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Journal of Intelligent and Connected Vehicles 2021年第1期4卷 16-27页

作者： Suyi Mao Guiming Xiao Jaeyoung Lee Ling Wang Zijin Wang Helai Huang School of Traffic and Transportation Engineering Central South UniversityChangshaChina College of Transportation Engineering Tongji UniversityShanghaiChina Department of Civil Environmental and Construction EngineeringUniversity of Central FloridaOrlandoFloridaUSA

Purpose–This study aims to investigate the safety effects of work zone advisory systems.The traditional system includes a dynamic message sign(DMS),whereas the advanced system includes an in-vehicle work zone warning application under the connected vehicle(CV)environment.Design/methodology/approach–A comparative analysis was conducted based on the microsimulation experiments.Findings–The results indicate that the CV-based warning system outperforms the DMS.From this study,the optimal distances of placing a DMS varies according to different trafﬁc conditions.Nevertheless,negative inﬂuence of excessive distance DMS placed from the work zone would be more obvious when there is heavier trafﬁc volume.Thus,it is recommended that the optimal distance DMS placed from the work zone should be shortened if there is a trafﬁc congestion.It was also revealed that higher market penetration rate of CVs will lead to safer network under good trafﬁc conditions.Research limitations/implications–Because this study used only microsimulation,the results do not reﬂect the real-world drivers’reactions to DMS and CV warning messages.A series of driving simulator experiments need to be conducted to capture the real driving behaviors so as to investigate the unresolved-related issues.Human machine interface needs be used to simulate the process of in-vehicle warning information delivery.The validation of the simulation model was not conducted because of the data limitation.Practical implications–It suggests for the optimal DMS placement for improving the overall efﬁciency and safety under the CV environment.Originality/value–A trafﬁc network evaluation method considering both efﬁciency and safety is proposed by applying trafﬁc simulation.

关键词： Connected vehicles Driver behaviors and assistance Intelligent vehicles Vehicle dynamics and control Vehicle-to-infrastructure communication(V2I) work zone Dynamic message sign(DMS) In-vehicle warning Traffic simulation

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Feasibility of shoulder use for highway work zone optimization

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Journal of Traffic and Transportation Engineering(English Edition) 2014年第4期1卷 235-246页

作者： Bo Du Steven I-Jy Chien Department of Civil and Environmental Engineering New Jersey Institute of Technology School of Automobile Chang'an University

Highway maintenance, often requiring lane closure, is very expensive in terms of the costs associated with transportation agencies （i. e. work zone setups） and road users （i. e. delay）. Longer work zones tend to increase the user delay but will be efficient because of fewer repeated setups. To increase road capacity and mitigate congestion impact for a short-term work zone, temporary shoulder use may be applied. This study develops an analytical model to optimize work zone length on a multi-lane highway considering time-varying traffic volume and road capacity affected by light condition, heavy vehicle percentage, and lane width. The results can be used to evaluate the work zone impact （i. e. delay and cost） and assist engineers/planners to prepare and develop a cost-effective highway maintenance plan. A case study for a highway work zone in New Jersey has been conducted, in which the optimized solution is found. A guideline of using road shoulder under various circumstances is developed.

关键词： work zone lane closure shoulder use highway cost delay optimization

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Assessment of freeway work zone safety with improved cellular automata model

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Journal of Traffic and Transportation Engineering(English Edition) 2014年第4期1卷 261-271页

作者： Guohua Liang Fengjing Wang Wei Wang Xiaoduan Sun Wugong Wang School of Highway Chang'an University Department of Civil Engineering University of Louisiana at LafayetteLafayetteLouisianaUSA

To accurately assess the safety of freeway work zones, this paper investigates the safety of vehicle lane change maneuvers with improved cellular automata model. Taking the traffic conflict and standard deviation of operating speed as the evaluation indexes, the study evaluates the freeway work zone safety. With improved deceleration probability in car-following rules and the addition of lanechanging rules under critical state, the lane-changing behavior under critical state is defined as a conflict count. Through 72 schemes of simulation runs, the possible states of the traffic flow are carefully studied. The results show that under the condition of constant saturation traffic conflict count and vehicle speed standard deviation reach their maximums when the mixed rate of heave vehicles is 40%. Meanwhile, in the case of constant heavy vehicles mix, traffic conflict count and vehicle speed standard deviation reach maximum values when saturation rate is 0.75. Integrating all simulation results, it is known the traffic safety in freeway work zones is classified into four levels： safe, relatively safe, relatively dangerous, and dangerous.

关键词： work zone cellular automata model conflict count safety classification speed standard deviation

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On the impact of connected automated vehicles in freeway work zones:a cooperative cellular automata model based approach

Journal of Intelligent and Connected Vehicles

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Journal of Intelligent and Connected Vehicles 2018年第1期1卷 1-14页

作者： Yun Zou Xiaobo Qu School of Civil and Environmental Engineering Faculty of Engineering and Information TechnologyUniversity of Technology SydneySydneyAustralia Department of Architecture and Civil Engineering Chalmers University of TechnologyGothenburgSweden

Purpose–Freeway work zones have been traffic bottlenecks that lead to a series of problems,including long travel time,high-speed variation,driver’s dissatisfaction and traffic congestion.This research aims to develop a collaborative component of connected and automated vehicles(CAVs)to alleviate negative effects caused by work zones.Design/methodology/approach–The proposed cooperative component is incorporated in a cellular automata model to examine how and to what scale CAVs can help in improving traffic operations.Findings–Simulation results show that,with the proposed component and penetration of CAVs,the average performances(travel time,safety and emission)can all be improved and the stochasticity of performances will be minimized too.Originality/value–To the best of the authors’knowledge,this is the first research that develops a cooperative mechanism of CAVs to improve work zone performance.

关键词： Connected and automated vehicles Cooperative cellular automata model Microscopic traffic flow models work zone

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Optimizing work zones for Two-Lane Urban Road Maintenance Projects

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Tsinghua Science and Technology 2008年第5期13卷 644-650页

作者：黄谦石京 Institute of Transportation Engineering Department of Civil EngineeringTsinghua University

Road maintenance work brings costs to the government and delays to users. The setting up of work zones often leads to severe congestion during peak hours, especially in busy urban areas. A road maintenance delay model is presented here that includes consideration of excessive traffic flow and non-motorists. Atrial-and-error method is used to find the optimal work zone length and the best work starting time to minimize the total cost of maintenance and delays. A numerical example with a sensitivity analysis is also given. The results show that optimal starting time is not sensitive to the flow speed and the increase of work zone speeds sharply reduces the total cost when the road is congested.

关键词： maintenance work zone delay non-motor interference optimizing

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Estimation of Traffic Demand at Freeway work zones

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Journal of Traffic and Transportation Engineering 2021年第1期9卷 26-39页

作者： Eil Kwon Chongmyung Park Department of Civil Engineering University of Minnesota Duluth252 SCIV1405 University Dr.DuluthMN 55812USA Department of Civil Engineering University of Minnesota Duluth207 Eng1303 Ordean Ct.DuluthMN 55812USA

An iterative process,combining a macroscopic simulator and a set of the traffic demand-change estimation models,is developed to estimate the traffic demand at work zones in urban freeway corridors.The process is designed to capture the interaction between work-zone conditions and traffic diversion in determining the traffic demand approaching the entrance and exit ramps at a given work zone.The proposed models and process were calibrated and tested with the field data from the work zones in the Minnesota metro-freeway network.The test results indicate promising possibilities of the proposed process in terms of the estimation accuracy and transferability of the demand-change estimation models developed in this study.

关键词： work zone traffic demand diversion

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