We developed a real-time crash risk prediction model for urban expressways in China this study. About two-year data and their matching traffic sensor from the Beijing section of Jingha expressway were utilized research. The six 5-minute intervals between 0 30 minutes prior to occurrence was extracted, respectively. To obtain appropriate training period, (in each interval) during different periods collected as data, respectively, value under conditions defined. Then we proposed new using...

This study presents a stochastic model based on the link performance function of Bureau Public Roads to assess reliability travel time in transportation network. Empirical studies have verified that variability can be ascribed demand fluctuation and degradation capacity The mean‐variance approach previous research presented budget time, with network elastic as sources uncertainty time. Previous was devoted estimation considering single factor or independent these two sources. Meanwhile, this...

It has been previously documented that under the condition of crossing an uncontrolled intersection, decision-making process drivers is rather complex and highly interactive: they need to decide about timing, direction, strategy complete required maneuver avoid potential conflicts. Given significant impact this behavior on intersection safety capacity, we model merging a straight-moving vehicle facing turning at in China. We expect can predict probability driver preemptive status (i.e.,...

Objective: This study aims to investigate the crossing behavior of straight-moving drivers when they encounter other at unsignalized intersections in China. Background: In China, two vehicle an intersection, neither driver completely stops his or her most cases. Instead, one gradually approaches intersection and dynamically decides either yield preempt by gaming with vehicle. process increases probability accidents. Method: A total 305 cases were collected Kunming City. Motion parameters...

In the dynamic interaction of a driver-vehicle-environment system, risk perception drivers changes dynamically, having significant impacts on driving behavior and vehicles movement. China, because there is less construction stop signs, as well limited regulation courtesy, traffic operation safety issues at unsignalized intersections require harder concern. Thus, in this study, focus was China then analysis movement with consideration drivers’ perception. A total 150 typical merging cases...

A large number of road traffic accidents occur each year in China, which results huge losses to the safety people’s lives and property. Among all accidents, accident with over 10 fatalities one is extraordinarily serious, has immeasurable impact on security. In this paper, we defined these as serious fatal (SF-RTAs). The aim study was analyze SF-RTAs China its provinces investigate causes SF-RTAs. Firstly, described analyzed annual trend based data from 1990 2014. Then region, time type...

Traffic safety has become a severe problem on freeways in China, thus, it is important to establish real-time crash risk model identify traffic conditions causing crashes. In this study, we explore the for urban China and obtain dynamic level. Crash their matching sensor data from Beijing section of Jingha expressway eight 5-min intervals between 0 40 min prior occurrence was extracted during different periods. The value under defined. Then, assessment using decision tree method adaptive...

Driver’s perception error plays a significant role in determining the dynamical properties of platoon vehicles driving on straight road. Therefore, we attempt to understand driver’s errors for vehicle motion state information affecting traffic flow oscillations this study. A real test experiment indicates that drivers have different levels velocity and headway preceding car-following process. Based this, an extended full difference (EFVD) model is used investigate effects from vehicle’s...

Abstract With the development of networking and intelligence, a mixture multi-type vehicles will become normal in road transportation system, which lead to more complex for vehicle motion microscopic traffic system. Therefore, non-connected car-following model is established considering subjective perception errors preceding based on desired safety margin model. Moreover, effective range vehicle-to-vehicle communication considered, connected intelligent multi-vehicles information effect...

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Abstract: In this paper, we mainly study the existence and non-existence of global solutions to degenerate Kirchhoff problem. More precisely, find two invariant sets in which behaviors are different for lower energy case. For high case, applied ω-limit prove that problem admits a blow-up solution. At last, give asymptotic estimates when source term is by differential term.

To resolve the congestion caused by imbalanced traffic at intersections, this paper establishes a model of average delay deviation with minimization in approach as optimization objective. Then, signal control scheme is further optimized based on variable lanes setting. First, we investigate threshold conditions for setting VALs under different flows single direction. The results show that when ratio left-turn exceeds range 0.20~0.28, function needs to be changed from straight left-turn....

An extension of a recent framework for analyzing scheduling disutility with perception errors is derived. In such framework, the traveler has [Formula: see text] preferences. Although actual travel time travelers influenced by departure time, make route-choice decision on basis their perceived time. Thus, we mainly investigate effects optimal The and expected are obtained proposed model errors. inverse function curve standardized normal distribution introduced to geometrically analyze...

Empirical results show that the occurrence of traffic congestion can be reduced by optimizing behavior characteristics drivers. Response time driver plays a major role in driving due to needed drivers sensing velocity and position variations other vehicles. Therefore, we employed desired safety margin model investigate impact time-variant response (TRTD) on flow oscillations. Safety indicators (SM) are used analyze TRTD car-following when an external disturbance is introduced platoon. The...

In China's urban road traffic, aggressive lane change driving behavior is very prevalent. Statistics from traffic accident data show that changing one of the biggest potential dangerous behaviors for safety. This study aimed to analyze impact on vehicle operation by compared normal change. Based actual environment, we built a real acquisition system collect driver operating data, including velocity, acceleration, and lateral acceleration. experimental test, determined "time headway" as...

An extended classical time allocation model with travel reliability constraint is proposed in this study. The valuation function of savings deduced, and the relationship between value other social environment variables, especially waiting service level, revealed. Meanwhile, change level investigated through a comparative static analysis method. Analytical results show that dependent on inverse cumulative distribution function. By contrast, tends to decrease increase time. findings further...

Drivers’ risk perception is vital to driving behavior and traffic safety. In the dynamic interaction of a driver-vehicle-environment system, drivers’ changes dynamically. This study focused on at unsignalized intersections in China analyzed crossing behavior. Based cognitive psychology theory an adaptive neuro-fuzzy inference quantitative models were established for processes between two straight-moving vehicles from orthogonal direction. The acceptable levels drivers identified using...

In this study, the emission and control of flue gas pollutants in CO2 chemical absorption system was studied. It found that condensation nuclei were main factor affected aerosol emissions, reducing number most direct method to pollutant emissions after water washing tower. Higher temperature lean liquid will increase absorbent emission; however, tower could effectively increase. Reducing load also significantly an appropriate reduction combined with a certain intensification indicated...

In this study, the simplified desired safety margin (DSM) model as a car-following strategy is introduced. Based on this, we introduce an uncertainty level of velocity information (ULVI) parameter in DSM model. Three scenarios starting, stopping, and processes are set to investigate impact ULVI rear-end collision V2V communication environment. Results show that negative value can reduce risk during starting process compared with two stopping processes. Furthermore, not conducive reducing...

Driving style plays a key role in influencing stability of traffic heterogeneous flow. This study aims to explore the impact different driving styles on flow basis microscopic car-following model, namely, desired safety margin (DSM) model. The DSM model is used portray psychological behavior, operational and performance driver terms response time. calculated by using five behavior parameters, upper lower limits DSM, sensitivity coefficient acceleration deceleration, Characteristics would...