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Lu L.,Ningbo University | Lu L.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | Ren G.,Nanjing Southeast University | Wang W.,Nanjing Southeast University | And 2 more authors.
Accident Analysis and Prevention | Year: 2016

At unsignalized crosswalks, interactions between pedestrians and vehicles often lead to traffic safety hazards due to absence of traffic control and unclear right-of-ways. To address this safety problem, there is a need to understand the interaction behaviors of pedestrians and vehicles that are complicated by a variety of traffic and roadway attributes. The prime objective of this study is to establish a reliable simulation model to represent the vehicle yielding and pedestrian crossing behaviors at unsignalized crosswalks in a realistic way. The model is calibrated with detailed behavioral data collected and extracted from field observations. The capability of the calibrated model in predicting the pedestrian-interaction events as well as estimating the driver yielding rate and pedestrian delay are also tested and demonstrated. Meanwhile, the traffic dynamics in the vicinity of the crosswalk can be meaningfully represented with simulation results based on the model. Moreover, with the definitions of the vehicle-pedestrian conflicts, the proposed model is capable to evaluate the pedestrian safety. Thereby, the simulation model has the potential to serve as a useful tool for assessing safety performance and traffic operations at existing facilities. Furthermore, the model can enable the evaluation of policy effectiveness and the selection of engineering treatments at unsignalized crosswalks to improve safety and efficiency of pedestrian crossing. © 2016 Elsevier Ltd.


Wu L.,Ningbo University | Jiang G.,Ningbo University | Jiang G.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | Li H.,Ningbo University | Chen L.,Ningbo Road Transport Administration
ICTE 2015 - Proceedings of the 5th International Conference on Transportation Engineering | Year: 2015

In order to further reduce the cost of road freight transport, the influence of the railway freight transport reformation on Ningbo road general freight transport industry are analyzed based on the review of background and core contents of the reformation. As a result, the railway freight reform will bring more cooperation opportunities than competition, which created new opportunities for Ningbo to build a comprehensive land transport system and the development of logistics services. From the standpoint of cooperation-competition development, multimodal transport and the transformation of modern logistics, countermeasures are proposed for the transport of less-than-truckload freight on road. © ASCE.


Song H.,Ningbo University | Song H.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | Ge H.,Ningbo University | Ge H.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | And 4 more authors.
Nonlinear Dynamics | Year: 2016

By introducing optimal velocity car-following model by Bando et al., we present an improved car-following model which is based on an optimal velocity model considering traffic jerk and full velocity difference. The nature of the model is researched by using linear and nonlinear analysis method. The analytical method and numerical simulation results show that the proposed model can describe the phase transition and critical phenomenon with the thermodynamic theory. In order to describe the traffic flow near the critical point, the time-dependent Ginzburg–Landau (TDGL) equation and the modified Korteweg–de Vries (mKdV) equation are derived. Additionally, the connection between the TDGL and the mKdV equation is also given. Theoretical analysis is demonstrated by numerical simulation. © 2016 Springer Science+Business Media Dordrecht


Liu F.,Ningbo University | Liu F.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | Cheng R.,Zhejiang University | Zheng P.,Ningbo University | And 3 more authors.
Nonlinear Dynamics | Year: 2015

A new traffic flow model is proposed based on an optimal velocity car-following model, which takes the traffic jerk effect into consideration. The nature of the model is researched by using linear and nonlinear analysis method. In traffic flow, the phase transition and the critical phenomenon which are described by the thermodynamic theory. The time-dependent Ginzburg-Landau (TDGL) equation and the modified Korteweg-de Veris (mKdV) equation are derived to describe the traffic flow near the critical point. In addition, the connection between the TDGL and the mKdV equations is also given. Numerical simulation is given to demonstrate the theoretical results. © 2015 Springer Science+Business Media Dordrecht


Liu H.,Ningbo University | Liu H.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | Cheng R.,Zhejiang University | Zhu K.,Ningbo University | And 2 more authors.
Nonlinear Dynamics | Year: 2015

Based on the optimal velocity model, a new continuum model considering traffic jerk effect is presented in this paper. Then, the critical condition for the steady traffic flow is deduced. Near the neutral stability line, nonlinear analysis is taken to derive the KdV-Burgers equation for describing the density wave, and one of the solutions is given. Numerical simulation is carried out to study the influence about the traffic jerk effect. © 2015 Springer Science+Business Media Dordrecht


