Study on Cooperative Control Method among Large Flow and Long-Distance Intersections

2015 ◽  
Vol 744-746 ◽  
pp. 2006-2011
Author(s):  
Jian Lu ◽  
Jin Gang Gu ◽  
Qiang Fu ◽  
Ya Li
Keyword(s):  
Traffic Flow ◽  
Cooperative Control ◽  
Control Method ◽  
Flow Characteristics ◽  
Signal Control ◽  
Coordination Control ◽  
Long Distance ◽  
Average Delay ◽  
Traffic Flow Characteristics ◽  
Large Flow

Large flow and long distance intersections are very difficult to bring out coordination control and very easy to emerge traffic problems such as traffic congestion due to the large flow and long distance and traffic discrete. It’s necessary to analysis the traffic flow characteristics among large flow and long distance intersections and take measure to improve the signal control. This paper analyzed the traffic flow characteristics of the large flow and long distance intersections, such as the speed would be faster than the normal road between near distance intersection, the headway between cars would be increased, and long traffic queue would be easily occurred at the downstream intersection. In order to realize the coordination control between far intersections, measures for example puts forward signal light at an appropriate position between the intersections, set up fences between vehicles and bicycles, and intersection channelized were put forward to rebuild the traffic flow to adjust the signal control. Those measures were applied to the intersections in Danyang which located in Jiangsu province, the results shows that the queue length was reduced by 67.4% at downstream intersection, the average delay was reduced by 60.3%, the traffic flow saturation was reduced to0.67, and the travel speed and travel time would all become better than before. It suggested that those methods could realize the coordination control and its effect was good, and have good feasibility and practicability.

scholarly journals Dynamic Phase Signal Control Method for Unstable Asymmetric Traffic Flow at Intersections

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Xiancai Jiang ◽  
Yu Jin ◽  
Yanli Ma
Keyword(s):  
Traffic Flow ◽  
Control Method ◽  
Signal Control ◽  
Average Delay ◽  
Lower Efficiency ◽  
Variable Phase ◽  
Dynamic Phase ◽  
Sequencing Studies ◽  
Phase Signal ◽  
Delay Variations

This paper addresses the limitations that the phases proposed in variable phase sequencing studies for stochastic traffic flow are all predetermined and that the variable phase sequencing is only suitable for low traffic volume environment. It presents a dynamic phase signal control method for unstable asymmetric traffic flow with two primary operational objectives: the realization of a dynamic phase scheme in each cycle and optimization of signal control parameters. First, an asymmetric state of traffic flow at signalized intersections is defined, rules governing the generation of the dynamic phase of each cycle based on asymmetric state are proposed, and the delay variations of intersections adopting dynamic phase schemes are modeled. Next, a signal control parameter adjustment algorithm for the dynamic phase is constructed to maximize the positive benefits of delay variation. Last, the operational performance of the proposed method is validated using data collected from an intersection in Harbin, China, by VISSIM simulation. Furthermore, it is found that a higher asymmetric coefficient leads to lower efficiency of a symmetrical release phase scheme at intersections, and the increase of average delay becomes significant when the asymmetric coefficient threshold is greater than 0.2.

scholarly journals Semi-Continuous Spatial Statistical Analysis Using AIS Data for Vessel Traffic Flow Characteristics in Fairway

2021 ◽  
Vol 9 (4) ◽  
pp. 378
Author(s):  
Jong Kwan Kim
Keyword(s):  
Statistical Analysis ◽  
Traffic Flow ◽  
Flow Characteristics ◽  
Automatic Identification ◽  
Identification System ◽  
Spatial Statistical Analysis ◽  
Traffic Characteristics ◽  
Traffic Distribution ◽  
Traffic Flow Characteristics ◽  
Marine Accidents

As high vessel traffic in fairways is likely to cause frequent marine accidents, understanding vessel traffic flow characteristics is necessary to prevent marine accidents in fairways. Therefore, this study conducted semi-continuous spatial statistical analysis tests (the normal distribution test, kurtosis test and skewness test) to understand vessel traffic flow characteristics. First, a vessel traffic survey was conducted in a designated area (Busan North Port) for seven days. The data were collected using an automatic identification system and subsequently converted using semi-continuous processing methods. Thereafter, the converted data were used to conduct three methods of spatial statistical analysis. The analysis results revealed the vessel traffic distribution and its characteristics, such as the degree of use and lateral positioning on the fairway based on the size of the vessel. In addition, the generalization of the results of this study along with that of further studies will aid in deriving the traffic characteristics of vessels on the fairway. Moreover, these characteristics will reduce maritime accidents on the fairway, in addition to establishing the foundation for research on autonomous ships.

Traffic Flow Characteristics on a Three-Lane Rural Highway in Finland: Results from Empirical Studies and Simulations

1997 ◽  
Vol 1572 (1) ◽  
pp. 33-42 ◽  
Author(s):  
Åsa Enberg ◽  
Matti Pursula
Keyword(s):  
Traffic Flow ◽  
Flow Rate ◽  
Empirical Studies ◽  
Flow Characteristics ◽  
Field Studies ◽  
Optimum Length ◽  
Before And After ◽  
Traffic Flow Characteristics ◽  
Simulation Results ◽  
Rural Highway

The traffic-flow characteristics on an experimental, 20-km-long three-lane highway section in Finland were studied. The sections of highway that have a separate passing lane consist of three lanes. The central lane is assigned alternately to each direction as a passing lane with a length of 1.05 to 1.70 km. The lengths of the no-overtaking zones between successive passing lanes are 1.5 to 4.0 km. The traffic-flow characteristics on the three-lane highway have been observed by comprehensive before-and-after field studies and complementary simulations. Because it was possible to use passing lanes, the number of overtakings on the three-lane highway was remarkably higher than on the former two-lane highway. The overall average travel speeds were slightly higher, and the speed decreased a little more slowly with increasing flow on the three-lane compared with the two-lane highway. Overall platooning and mean platoon lengths decreased as a result of platoon dispersal on the passing lanes. The speeds used in the passing lanes were clearly higher than in the basic lanes. According to the simulation results, the optimum length for a single passing lane was between 0.5 and 2.5 km depending on flow rate and measure of effectiveness. For the actual three-lane highway conditions, passing lanes 1.0 to 1.5 km long seemed to bring the most benefits.

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