scholarly journals Signal Control Strategy for Supersaturated Traffic at Urban Road Intersections with a Large Technical Grade Gap

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Baiqun Ding ◽  
Liu Yang ◽  
He Xu ◽  
Yongming He
Keyword(s):  
Control Strategy ◽  
Queue Length ◽  
Control Method ◽  
Signal Control ◽  
Main Road ◽  
Traffic Demand ◽  
The Road ◽  
Capacity Model ◽  
Minor Road ◽  
Remaining Capacity

To reduce the risk of queuing overflow on the urban minor road at the intersection under supersaturation where the capacity of the arterial and minor roads shows extreme disparity, reduce the adverse effects caused by long queues of vehicles on the minor road, and comprehensively balance the multiobjective requirements such as priority of the main road, queuing restrictions, and delay on the minor road, the minor road queue model at the end of red, a road remaining capacity model, and multiparameter coordinated signal control model were established, and a multiobjective genetic algorithm was used to optimize this solution. As an example, the multiparameter coordinated control strategy decreased the delay per vehicle by approximately 17% and the queue length by approximately 30%–50% on the minor road and slightly increased the delay per vehicle at the intersection and the length on the main road queue. This control strategy can make full use of the capacity of the main road to control the queue length on the minor road, effectively reduce the risk of minor road queue overflow blocking local road network traffic operation involved, and comprehensively balance the traffic demand between arterial and minor roads. It provides a reference control method for coping with the transfer of the main traffic contradiction under the oversaturated state of the road intersection with large disparity.

scholarly journals A Novel Left-Turn Signal Control Method for Improving Intersection Capacity in a Connected Vehicle Environment

Electronics ◽  
2019 ◽  
Vol 8 (9) ◽  
pp. 1058 ◽  
Author(s):  
Chuanxiang Ren ◽  
Jinbo Wang ◽  
Lingqiao Qin ◽  
Shen Li ◽  
Yang Cheng
Keyword(s):  
Traffic Safety ◽  
Control Strategy ◽  
Control Method ◽  
Control Model ◽  
Signal Control ◽  
Signal Phase ◽  
Phase Duration ◽  
Left Turn ◽  
Intersection Signal Control ◽  
And Control

Setting up an exclusive left-turn lane and corresponding signal phase for intersection traffic safety and efficiency will decrease the capacity of the intersection when there are less or no left-turn movements. This is especially true during rush hours because of the ineffective use of left-turn lane space and signal phase duration. With the advantages of vehicle-to-infrastructure (V2I) communication, a novel intersection signal control model is proposed which sets up variable lane direction arrow marking and turns the left-turn lane into a controllable shared lane for left-turn and through movements. The new intersection signal control model and its control strategy are presented and simulated using field data. After comparison with two other intersection control models and control strategies, the new model is validated to improve the intersection capacity in rush hours. Besides, variable lane lines and the corresponding control method are designed and combined with the left-turn waiting area to overcome the shortcomings of the proposed intersection signal control model and control strategy.

scholarly journals The Fractional Order PID Method with a Fault Tolerant Module for Road Feeling Control of Steer-by-Wire System

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Fei-xiang Xu ◽  
Xin-hui Liu ◽  
Wei Chen ◽  
Chen Zhou ◽  
Bing-wei Cao
Keyword(s):  
Fractional Order ◽  
Control Strategy ◽  
Control Method ◽  
Fault Tolerant ◽  
Torque Sensor ◽  
The Road ◽  
System A ◽  
Steer By Wire ◽  
Fractional Order Pid ◽  
The Mathematical Model

