Isolated Intersection Traffic Signal Timing Problem: A Fuzzy Control Approach and a Case Study

2013 ◽  
Vol 779-780 ◽  
pp. 560-566
Author(s):  
Hui Shi Han ◽  
Jian Yu
Keyword(s):  
Fuzzy Control ◽  
Traffic Flow ◽  
Control Method ◽  
Signal Timing ◽  
Circle Time ◽  
Control Approach ◽  
Right Of Way ◽  
Traffic Signal Timing ◽  
The Right ◽  
Isolated Intersection

Considering the randomness of the traffic flow, a self-adaptive control method for isolated intersection signal timing is proposed, which imitates the traffic polices signal controlling behaviors. Firstly, we define the concepts of Busy Level (for the phase that has got the right of way) and Urgent Level (for the other phases that have not got the right of way). Based on the definitions, the signal control method is put forward, which can be summarized in brief that when Urgent Level is greater than Busy Level, the phase with the highest Urgent Level gains the right of way. Then, based on the fuzzy control theory, we elaborate the fuzzy modeling process of Busy Level and Urgent Level and put forward an optimization method of the membership function using the traversing method. The proposed method is a breakthrough comparing with the old methods that optimize the circle time, the split or the amount of the green time extension. The method has the charactaristics of no fixed circle time, no fixed phase sequence and is more effective to suit the fluctuant traffic flow. At last, the computational results of an simulation demostrates that the proposed method is far more effective than the pretimed signal timing methods.

Genetic Algorithms Based Traffic Signal Optimization at a Congested Intersection

2012 ◽  
Vol 209-211 ◽  
pp. 814-817 ◽  
Author(s):  
Ping Wang ◽  
Qun Yang
Keyword(s):  
Genetic Algorithms ◽  
Objective Function ◽  
Traffic Signal ◽  
Signal Timing ◽  
Signal Optimization ◽  
Average Delay ◽  
Traffic Signal Timing ◽  
Optimal Signal ◽  
Isolated Intersection

The objective of this paper is to investigate genetic algorithms (GA) on traffic signal timing at a congested isolated intersection. The objective function for GA modeling was established on the strategy of minimizing average delay and GA was applied to search for the optimal signal timing. Then microsimulation is used to compare the optimized timings produced by the GA with those obtained for the same intersection using Synchro. Results indicated that applying GA results in lower values of average delay and average number of stops in congested condition than applying Synchro.

Bottleneck Simulation of Two-Lane Traffic CA Model with Turn Signal

2013 ◽  
Vol 404 ◽  
pp. 640-644
Author(s):  
Rui Kang ◽  
Kai Yang
Keyword(s):  
Numerical Simulations ◽  
Traffic Flow ◽  
Traffic Congestion ◽  
Driver Behavior ◽  
Traditional Model ◽  
Right Of Way ◽  
Time Space ◽  
Before And After ◽  
Ca Model ◽  
The Right

Based on the STCA model, an improved two-lane traffic CA model in view of turn signals is proposed. The model considers changes in driver behavior before and after the signaling of the leading vehicle, and introduces rules of changing lanes, cutting lanes and yielding the right of way for the flowing vehicle. Through computer numerical simulations, this study has presented time-space diagrams and also analyzed the effects of driver behavior of the rear vehicles on traffic flow. The results reveal that a higher rate of cutting lanes incurs a heavier traffic flow in normal situations while yielding the right of way relieves traffic congestion in a bottleneck situation. Compared with the traditional model, STCA model can depict more complex traffic situations resulted from different driver behaviors and reproduce a more realistic process of traffic flow.

Crossing Traffic Separation Schemes

1979 ◽  
Vol 32 (3) ◽  
pp. 429-429
Author(s):  
R. S. Richardson
Keyword(s):  
Traffic Flow ◽  
Traffic Density ◽  
Apparent Lack ◽  
General Direction ◽  
Right Of Way ◽  
Cross Traffic ◽  
The Right ◽  
High Traffic Density ◽  
Crossing Vessels ◽  
Do So

The provision of Rule 10 of the 1972 Collision Regulations, that if vessels are obliged to cross traffic lanes they shall do so as nearly as practicable at right angles to the general direction of traffic flow, would appear to be simple enough. Could it be however that in areas of high traffic density, such as the Dover Strait, the theoretical simplicity of the right-angle crossing introduces problems of its own?Crossing the Dover Strait several times a week, I am constantly alarmed by the apparent lack of regard for Rules 15 and 16 by vessels using the traffic scheme (The rules governing crossing situations and action required by the give-way vessel). I accept that some vessels using the lane believe, albeit incorrectly, that they have the right of way, but feel that a large proportion of these ‘port-side charlies’ are the result of the right-angle crossing.Because of the pattern of traffic the speed of crossing vessels in the Strait is generally considerably greater than that of vessels using the lanes. Under the present Regulations a situation frequently arises in which a vessel using the lane finds herself as the give-way vessel to another six points or more on her bow. An initial reluctance to alter course by this amount is followed by the thought that there is not sufficient sea-room in which to alter, and the give-way vessel stands on.

