered, a locating algorithm of urban variable message sign (VMS) considering the properties of road sections was proposed. In view of 4 main road properties closely related to the traffi...
Article
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This paper describes the red-light running behavior of bicyclists at urban intersections based on reliability analysis approach. Bicyclists’ crossing behavior was collected by video recording. Four proportional hazard models by the Cox, exponential, Weibull, and Gompertz distributions were proposed to analyze the covariate effects on safety crossin...
Article
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Based on survey data at typical intersections in Beijing, microscopic street-crossing behaviors of bicyclists at signalized intersections are investigated. A total of 470 two-wheeled riders approaching the intersections during red light periods were observed. Chi-square test in crosstab analysis and non-parametric estimation method in survival anal...
Article
Hazard-based duration models are proposed to investigate riders’ waiting times, violation hazards and associated risk factors.•Most riders are prone to terminate waiting duration and run against the red light over the waiting time elapsed.•Rider type, gender, waiting position, conformity tendency and traffic volume have significant effects on waiti...
Article
Habitat fragmentation is a harmful impact on wild animals. In this paper, we propose an agent-based simulation model to estimate the fragmentation impacts (FIs) on wild animals caused by road network. We employ predator-prey system as a simplified ecological system, and investigate FIs on wildlife by adding roads gradually into the habitat of wildl...
Article
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Based on stochastic user equilibrium principle, the route choice and parking choice behaviors of travelers were analyzed, and the urban road parking assignment model meeting the logit relation was set up. Based on the revenue management ideology, the maximum parking revenue was taken as decision target, the bi-level programming model of urban parki...
Article
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This paper considered the impact of transfer times on passengers' travel costs by defining the transfer penalty factor. Different with the traditional studies, the transit assignment model was formulated based on the augmented transit network. The passengers' travel costs including walking time, waiting time, in-vehicle time and transfer time was p...
Article
In this paper, we develop a macro traffic flow model with consideration of varying road conditions. Our analytical and numerical results illustrate that good road condition can enhance the speed and flow of uniform traffic flow whereas bad road condition will reduce the speed and flow. The numerical results also show that good road condition can sm...
Article
We propose to use the neural network to process the data with timing characteristics by analyzing urban rail transit passenger flow timing characteristics and the mechanism of RBF neural network. A parallel weighted neural network model based on passenger flow sequence characteristics is developed. We use this model to forecast the Beijing urban ra...
Article
Full-text available
The paper proposed a model for estimating waiting endurance times of electric two-wheelers at signalized intersections using survival analysis method. Waiting duration times were collected by video cameras and they were assigned as censored and uncensored data to distinguish between normal crossing and red-light running behavior. A Cox proportional...
Article
In this paper, we use empirical data to calibrate the speed-headway function and propose a car-following model to investigate the effects of real-time road condition on each vehicle’s speed, acceleration, headway, fuel consumption, CO, HC and NOX under uniform flow. Numerical results illustrate that real-time road condition produces oscillating phe...
Article
Based on existing traffic flow models, in this paper we develop a macro traffic flow model taking into consideration road capacity to study the impact of the road capacity on traffic flow. The numerical results show that the road capacity destroys the stability of uniform flow and produces stop-and-go traffic under a moderate density and that the r...
Article
The influencing factors and the relationships among them were investigated for the crash risk perception of e-bike riders under different risk situations. An online questionnaire survey was conducted for data collection. Ordered logistic regression (OLR) and principal component analysis (PCA) were used to analyze the crash risk perception of e-bike...
Article
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The scramble crossing of motorized vehicles and the influencing factors at uncontrolled T-shaped intersections under mixed traffic conditions were analyzed based on the video observation. The binary Logistic regression was applied to model the scramble crossing behavior. The results indicate that the motor drivers tend to scramble when encounter pe...
Article
The red-light running behavior of non-motor vehicles and its influential factors were presented. The waiting times of non-motor vehicles and the data of the influential variables were collected by video. Non-parameter method of survival analysis theory was used to model the waiting time. The results show that the violation inclination of most rider...
Article
The hazard-based traffic congestion duration model was established through survival analysis method. Based on the empirical traffic flow data on the Third Ring Road in Beijing, the traffic congestion duration of the Third Ring Road was estimated. The results show that 56% of the congestion durations of road segments on the Third Ring Road are not l...
Article
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This paper presents a crossing reliability model of electric bike riders at urban intersections using survival analysis approach. Riders’ crossing behavior was collected by video cameras. Waiting times in the red-light phase were modeled by reliability-based model that recognizes the covariate effects. Three parametric models by the exponential, We...
Article
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This paper proposes a model for estimating car delays at bus stops under mixed traffic using probability theory and queuing theory. The roadway is divided to serve motorized and nonmotorized traffic streams. Bus stops are located on the nonmotorized lanes. When buses dwell at the stop, they block the bicycles. Thus, two conflict points between car...
Article
In this paper, the structural characteristic of urban multimodal transport system is fully analyzed and then a two-tier network structure is proposed to describe such a system, in which the first-tier network is used to depict the traveller’s mode choice behaviour and the second-tier network is used to depict the vehicle routing when a certain mode...
Article
Full-text available
Traditional system optimization models for traffic network focus on the treatment of congestion, which usually have an objective of minimizing the total travel time. However, the negative externality of congestion, such as environment pollution, is neglected in most cases. Such models fall short in taking Greenhouse Gas (GHG) emissions and its impa...
Article
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In this paper, we develop a new car-following model with consideration of varying road condition based on the empirical data. Firstly, we explore the effects of road condition on uniform flow from analytical and numerical perspectives. The results indicate that road condition has great influences on uniform flow, i.e., good road condition can enhan...
Article
Full-text available
To investigate the relationship between cyclist violation and waiting duration, the red-light running behavior of nonmotorized vehicles is examined at signalized intersections. Violation waiting duration is collected by video cameras and it is assigned as censored and uncensored data to distinguish between normal crossing and red-light running. A p...
Article
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To determine how bus stop design influences mixed traffic operation near Chinese bus stops, a new theoretical method was developed by using additive-conflict-flows procedure. The procedure was extended from homogeneous traffic flow to mixed traffic flow. Based on the procedure and queuing theory, car capacity and speed models were proposed for thre...
Article
Full-text available
Based on empirical data, we develop a macro model with lane width and the number of lanes. For uniform flow, the model is formulated as a couple of algebra equations and solved by analytical deduction. The results show that the proposed model can capture the impacts of lane width, the number of lanes and the variation of the number of lanes on unif...
Article
Full-text available
This paper presents an important investigation into car travel time affected by mixed traffic flow near a bus stop on the basis of survival analysis theory. Travel time data associated with mixed traffic characteristics near a bus stop were collected by video cameras. A hazard-based duration model was introduced to analyze the effects of mixed traf...
Conference Paper
To investigate the relationship between waiting duration and cyclist violation, cyclists' street-crossing behavior was examined by modeling the waiting duration at signalized intersections. Violation waiting duration was collected by video cameras and it was assigned as censored and uncensored data to distinguish between normal crossing and violati...
Article
Full-text available
To investigate bicyclists' behavior at unsignalized intersections with mixed traffic flow, a bicycle capacity model of borrowed-priority merge was developed by the addition-conflict-flow procedure. Based on the actual traffic situation, the concept of borrowed priority, in which the major-road bicycles borrow the priority of major-road cars to ente...
Article
Full-text available
On-street parking is an important component of the parking system. Because of its occupancy of roadway resources, it can significantly impact traffic performance and safety. The aim of this paper is to give a quantitative analysis of the influence of on-street parking on travel time. The travel time data of the motor vehicles moving in the road sec...
Article
Many algorithms have been presented to solve the traffic assignment problem. Recently, Bar-Gera introduced the concept of ``last common node'' into an origin-based algorithm to solve the traffic assignment problem. However, how to find the last common nodes has not been investigated in detail. In this paper, we present a matrix method for finding t...
Article
Real time system for vehicle travel time and traffic flow is an essential part of Intelligent Transportation Systems. In many Chinese cities, the interactions among buses, bicycles and cars bring difficulty to travel time prediction and traffic safety management. The aim of this paper is to develop a new model to estimate car travel time near bus s...
Article
Much research about travel time estimation mainly focuses on basic segments and intersections, and less on bus stops. In this paper, link resistance function near a bus stop under mix traffic conditions was established. To overcome the shortcoming of numerous estimated parameters in the traditional models, the proposed model was transformed to a no...
