scholarly journals Impact of Penetrations of Connected and Automated Vehicles on Lane Utilization Ratio

2022 ◽  
Vol 14 (1) ◽  
pp. 474
Author(s):  
Xiaoyuan Wang ◽  
Shijie Liu ◽  
Huili Shi ◽  
Hui Xiang ◽  
Yang Zhang ◽  
...  
Keyword(s):  
Traffic Management ◽  
Traffic Volume ◽  
Automated Vehicles ◽  
Lane Changing ◽  
Microscopic Traffic Simulation ◽  
Field Coupling ◽  
Utilization Ratio ◽  
Changing Times ◽  
Lane Utilization ◽  
And Control

Lane Utilization Ratio (LUR), affected by lane selection behavior directly, represents the traffic distribution on different lanes of road section for a single direction. The research on LUR, especially under Penetration Conditions of Connected and Automated Vehicles (PCCAV), is not comprehensive enough. Considering the difficulty in the conduction of real vehicle experiment and data collection under PPCAV, the lane selection model based on phase-field coupling and set pair logic, which considers the full-information of lanes, was used to carry out microscopic traffic simulation. From the analysis of microsimulation results, the basic relationships between Penetration of Connected and Automated Vehicles (PCAV), traffic volume, and Lane-Changing Times, also that between PCAV, traffic volume, and LUR in the basic section of the urban expressway were studied. Moreover, the influence of driving propensity on the effect of PCAVs was also studied. The research results could enrich the traffic flow theory and provide the theoretical basis for traffic management and control.

scholarly journals Some traffic characteristics of rural roads in Iraq

2018 ◽  
Vol 162 ◽  
pp. 01030
Author(s):  
Hamid Athab Al-Jameel ◽  
Ali Jihad Kadhim
Keyword(s):  
Structural Design ◽  
Traffic Management ◽  
Field Data ◽  
Driver Behaviour ◽  
Rural Roads ◽  
Lane Changing ◽  
Normal Section ◽  
Lane Changes ◽  
Traffic Characteristics ◽  
Lane Utilization

Now a days, modeling traffic characteristics are very important in evaluating traffic facilitates such normal section, weaving and merging sections. Lane changing and lane utilization are important traffic characteristics that are widely studied. Therefore this study is focused on both of these. The lane changing behavior affects the capacity and safety of roads. The distribution of vehicles among lanes of roadway is important in terms of different aspects such as safety, traffic management and even the structural design of roads. Field data have been collected from different rural roads. Two types of roads were studied; two-lane section and three-lane section. The results of analysis for collected data indicate that the driver behaviour is different in terms of lane utilization in Iraq from other countries and the same behaviour was found for lane changes also. Compared to other countries, Iraq has the lowest lane utilization and highest frequency of lane changes. These data are urgently needed nowadays for calibrating and validating the sophisticated programs such as simulated microscopic programs. These data are so important to mimic the reality for driver behaviors in rural roadways.

scholarly journals Effects of Connected and Automated Vehicles in a Cooperative Environment

2020 ◽  
pp. 21-28
Author(s):  
Ondrej Pribyl
Keyword(s):  
Co2 Emissions ◽  
Traffic Control ◽  
Traffic Management ◽  
Automated Vehicles ◽  
Impact Indicator ◽  
Microscopic Traffic Simulation ◽  
Flow Parameters ◽  
Traffic Performance ◽  
Environmental Goals ◽  
The Impact

Cooperative and automated vehicles (CAVs) are often considered a mean to improve quality of life in cities, the traffic flow parameters in particular. This paper provides some evidence based on microscopic traffic simulation on how the effects can really be. Important is that the particular use cases are not built in vehicles only. We focus on so called cooperative environment and advanced traffic control measures.This paper describes the impact of CAVs on a cooperative urban environment, resulting from a European research project - MAVEN. We clearly demonstrate that a proper integration of CAVs into city traffic management can, for example, help with respect to the environmental goals and reduce CO2 emissions by up to 12 % (a combination of GLOSA and signal optimization). On corridors with a green wave, a capacity increase of up to 34% was achieved. Already for lower penetra- tion rates (20% penetration of CAVs), there are significant improvements in traffic performance. For example, platooning leads to a decrease of CO2 emissions of 2,6 % or an impact indicator by 17,7%.