Research on Energy Consumption of Two-Lane Traffic Based on Turn Signal Effect

2013 ◽  
Vol 827 ◽  
pp. 412-416
Author(s):  
Rui Kang ◽  
Kai Yang
Keyword(s):  
Energy Consumption ◽  
Numerical Simulations ◽  
Traffic Flow ◽  
Driver Behavior ◽  
Behavior Changes ◽  
Traditional Model ◽  
Lane Change ◽  
Right Of Way ◽  
Ca Model ◽  
The Right

Based on the STCA model, an improved two-lane traffic CA model considering turn signals is proposed. The model designs driver behavior changes because of the effect of turn light of front vehicle,and introduces rules of changing lanes, cutting lanes and yielding the right of way for the rear vehicle. Through computer numerical simulations, this study has presented curve diagrams of relationship between turning rate and energy consumption and also analyzed the effects of driver behavior of the rear vehicles on traffic flow. The results indicate that increased probability of lane change make more turning rate and energy consumption. When probability of lane change is from 0.5 to 1.0, turning rate increases 13.23% and energy consumption increases 22.15% . Compared with the traditional model, STCA model can depict more complex traffic situations and reproduce driver behaviors and more realistic process of traffic.

Real-Time Traffic Signal Control Based on Kalman Filtering Theory

2015 ◽  
Vol 713-715 ◽  
pp. 915-918
Author(s):  
Yuan Xin Xu ◽  
Wan Ying Yang ◽  
Wen Shi
Keyword(s):  
Kalman Filter ◽  
Traffic Flow ◽  
Control Method ◽  
Urban Traffic ◽  
Traffic Signal Control ◽  
Signal Timing ◽  
Traffic Flows ◽  
Traffic Lights ◽  
Real Time Traffic ◽  
Stable Signal

Aiming at the problem that individual control of urban traffic lights and stable signal timing. This paper proposed a real timing control method of traffic lights which based on Kalman filter. This method use Kalman filter to predict the next time traffic flows and then update the signal timing. By field researching the traffic flow of intersection in peak hour and predicting the traffic flow. Then update the signal timing. Meanwhile using the VISSIM to simulate the intersection. The result of the simulation shows that the length of vehicle queue decreased significantly and the number of stops dropped. The efficiency of access has been greatly improved.

A Fuzzy Control Approach for the Coordinated-Level Control of the Modular-HTGR-Based Nuclear Steam Supplying System

2016 ◽  
Author(s):  
Yue Yuan ◽  
Xiaojin Huang
Keyword(s):  
Fuzzy Control ◽  
Control Method ◽  
Fuzzy Controller ◽  
Fuzzy Model ◽  
Energy System ◽  
Inherent Safety ◽  
Level Control ◽  
Control Approach ◽  
Basic Ideas ◽  
Safety Features

As one of the most popular Generation IV nuclear energy system, High Temperature Gas Cooled Reactor (HTGR) has outstanding inherent safety features. However, the nonlinearity and complexity of the modular-HTGR-based nuclear steam supplying system (NSSS) has put higher requirements to its control system. Based on the basic ideas and theories of fuzzy system, fuzzy control method provides a powerful tool to the control of nonlinear systems. This paper built the T-S fuzzy model of the modular-HTGR-based nuclear steam supplying system (NSSS), and designed the steam temperature T-S fuzzy controller using the parallel distributed compensation (PDC) method. Simulation shows that the designed T-S fuzzy controller has a better effect than the traditional PID control method.

Fuzzy Control of a Resonant Vibration Dryer

2003 ◽  
Author(s):  
V. Sudera ◽  
G. Liu ◽  
S. D. Yu
Keyword(s):  
Dynamical System ◽  
Fuzzy Control ◽  
Control Method ◽  
Experimental Results ◽  
Resonant Vibration ◽  
Resonant Condition ◽  
Control Approach ◽  
Simulation Results ◽  
Varying Mass

This paper presents a fuzzy control method for a resonant vibration grain dryer. The proposed control method identifies and maintains the resonant condition for the dynamical system having constant linear stiffness, varying mass and varying damping. Both simulation results and experimental results show that the amplitude-based fuzzy control approach proposed in this paper are reliable and efficient.

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