The Empirical Study on the Relationships among the Times of Lane-Changing, Speed and Density of Traffic Flow - For Level of Service Two in Different Lanes of Weaving Area of Urban Expressway

2012 ◽  
Vol 209-211 ◽  
pp. 934-937
Author(s):  
Han Xie ◽  
Yang Sheng Jiang ◽  
Juan Xiu Zhu ◽  
Xi Zhao Lu
Keyword(s):  
Empirical Study ◽  
Traffic Flow ◽  
Level Of Service ◽  
Traffic Condition ◽  
Lane Changing ◽  
Urban Expressway ◽  
Statistical Relationships ◽  
The Times

This paper analyzed the statistical relationships among lane-changing, speed and density of traffic flow in different lanes of urban expressway weaving area under a given traffic condition and LOS two. A series of models was recommended. And then, the effectiveness between the recommended model and the existing model was compared. Although the optimization effect not very clear, but it shows that the lane-changing factors have some effects .

Study on Aggression of Lane-Changing on Two-Lane Highway Including a Bus

2013 ◽  
Vol 444-445 ◽  
pp. 743-747
Author(s):  
Yi Yi ◽  
Zhi Peng Li
Keyword(s):  
Traffic Flow ◽  
Current Density ◽  
Traffic Condition ◽  
Lane Changing ◽  
Safety Distance ◽  
The Times ◽  
Real Traffic

In this paper, we focus on the aggression of lane-changing of two-lane highway with a bus in real traffic condition. The fundamental diagrams (current-density) under different safety distance are presented. It is found that the aggression of lane-changing has an influence on the traffic flow and traffic states. We also find the times of lane-changing for different densities and it is clarified that the lane-changing behaviors happen frequently in the middle density.

scholarly journals Exploring Traffic Congestion on Urban Expressways Considering Drivers' Unreasonable Behavior at Merge/Diverge Sections

2018 ◽  
Author(s):  
Kejun Long ◽  
Qin Lin ◽  
Jian Gu ◽  
Wei Wu
Keyword(s):  
Traffic Flow ◽  
Traffic Congestion ◽  
Queue Length ◽  
Transmission Model ◽  
Cell Transmission Model ◽  
Spatiotemporal Evolution ◽  
Lane Changing ◽  
Road Design ◽  
Urban Expressway ◽  
Road Geometry

Mechanism of traffic congestion generation is more than complicated, due to complex geometric road design and complicated driving behavior at urban expressway in China. We employ Cell transmission model (CTM) to simulate traffic flow spatiotemporal evolution process along the expressway, and reveal the characteristics of traffic congestion occurrence and propagation. Here we apply the variable-length-cell CTM to adapt the complicated road geometry and configuration, and propose the merge section CTM considering drivers' mandatory lane-changing and other unreasonable behavior at on-ramp merge section, and propose the diverge section CTM considering queue length end extending expressway mainline to generate dynamic bottleneck at diverge section. In the new improved CTM model, we introduce merge ratio and diverge ratio to describe the effect of driver behavior at merge and diverge section. We conduct simulation on the real urban expressway in China, results show that merge section and diverge section are the original location of expressway traffic congestion generation, on/off-ramp traffic flow has great effect on expressway mainline operation. When on-ramp traffic volume increases by 40%, merge section delay increases by 35%. And when off-ramp capacity increases by 100 veh/hr, diverge section delay decreases about by 10%, which proves the strong interaction between expressway and adjacent road networks . Our results provide the underlying insights of traffic congestion mechanism in urban expressway in China, which can be used to better understand and manage this issue.

scholarly journals Exploring Traffic Congestion on Urban Expressways Considering Drivers’ Unreasonable Behavior at Merge/Diverge Sections in China

2018 ◽  
Vol 10 (12) ◽  
pp. 4359 ◽  
Author(s):  
Kejun Long ◽  
Qin Lin ◽  
Jian Gu ◽  
Wei Wu ◽  
Lee D. Han
Keyword(s):  
Traffic Flow ◽  
Traffic Congestion ◽  
Queue Length ◽  
Transmission Model ◽  
Cell Transmission Model ◽  
Spatiotemporal Evolution ◽  
Lane Changing ◽  
Urban Expressway ◽  
Road Geometry ◽  
A Cell

The mechanisms of traffic congestion generation are more than complicated, due to complex geometric road designs and complicated driving behavior at urban expressways in China. We employ a cell transmission model (CTM) to simulate the traffic flow spatiotemporal evolution process along the expressway, and reveal the characteristics of traffic congestion occurrence and propagation. Here, we apply the variable-length-cell CTM to adapt the complicated road geometry and configuration, and propose the merge section CTM considering drivers’ mandatory lane-changing and other unreasonable behavior at the on-ramp merge section, and propose the diverge section CTM considering queue length end extending the expressway mainline to generate a dynamic bottleneck at the diverge section. In the new improved CTM model, we introduce merge ratio and diverge ratio to describe the effect of driver behavior at the merge and diverge section. We conduct simulations on the real urban expressway in China, with results showing that the merge section and diverge section are the original location of expressway traffic congestion generation, and on/off-ramp traffic flow has a great effect on the expressway mainline operation. When on-ramp traffic volume increases by 40%, the merge section delay increases by 35%, and when off-ramp capacity increases by 100 veh/hr, the diverge section delay decreases about by 10%, which proves the strong interaction between expressway and adjacent road networks. Our results provide the underlying insights of traffic congestion mechanism in urban expressway in China, which can be used to better understand and manage this issue.

scholarly journals Analysis of the Relationship between the Density and Lane-Changing Behavior of Circular Multilane Urban Expressway in Mixed Traffic