Article
Full-text available
Real time system for vehicle travel time and traffic flow is an essential part of Intelligent Transportation Systems. In many Chinese cities, the interactions among buses, bicycles and cars bring difficulty to travel time prediction and traffic safety management. The aim of this paper is to develop a new model to estimate car travel time near bus s...
Article
Full-text available
This paper presents an augmented network model to represent urban transit system. Through such network model, the urban transit assignment problem can be easily modeled like a generalized traffic network. Simultaneously, the feasible route in such augmented transit network is then defined in accordance with the passengers’ behaviors. The passengers...
Article
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Article
In this paper, computational models of environmental pollution and energy consumption of urban multimodal traffic network are proposed according to pertinent research and a multi-objective programming model is then developed to formulate optimization problem for such a system. Simultaneously, the main factors, such as travel time, pricing and conve...
Article
Full-text available
To determinate car capacity at bus stops with mixed traffic, a new theoretical approach was developed on the basis of additive-conflict-flows procedure. The procedure was extended from homogeneous traffic flow to mixed traffic flow. The conflicts among cars, buses and bicycles near the stop can be described by the extended procedure. The procedure...
Article
To analyze the lane-crossing behavior of non-motorized vehicles under the influence of curb parking, the lifetime data analysis method is adopted to examine the observed data for non-motorized vehicles. The concept named valid volume is introduced to describe the relation between the probability of lane-crossing behavior and non-motorized vehicle v...
Article
Full-text available
Pedestrian violation is a major cause of traffic accidents involving pedestrians. The research objectives were to investigate the relationship between waiting duration and pedestrian violation and to provide a qualitative and quantitative analysis of the effects of human factors and external environmental factors on street-crossing behavior. Pedest...
Article
Car delay model near a bus bay with mixed traffic is proposed based on queuing theory. Bus stream system is described by an M/M/k queue and the service counter is the bus stop. When buses dwell in the non-motorized lane, the car-bicycle conflict and the car-bus conflict are identified. The conflict between different streams is represented by the ad...
Article
Pedestrian street-crossing behavior is closely related to pedestrian safety and traffic performance. Pedestrians crossing preference is influenced by the type of crossing facilities as well as the accessibility and convenience. Based on the questionnaire and field survey, a discrete choice model for the preference of crossing location and route is...
Article
Full-text available
The structural characteristic of urban multimodal transport system was fully analyzed and then based on graph theory, a hierarchical network was proposed to describe the system. Simultaneously, the complex travelers' choice behaviors including traffic mode choice and route choice were analyzed in hierarchical network and based on the analysis of tr...
Article
Considering the variation of drivers' merging behaviors on the on-ramp of urban expressway, a gap acceptance theory model with variable critical gaps is proposed to measure the on-ramp capacity. When drivers travel along the acceleration lane of an on-ramp, the closer the driver is to the end of the acceleration lane, the stronger the driver's inte...
Article
Full-text available
In many Chinese cities, traffic streams near bus stops differ from those of bus stops in developed countries. There are usually two lanes at a Chinese curbside stop: a nonmotorized lane and a motorized lane. Bus stops are often located on the nonmotorized lane. When a bus dwells at a curbside stop, nonmotorized vehicles, mainly bicycles, will move...
Conference Paper
This paper attempts to investigate the impact of the number of lanes on freeway traffic characteristics. Methodologically, we provide a better understanding of the relationship between freeway traffic characteristics and its number of lanes upon the simulation method. An improved lane-changing model based on the Nagatani's method is proposed. Both...
Conference Paper
The traffic flow characteristics and drivers' behavior between an on-ramp and off-ramp segment are mainly investigated by empirical research. The field data is obtained by the video camera and Metrocount 5710 located at the eastern of Haidian Bridge of Beijing's Fourth Ring Road. From data analysis, it is revealed that the capacity is dropped and a...
Conference Paper
Full-text available
In this paper, we investigate the impact of the number of lanes on traffic characteristics upon empirical study. It turns to the findings that flow and speed per lane decreases marginally with increasing number of lanes on uninterrupted expressway segments. Further it addresses that the increase of lane-changing probability is the principal factor...
Article
Full-text available
This paper attempts to investigate the impact of the number of lanes on highway capacity. Methodologically, we provide a better understanding of the relationship between highway capacity and its number of lanes upon the statistical analysis of the survey. We employ the variance analysis of single factor for modeling the effect of the number of lane...

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