Cui Y.,Ningbo University | Cheng R.-J.,Zhejiang University | Ge H.-X.,Ningbo University | Ge H.-X.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies
Nonlinear Dynamics | Year: 2014

Based on single-lane traffic model, a two-lane traffic model is presented considering the velocity difference control signal. The stability condition of the model is obtained by the control theory. The delayed feedback control signal is added to the two-lane model, and the corresponding stability condition is derived again. The numerical simulations show that as the stability conditions are satisfied, the small disturbance will not amplify with and without control signal. In the meantime, the stability is strengthened as the control signal is considered. So the control signal would suppress the traffic disturbance successfully. © 2014, Springer Science+Business Media Dordrecht.


Fangxun L.,Ningbo University | Fangxun L.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | Rongjun C.,Ningbo University | Rongjun C.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | And 3 more authors.
Nonlinear Dynamics | Year: 2016

In the paper, an improved car-following model based on the full velocity difference model considering the influence of optimal velocity for leading vehicle on a single-lane road is proposed. The linear stability condition of the model is obtained by applying the linear stability theory. Through nonlinear analysis, the time-dependent Ginzburg–Landau (TDGL) equation and the modified Korteweg–de Vries (mKdV) equation are derived to describe the traffic flow near the critical point. In addition, the connection between the TDGL and the mKdV equations is also given. Good agreement between the simulation and the theoretical results shows that the improved model can be enhanced the stability of traffic flow. © 2016 Springer Science+Business Media Dordrecht


Liu B.,Ningbo University | Jiang G.,Ningbo University | Jiang G.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | Chen J.,Ningbo University
ICLEM 2014: System Planning, Supply Chain Management, and Safety - Proceedings of the 2014 International Conference of Logistics Engineering and Management | Year: 2014

In order to improve the trading efficiency in the shipping market of Ningbo, reduce the investment risk and promote the transformation and upgrade of Ningbo port, the container freight index scheme of Ningbo (which is comprised of basic data collection methods, a freight index system and freight index calculation methods) is designed by analyzing the main overseas shipping indices and typical domestic shipping indices. The test results of the actual data indicate that the design scheme not only embodies the price fluctuation for special routes in the container shipping market of Ningbo, but also provides effective information for participants and decision-makers in the shipping market. © 2014 American Society of Civil Engineers.


Li H.,Ningbo University | Jiang G.,Ningbo University | Jiang G.,Ningbo University of Technology | Jiang G.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | Wu L.,Ningbo University
ICTE 2015 - Proceedings of the 5th International Conference on Transportation Engineering | Year: 2015

In order to clarify the relationship between port logistics and economic growth, based on data of port logistics and economic development in Ningbo from 1990 to 2013, the dynamic correlation and causality between Ningbo's port logistics and economic growth has been analyzed via co-integration and Granger test. The empirical results reveal that there is a long-run stationary relation between port logistics and economic growth in Ningbo; and a unidirectional causality between the both, namely, both cargo throughput and container throughput of Ningbo port are Granger causes of economic growth, and container throughput is Granger cause of cargo throughput, not vice versa. According to the experimental results, conclusions and suggestions are put forward from the sustainable level. © ASCE.


Ge H.-X.,Ningbo University | Ge H.-X.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | Zheng P.-J.,Ningbo University | Zheng P.-J.,Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies | And 2 more authors.
Physica A: Statistical Mechanics and its Applications | Year: 2015

Based on optimal velocity car following model, a new model considering traffic jerk is proposed to describe the jamming transition in traffic flow on a highway. Traffic jerk means the sudden braking and acceleration of vehicles, which has a significant impact on traffic movement. The nature of the model is researched by using linear and nonlinear analysis method. A thermodynamic theory is formulated to describe the phase transition and critical phenomenon in traffic flow. The time-dependent Ginzburg-Landau (TDGL) equation and the modified Korteweg-de Vries (mKdV) equation are derived to describe the traffic flow near the critical point and the traffic jam. In addition, the connection between the TDGL and the mKdV equations are also given. © 2015 Published by Elsevier B.V.

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