To improve the road feeling of the steer-by-wire (SBW) system, a fractional order PID (proportion-integral-derivative) method with a fault tolerant module is proposed in this paper. Firstly, the overall road feeling control strategy of the SBW system is introduced, and then the mathematical model of road feeling control is established. Secondly, a fractional order PID (FOPID) controller is designed to control torque of the road feeling motor. Furthermore, genetic algorithm (GA) is applied to tune the FOPID controller’s parameters. Thirdly, a fault tolerant module aiming at potential failures of the motor’s torque sensor is studied to improve the reliability of the system. Kalman Filter (KF) algorithm is utilized in the fault tolerant module so as to detect failures of the motor’s torque sensor, and then fault tolerant module reconfigures the motor’s torque estimated by KF as a substitute when the torque sensor fails. Finally, simulations based on MATLAB are performed with the proposed control strategy to identify its performance, and the results demonstrate that the proposed control method is feasible and accurate.

scholarly journals Design of real-time actuated control system for modern tram at arterial intersections based on logic rules

2018 ◽  
Vol 10 (12) ◽  
pp. 168781401881542
Author(s):  
Yun Li ◽  
Qiyan Cai ◽  
Yujie Xu ◽  
Weihua Shi ◽  
Yibao Chen
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Control Model ◽  
Simulation Software ◽  
Signal Control ◽  
Average Delay ◽  
Absolute Priority ◽  
Control Scheme ◽  
Logic Rule ◽  
Trigger Detector

This article is on the purpose of developing an isolated tram signal priority control strategy based on logic rule for modern tram system. The designed method is presented with features that can ensure the intersection operates in a proper manner on the premise of tram priority and avoid vehicle queue overflow when the tram passes. In this study, the new method description consists of two parts: (1) the detector locations are determined, which include the upstream detector, the upstream trigger detector, the downstream detector, and the queuing detector upon entry approach to the intersection; (2) the corresponding priority logical algorithm for signal control is designed. The proposed method is experimentally examined in a tram intersection in Huaian city, China. In the process of the experiment, the detector layout scheme and optimal priority control model are simulated and verified using the VisVAP module of the Vissim simulation software. In the experimental results, the designed scheme significantly decreases average delay than the fixed timing signal control method, while it also can prevent the vehicle queue from overflowing compared to the absolute priority actuated control scheme.

Research on Control Strategy and Control Plan of Highway Monitor System

2012 ◽  
Vol 229-231 ◽  
pp. 2182-2187
Author(s):  
Jian Chen ◽  
Yu Xin Liu
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Control Process ◽  
Monitor System ◽  
Control Plan ◽  
The Road ◽  
Traffic Incident ◽  
Environment Control ◽  
And Control ◽  
Traffic Operation

At present in China control strategy and control plan of highway monitor system are realized by collecting traffic environmental information, analyzing and processing by computer technology, publishing induction or banned instructions automatically and uniting the overall coordination of the road network traffic operation. In recent years in some provinces monitor plans of the whole distance have been started and monitor strategies of the whole distance have been made completely in order to make highway transportation safer, more open and more comfortable. With the help of the engineering experience and the characteristics of control strategy and control plan of highway monitor system in some provinces and cities ,I study the control strategy and control plan of highway monitor system and in detail analyze four cases that are the traffic flow control plan, the traffic incident control plan, the meteorological environment control plan and the emergency phone alarm control plan by research on the control method, the control process, the facility linkage control and the control result.

A Review into Traffic Signal Improvement at Pedestrian Signalised Crossings

2014 ◽  
Vol 70 (4) ◽  
Author(s):  
Sitti Asmah Hassan ◽  
Othman Che Puan ◽  
Nordiana Mashros ◽  
Nur Sabahiah Abdul Sukor
Keyword(s):  
Control Strategy ◽  
Traffic Signal ◽  
Normal Operation ◽  
Signal Control ◽  
Time Sharing ◽  
Traffic Condition ◽  
The Road ◽  
Detection Strategy ◽  
Road Space ◽  
Signal Improvement