Risk Evaluation for Conflicts between Crossing Pedestrians and Right-Turning Vehicles at Intersections

2021 ◽  
pp. 036119812110318
Author(s):  
Feifei Xin ◽  
Xiaobo Wang ◽  
Chongjing Sun
Keyword(s):  
Traffic Management ◽  
Traffic Signals ◽  
Control Measures ◽  
Video Information ◽  
Fuzzy Clustering Method ◽  
Different Types ◽  
Micro Level ◽  
Conflict Risk ◽  
And Control ◽  
Deceleration Time

In recent years, conflicts between crossing pedestrians and right-turning vehicles have become more severe at intersections in China, where right-turning vehicles are usually not controlled by traffic signals. This study proposes a quantitative method for evaluating the conflict risk between pedestrians and right-turning vehicles at intersections based on micro-level behavioral data obtained from video detection. A typical intersection in Shanghai was selected as the study site. In total, 670 min of video were recorded during the peak hours from 7:30 a.m. to 9:30 p.m on one day. After processing the video information, vehicle and pedestrian tracking data were obtained, including the velocity, acceleration, deceleration, time, and location coordinates. Based on these data, several conflict indicators were proposed and these indicators were extracted automatically using MATLAB to identify pedestrian–right-turning vehicle conflicts and to determine the severity of the conflicts identified. This process identified 93 examples of such conflicts. The conflict risks were quantitatively classified using the K-means fuzzy clustering method and all of the conflicts were assigned to five grades. The characteristics of the conflict distribution and the severity of different types of conflict were also analyzed, which showed that conflicts on different areas on the crosswalk differed in their severity. Based on the conclusions, practical traffic management and control measures are proposed to reduce the risk on pedestrian crossings.

scholarly journals Extracting Road Traffic Volume in the City before and during covid-19 through Video Remote Sensing

2021 ◽  
Vol 13 (12) ◽  
pp. 2329
Author(s):  
Elżbieta Macioszek ◽  
Agata Kurek
Keyword(s):  
Travel Behavior ◽  
Traffic Management ◽  
Road Traffic ◽  
Traffic Volume ◽  
The Road ◽  
Traffic Characteristics ◽  
Annual Average Daily Traffic ◽  
On The Road ◽  
The Impact ◽  
The City

Continuous, automatic measurements of road traffic volume allow the obtaining of information on daily, weekly or seasonal fluctuations in road traffic volume. They are the basis for calculating the annual average daily traffic volume, obtaining information about the relevant traffic volume, or calculating indicators for converting traffic volume from short-term measurements to average daily traffic volume. The covid-19 pandemic has contributed to extensive social and economic anomalies worldwide. In addition to the health consequences, the impact on travel behavior on the transport network was also sudden, extensive, and unpredictable. Changes in the transport behavior resulted in different values of traffic volume on the road and street network than before. The article presents road traffic volume analysis in the city before and during the restrictions related to covid-19. Selected traffic characteristics were compared for 2019 and 2020. This analysis made it possible to characterize the daily, weekly and annual variability of traffic volume in 2019 and 2020. Moreover, the article attempts to estimate daily traffic patterns at particular stages of the pandemic. These types of patterns were also constructed for the weeks in 2019 corresponding to these stages of the pandemic. Daily traffic volume distributions in 2020 were compared with the corresponding ones in 2019. The obtained results may be useful in terms of planning operational and strategic activities in the field of traffic management in the city and management in subsequent stages of a pandemic or subsequent pandemics.

Freeway Traffic Management and Control

2009 ◽  
pp. 3943-3964 ◽  
Author(s):  
A. Hegyi ◽  
T. Bellemans ