scholarly journals Research on Platoon Dispersion Delay of Traffic Flow considering Coordinated Control

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Yan Liu ◽  
Kuo Zhang ◽  
Li-jie Wang
Keyword(s):  
Traffic Flow ◽  
Phase Difference ◽  
Unsaturated Flow ◽  
Coordinated Control ◽  
Delay Model ◽  
Traffic Efficiency ◽  
Kinematic Behavior ◽  
Platoon Dispersion ◽  
Time Utilization ◽  
Pass Through

To improve the traffic capacity and reduce the delay of signalized intersections, the delay of coordinated control intersections is studied. Based on the freedom and randomness of the speed change and considering the delay problem caused by the discrete behavior, the authors deduced a new delay model. Firstly, by analyzing the kinematic behavior of traffic flow under coordinated control, it is found that traffic flow reaches the downstream intersection in two different forms. The two forms were as follows: the tail vehicles of discrete traffic flow were truncated and the front vehicles of discrete traffic flow were stopped. Then, the authors deduced the new delay model by analyzing the two conditions. Finally, the delay of the two cases is analyzed, which can be used as the basis for setting the phase difference between coordinated control intersections. The correctness of the model is verified by designing two example coordinated control intersections under unsaturated flow with MATLAB. Results show that the discrete traffic flows will have different impacts on delay or traffic efficiency when they arrive at the downstream intersection in different forms. Through the analysis of the delay of vehicles, when the green split is less than 0.64, the tail truncation delay is greater than the front truncation delay. When the green split is greater than or equal to 0.64, the opposite is true. The phase difference of upstream and downstream intersections can be optimized and coordinated according to the goal that vehicles can smoothly pass through the coordinated control intersection or ensure the minimum delay, so as to give full play to the space-time utilization of the coordinated control intersection.

scholarly journals Bilevel Programming for Traffic Signal Coordinated Control considering Pedestrian Crossing

2020 ◽  
Vol 2020 ◽  
pp. 1-18 ◽  
Author(s):  
Dawei Li ◽  
Yuchen Song ◽  
Qiong Chen
Keyword(s):  
Traffic Flow ◽  
Bilevel Programming ◽  
Motor Vehicle ◽  
Rapid Development ◽  
Coordinated Control ◽  
Traffic Signal ◽  
Motor Vehicles ◽  
Traffic Efficiency ◽  
Pedestrian Delays ◽  
Pedestrian Crossing

With the rapid development of the subway, more and more people choose it as the main method of transportation. However, practically, the large number of pedestrians near some large metro stations can also correspondingly affect the traffic of motor vehicles on the roads adjacent to the stations. In this study, coordinated control of the traffic signal which considers the pedestrian crossing delay is studied based on this background. Firstly, the model of progression band in adjacent intersections is analyzed comprehensively, and the calculation formulas of progression bandwidth and the delay of vehicles which are from the progression of traffic flow under different conditions are given. Secondly, five different models of pedestrian delay are analyzed. Under different conditions of motor vehicle and pedestrian traffic flow, the Vissim fitting and proofreading are carried out and the optimal models under different conditions are obtained. Finally, the bilevel programming problem which fuses the above two models is determined; by coding an algorithm, it can be resolved. Furthermore, taking eight signalized intersections from Jiming Temple to Daxinggong along Nanjing Metro Line 3 as the actual background, the calculation and optimization of coordinated control are carried out. It is found that at the expense of the traffic efficiency of large intersections to a certain extent, a wider progression band can be formulated on the roads between them, and pedestrian delays can be reduced in general.

Study on Coordinated Control of Traffic Signal for Adjacent Intersections

2012 ◽  
Vol 433-440 ◽  
pp. 4765-4770
Author(s):  
Yuan Li Gu ◽  
Chun Fu Shao
Keyword(s):  
Genetic Algorithm ◽  
Mathematical Method ◽  
Traffic Flow ◽  
Coordinated Control ◽  
Traffic Signal ◽  
Urban Road ◽  
Traffic Efficiency ◽  
Phase Offset ◽  
Saturated Traffic ◽  
Key Parameter

Optimization of phase offset for adjacent intersections is the key parameter regarding coordinated control of traffic signal for adjacent intersections, which decides the effect of the coordinated control for adjacent intersections. According to characters of saturated traffic flow of Chinese urban road, this thesis establishes a model for optimization of phase offset for adjacent interactions and finds a solution from such model by adopting genetic algorithm. The model is verified by actual traffic flow datum of two adjacent signal intersections on Changan Avenue. Then a comparison is made between the optimization result of such model and that of the existing mathematical method and SYNCHRO model, which indicates that the model established by this thesis can reduce the delay suffered by vehicles at the intersections and increase the traffic efficiency of the intersections.

Modeling of cooperative adaptive cruise control vehicle and its effect on traffic flow

2021 ◽  
pp. 2250022
Author(s):  
Jianzhong Chen ◽  
Yang Zhou ◽  
Jing Li ◽  
Huan Liang ◽  
Zekai Lv ◽  
...  
Keyword(s):  
Traffic Flow ◽  
Cooperative Control ◽  
Adaptive Cruise Control ◽  
Cruise Control ◽  
Lane Changing ◽  
Vehicle Communication ◽  
Traffic Efficiency ◽  
Vehicle To Vehicle ◽  
Road Capacity ◽  
Cooperative Adaptive Cruise Control

In this paper, an improved multianticipative cooperative adaptive cruise control (CACC) model is proposed based on fully utilizing multivehicle information obtained by vehicle-to-vehicle communication. More flexible, effective and practical spacing strategy is embedded into the model. We design a new lane-changing rule for CACC vehicles on the freeway. The rule considers that CACC vehicles are more inclined to form a platoon for coordinated control. Furthermore, we investigate the effect of CACC vehicles on two-lane traffic flow. The results demonstrate that introducing CACC vehicles into mixed traffic and forming CACC platoon to cooperative control can improve traffic efficiency and enhance road capacity to a certain extent.

Impact Analysis of Different Bus Lane Layout Form to Traffic Efficiency

2014 ◽  
Vol 587-589 ◽  
pp. 2230-2233
Author(s):  
Qian Nan Jiao ◽  
Jian Jun Wang ◽  
Teng Fei Zhang
Keyword(s):  
Comparative Analysis ◽  
Travel Time ◽  
Traffic Flow ◽  
Flow Rate ◽  
Impact Analysis ◽  
Traffic Volume ◽  
Simulation Tool ◽  
Traffic Efficiency ◽  
Micro Simulation ◽  
Bus Lane

This paper use the different layout forms of bus lanes as the study subject, useing the micro-simulation tool VISSIM to comparative analysis different layout forms’ passing traffic volume and travel time in the different traffic volume、traffic flow rate conditions. And offer related suggestions of respective forms’ adaptability.

scholarly journals Manajemen Kecerdasan Spiritual Dalam Menyikapi Paham Radikalisme Di Indonesia

2018 ◽  
Vol 3 (2) ◽  
pp. 109-120
Author(s):  
ARMAN ARMANSYAH FUDIN
Keyword(s):  
Moral Education ◽  
Spiritual Intelligence ◽  
New Order ◽  
Great Awareness ◽  
Spiritual Awareness ◽  
Good Management ◽  
Time Utilization ◽  
The Government ◽  
Pass Through ◽  
Personal Changes

Management is the science of regulating or influencing others to achieve the stated goals. Good management will create a great change in the business carried out, social conditions, and also personal changes. Good management of self will increase the intelligence possessed. One of them is spiritual intelligence. Spiritual intelligence is an effort to direct every action taken to always follow his personal abilities that have transcendent skills, as well as a great awareness to pass through life by using spiritual knowledge to find a way out about life's problems. One of the problems of life that develops in society is the circulation of extreme and negative understandings. One of them is radicalism. Radicalism in Indonesia has developed since the Dutch colonialism, and is increasingly fertile after the fall of the New Order regime. The proliferation of radicalism in Indonesia is influenced by the lack of spiritual awareness possessed. As a result the doctrines are easy to enter, one of them is the doctrine of jihad. Furthermore, radicalism is influenced by globalization and education. The effects of this radicalism cause unrest in the community. For this reason, serious efforts are needed in addressing this radicalism, both from the government, scientists and society in general. Therefore, effective management is needed to address radicalism that is flourishing in the community. One of them is the management of spiritual intelligence. The process of building spiritual intelligence management can be done by providing guidance, such as teaching the Koran, practicing prayer, practicing fasting, practicing Hajj and utilizing the method of the Prophet's preaching, namely exemplary approach, maximizing time utilization, fair attitude, praying kindness, activate the potential for thinking and developing mentally. Furthermore in education by providing moral education, which includes habituation, understanding of which good and bad deeds, assignments in which there is reproof, mental cleansing or the soul of all evil and despicable deeds, as well as the obligation to live morally. Key words: Management, Spiritual Intelligence, Radicalism

scholarly journals Left-Side On-Ramp Metering for Improving Safety and Efficiency in Underground Expressway Systems

2019 ◽  
Vol 11 (12) ◽  
pp. 3247 ◽  
Author(s):  
Minhua Shao ◽  
Congcong Xie ◽  
Lijun Sun ◽  
Xiaomin Wan ◽  
Zhang Chen
Keyword(s):  
Traffic Flow ◽  
Traffic Safety ◽  
Traffic Control ◽  
Flow Characteristics ◽  
Ramp Metering ◽  
Accident Risk ◽  
Data Traffic ◽  
Traffic Efficiency ◽  
Traffic Characteristics ◽  
Two Parameter

As one of the effective measures of intelligent traffic control, on-ramp metering is often used to improve the traffic efficiency of expressways. Existing on-ramp metering research mainly discusses expressways with right-side on-ramps. However, for underground expressway systems (UESs), left-side on-ramps are frequently adopted to reduce the ground space occupied by ramp construction. Since traffic entering from the left and right sides of the mainline may have different traffic characteristics, on-ramp metering for UESs with left-side on-ramps should be explored specifically. This study examines the impacts of left-side on-ramps on the traffic safety and efficiency of UESs and proposes an effective on-ramp metering strategy. Firstly, using field data, traffic flow fundamental diagrams and speed dispersion are discussed to explore the traffic flow characteristics of the “left-in” UES. The results show that the capacity and critical occupancy are both reduced in left-side on-ramp compared to right-side on-ramp expressways. Meanwhile, the speed dispersion is higher in left-side on-ramp UESs, which means a higher accident risk. Based on this, considering traffic safety and efficiency, a novel two-parameter left-side on-ramp metering strategy for UESs is proposed, in which occupancy and speed are used as the control indicators simultaneously. Additionally, the mechanism of the metering strategy is explained. Finally, the proposed on-ramp metering strategy is simulated on a real UES. The results demonstrate the advantages of the proposed two-parameter on-ramp metering strategy for improving the traffic safety and efficiency of UESs.

scholarly journals Analyzing the Influence of Mobile Phone Use of Drivers on Traffic Flow Based on an Improved Cellular Automaton Model

2015 ◽  
Vol 2015 ◽  
pp. 1-9
Author(s):  
Yao Xiao ◽  
Jing Shi
Keyword(s):  
Cellular Automaton ◽  
Traffic Flow ◽  
Flow Rate ◽  
Traffic Safety ◽  
Model Simulation ◽  
Cellular Automaton Model ◽  
Mobile Phone Use ◽  
Traffic Efficiency ◽  
A Value ◽  
Ca Model

This paper aimed to analyze the influence of drivers’ behavior of phone use while driving on traffic flow, including both traffic efficiency and traffic safety. An improved cellular automaton model was proposed to simulate traffic flow with distracted drivers based on the Nagel-Schreckenberg model. The driving characters of drivers using a phone were first discussed and a value representing the probability to use a phone while driving was put into the CA model. Simulation results showed that traffic flow rate was significantly reduced if some drivers used a phone compared to no phone use. The flow rate and velocity decreased as the proportion of drivers using a phone increased. While, under low density, the risk of traffic decreased first and then increased as the distracted drivers increased, the distracted behavior of drivers, like using a phone, could reduce the flow rate by 5 percent according to the simulation.

Analysis and Priority of Slow Traffic Flow at Signalized Intersection

2014 ◽  
Vol 543-547 ◽  
pp. 4169-4172
Author(s):  
Li Yu
Keyword(s):  
Traffic Flow ◽  
Design Flow ◽  
Signalized Intersection ◽  
Signal Timing ◽  
Slow Speed ◽  
Geometric Characteristics ◽  
Traffic Efficiency ◽  
Different Types ◽  
Traffic Conflict ◽  
Fast Start

The slow traffic flow is composed by walking and bike driving. Characteristics of slow traffic flow are fast start and slow speed. The slow traffic and vehicle flow are driving at the same time will cause traffic conflict. The slow traffic priority will be to improve safety and traffic efficiency at the signalized intersection. In this paper, the current problems of slow traffic are analyzed. Combined with the analysis of geometric characteristics of different types of intersection, the principles and implementation conditions of slow traffic priority at the signalized intersection are proposed. From the space priority, the measures of slow traffic priority are proposed at the signalized intersection. From the time priority, slow traffic priority signal timing design flow is proposed.

scholarly journals Car Delay Model near Bus Stops with Mixed Traffic Flow

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Yang Xiaobao ◽  
Huan Mei ◽  
Gao Ziyou
Keyword(s):  
Probability Theory ◽  
Traffic Flow ◽  
Queuing Theory ◽  
Delay Model ◽  
Mixed Traffic ◽  
Average Delay ◽  
Mixed Traffic Flow ◽  
Operation Conditions ◽  
Traffic Stream ◽  
Bus Stops

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 stream and other traffic stream are identified. The first conflict point occurs as bicycles merge to the motorized lane to avoid waiting behind the stopping buses. The second occurs as buses merge back to the motorized lane. The average car delay is estimated as the sum of the average delay at these two conflict points and the delay resulting from following the slower bicycles that merged into the motorized lane. Data are collected to calibrate and validate the developed model from one site in Beijing. The sensitivity of car delay to various operation conditions is examined. The results show that both bus stream and bicycle stream have significant effects on car delay. At bus volumes above 200 vehicles per hour, the curbside stop design is not appropriate because of the long car delays. It can be replaced by the bus bay design.

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