2022 ◽  
Vol 2022 ◽  
pp. 1-40
Author(s):  
Han Xie ◽  
Juanxiu Zhu ◽  
Huawei Duan
Keyword(s):  
Linear Relationship ◽  
Traffic Flow ◽  
Autonomous Vehicles ◽  
Heavy Traffic ◽  
Traffic Density ◽  
Flow Density ◽  
Mixed Traffic ◽  
Lane Changing ◽  
Urban Expressway ◽  
The Relationship

The behavior of changing lanes has a great impact on road traffic with heavy traffic. Traffic flow density is one of the important parameters that characterize the characteristics of traffic flow, and it will also be affected by the behavior of changing lanes, especially in the case of each lane. The penetration of autonomous vehicles can effectively reduce lane-changing behavior. Studying the relationship between traffic flow density and lane-changing behavior under different autonomous vehicle penetration rates is of great significance for describing the operation mechanism of mixed traffic flow and the control of mixed traffic. In this article, we use empirical, simulation, and data-driven methods to analyze the urban expressway of autonomous vehicles with penetration rates of 10%, 20%, 30%, 40%, 50%, 60%, 70%, and 80%, respectively. A simulation experiment was carried out on the road, and data related to density, the rate of changing into the lanes, and the rate of changing out lanes were collected. The analysis of the experimental results found the following: (1) The increase in penetration of autonomous vehicles leads to a certain degree of downward trend in density, the rate of changing into the lanes, and the rate of changing out lanes. (2) Different lanes have different effects on the penetration of autonomous vehicles. In a 4-lane road, the two lanes farther from the entrance and exit are closer in appearance, while the two lanes closer to the entrance and exit are similar. (3) The relationship between density and the rate of changing into the lanes and the rate of changing out lanes shows a linear relationship with the penetration of autonomous vehicles. Although the performance of each lane is slightly different, in general, it can be carried out by a multiple regression model. The given parameter value range is relatively close under different permeability. In summary, autonomous vehicles effectively reduce the traffic density and lane-changing behavior of each lane. There is a linear relationship between traffic flow density and lane-changing behavior with the penetration of autonomous vehicles. The density-lane-changing behavior model proposed in this paper can better describe the relationship between the density of the circular multilane urban expressway and the lane-changing behavior in the case of a large traffic flow in mixed traffic.

scholarly journals Empirical Study on Relationship among the Lane-Changing, Speed and Traffic Flow

2011 ◽  
Vol 2 ◽  
pp. 287-294 ◽  
Author(s):  
Han Xie ◽  
Yangsheng Jiang ◽  
Luxi Zhang
Keyword(s):  
Empirical Study ◽  
Traffic Flow ◽  
Lane Changing

CHARACTERISTICS OF FUNDAMENTAL DIAGRAMS DUE TO SHOCKWAVE BY NON-LANE BASED HETEROGENEOUS TRAFFIC

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Abu Jar Md. Minhuz Uddin Ahmed ◽  
Md. Tarek Hasan ◽  
Md. Rakibul Alam ◽  
Md. Shamsul Hoque
Keyword(s):  
Traffic Flow ◽  
Heterogeneous Traffic ◽  
Main Concern ◽  
Traffic Condition ◽  
Lane Changing ◽  
Global Context ◽  
Video Footage ◽  
Flow Parameters ◽  
Significant Decrement ◽  
Lane Based

If the global context of traffic flow researches are highlighted, it is observed that many researches have already been conducted with the Fundamental Diagrams of traffic flow for lane based homogeneous traffic. Studies related to propagation of shockwaves are being conducted as well. But for developing countries such as Bangladesh, it is predominant that non-lane based heterogeneous traffic exists in most of the roads. Firstly there is scarcely any lane concept among the drivers at all. Moreover frequent lane changing is a common phenomenon. For these reasons, responses of Fundamental Diagrams' shape are quite distinctive from already established shapes. Thus the main concern is to trace the deviation of the prevailing traffic flow parameters of traffic flow from those established equations. Video footage has been taken of roadway section marked suitably for measurement. Shockwaves due to lane changing for non-lane based and heterogeneous synchronized traffic flow has been accomplished and modelled using R and MATLAB analysis for a highway of Dhaka city, Bangladesh. After modeling the calibration and validation are done accordingly to distinguish the variation from ideal models and to verify that the study outcomes converge as well. It has been detected that shockwave induces significant decrement in flow and speed in case of specified traffic condition.

ANALYSIS OF THE INFLUENCE OF LANE CHANGING ON TRAFFIC-FLOW DYNAMICS BASED ON THE CELLULAR AUTOMATON MODEL

2011 ◽  
Vol 22 (03) ◽  
pp. 271-281 ◽  
Author(s):  
SHINJI KUKIDA ◽  
JUN TANIMOTO ◽  
AYA HAGISHIMA
Keyword(s):  
Boundary Condition ◽  
Cellular Automaton ◽  
Numerical Simulations ◽  
Traffic Flow ◽  
Flow Dynamics ◽  
Open Boundary ◽  
Open Boundary Condition ◽  
Lane Changing ◽  
Basic Characteristics ◽  
Conventional Models

Many cellular automaton models (CA models) have been applied to analyze traffic flow. When analyzing multilane traffic flow, it is important how we define lane-changing rules. However, conventional models have used simple lane-changing rules that are dependent only on the distance from neighboring vehicles. We propose a new lane-changing rule considering velocity differences with neighboring vehicles; in addition, we embed the rules into a variant of the Nagel–Schreckenberg (NaSch) model, called the S-NFS model, by considering an open boundary condition. Using numerical simulations, we clarify the basic characteristics resulting from different assumptions with respect to lane changing.

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