Signalised pedestrian crossings on busy urban street are used to facilitate the time-sharing of road space between vehicles and pedestrians so that pedestrians can cross the road safely. Puffin crossing is the most recent signalised crossings in UK. The operation of Puffin signal control is mainly based on traffic condition hence could impose longer waiting time on pedestrian. Therefore there is a need to review the operation of the signal control strategy of Puffin crossings to make it more pedestrian responsive without imposing significant delay to other road users. This requires the development of a conceptual model of new signal control strategy. Upstream Detection strategy has been identified as one of the potential alternatives that might enhance pedestrian amenity at signalised crossings. In the Upstream Detection strategy, detection is located at an upstream location of the crossing, so that the pedestrian demand can be registered earlier rather than waiting at the kerbside. Therefore, pedestrian does not need to arrive at the kerbside to activate the demand as in the normal operation of Puffin crossings. By doing so, pedestrian delay can be minimised. Therefore, this paper is intended to provide some insight into traffic signal improvement at pedestrian crossings, so that, it will be more pedestrian friendly without imposing significant interruption to vehicles. This paper seeks to explore the development of Upstream Detection strategy at Puffin crossings and its potential benefits. At this stage, Upstream Detection strategy has not yet been evaluated to explain specific findings of the strategy.

Left-Turn Spillback Probability Estimation in a Connected Vehicle Environment

2019 ◽  
Vol 2673 (4) ◽  
pp. 753-761
Author(s):  
Xiaowei Cao ◽  
Jian Jiao ◽  
Yunlong Zhang ◽  
Xiubin Wang
Keyword(s):  
Control Strategy ◽  
Queue Length ◽  
Estimation Method ◽  
Signal Control ◽  
Connected Vehicles ◽  
Connected Vehicle ◽  
Model Accuracy ◽  
Left Turn ◽  
Microscopic Traffic Simulation ◽  
Length Estimation

At intersections in which the left-turn bay does not have sufficient length or the left-turn volume is relatively high, left-turn vehicles may spill back and block the adjacent through traffic. This paper aims to develop quantitative measures of the left-turn spillback, and by using the results on spillback probability, develop a suitable signal control strategy. We first develop an improved queue length estimation method for vehicles in the left-turn bay based on Comert and Cetin’s general queue length estimation method with connected vehicles, after which we propose a probabilistic model to measure the left-turn spillback probability at an intersection in a connected environment. The model accuracy is validated with results from microscopic traffic simulation. The effect of bay length is also studied. In the end, a signal control demonstration is presented to show the efficiency of the proposed method in signal control.

scholarly journals Subdivision of Urban Traffic Area Based on the Combination of Static Zoning and Dynamic Zoning

2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Jing Luo ◽  
Qingnian Zhang
Keyword(s):  
Decision Making ◽  
Traffic Flow ◽  
Control Strategy ◽  
Road Network ◽  
Model Verification ◽  
Signal Control ◽  
The Road ◽  
Traffic Area ◽  
Center Point ◽  
Clustering Center

In this paper, the traffic area of subzone division in urban road network is studied and a subzone division method based on the combination of static partition and dynamic partition is proposed. The static partition is carried out for the road network when the traffic flow is in a noncongested state, so as to provide the decision-making basis for the traffic green wave signal control strategy. At the same time, aiming at the road network when the traffic flow is congested, the dynamic partition is carried out on the basis of static partition to provide the decision-making basis for the traffic maximum flow signal control strategy. In view of the fact that it is difficult to determine the clustering center point during the initial division, this method proposes to determine the clustering center point according to the value of nodes of betweenness centrality. In order to solve the problem that it is difficult to collect traffic data, a method for estimating traffic flow density is proposed. In order to solve the problem of normalization of different probability distribution among various parameters, Mahalanobis distance is used as the fusion index of subzone division. Model verification shows that the method is feasible and effective.

scholarly journals Improved Road-Network-Flow Control Strategy Based on Macroscopic Fundamental Diagrams and Queuing Length in Connected-Vehicle Network

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaohui Lin ◽  
Jianmin Xu ◽  
Peiqun Lin ◽  
Chengtao Cao ◽  
Jiahui Liu
Keyword(s):  
Real Time ◽  
Boundary Control ◽  
Control Strategy ◽  
Road Network ◽  
Traffic Signal ◽  
Signal Control ◽  
Traffic Signal Control ◽  
Connected Vehicles ◽  
Boundary Flow ◽  
The Road

Connected-vehicles network provides opportunities and conditions for improving traffic signal control, and macroscopic fundamental diagrams (MFD) can control the road network at the macrolevel effectively. This paper integrated proposed real-time access to the number of mobile vehicles and the maximum road queuing length in the Connected-vehicles network. Moreover, when implementing a simple control strategy to limit the boundary flow of a road network based on MFD, we determined whether the maximum queuing length of each boundary section exceeds the road-safety queuing length in real-time calculations and timely adjusted the road-network influx rate to avoid the overflow phenomenon in the boundary section. We established a road-network microtraffic simulation model in VISSIM software taking a district as the experimental area, determined MFD of the region based on the number of mobile vehicles, and weighted traffic volume of the road network. When the road network was tending to saturate, we implemented a simple control strategy and our algorithm limits the boundary flow. Finally, we compared the traffic signal control indicators with three strategies: (1) no control strategy, (2) boundary control, and (3) boundary control with limiting queue strategy. The results show that our proposed algorithm is better than the other two.

Study on Traffic Signal Control for Single Intersection via Fuzzy Logic

2012 ◽  
Vol 263-266 ◽  
pp. 624-628 ◽  
Author(s):  
Fu Yang Chen ◽  
Zhi Chao Chen ◽  
Feng Jiang
Keyword(s):  
Waiting Time ◽  
Control Method ◽  
Fuzzy Controller ◽  
Road Transport ◽  
Traffic Signal ◽  
Signal Control ◽  
Traffic Signal Control ◽  
Traffic Condition ◽  
Traffic Demand ◽  
Average Waiting Time

Considering the status of the modern road transport system, traffic signal control for isolated intersection is studied in this paper. A traffic signal control method for six-phase intersection is proposed in this paper, aiming at reducing the average waiting time of vehicles. A two-stage fuzzy controller for this method is designed in the paper. This method takes into account not only the traffic condition of the current prevailing phase and the next phase, but also the traffic demand of the vehicle flow that turn right, non-motorized traffic flow and pedestrian. Taking the average waiting time of vehicles as the evaluation index, we make simulations on the control method proposed above. The result for the simulation shows that the performance of this method is superior to that of the timing signal control method.

scholarly journals Research on Intersection Frequent Overflow Control Strategy Based on Wide-Area Radar Data

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Li-li Zhang ◽  
Qi Zhao ◽  
Li Wang
Keyword(s):  
Cross Section ◽  
Control Strategy ◽  
Radar Data ◽  
Wide Area ◽  
Data Types ◽  
Traffic Demand ◽  
The Road ◽  
Vehicle To Infrastructure ◽  
Overflow Control ◽  
And Control

Overflow identification and control at urban road intersection is a derivative problem of oversaturation control. The existing cross-section detector uses the road cross-section occupation of vehicles to identify the overflow state; then, the downstream road condition is often ignored. At present, more and more advanced traffic detection technologies, such as vehicle-to-infrastructure and wide-area radar, can provide reliable data for accurate overflow identification. In this paper, a new method of overflow identification and control at intersections is proposed by using advanced wide-area radar detection data. As a detector for specific segment of road, the wide-area radar can detect the traffic flow data in a certain range of road and provide more data types. Therefore, the average speed and space occupancy of the effective detection road segment are selected as subindicators to establish the comprehensive identification index of overflow identification. Then, the overflow control strategy is developed considering the traffic demand of the overflow phase and the nonoverflow phase. It is proved that the method is more accurate and effective in overflow identification and control by using simulation experiment of field data.

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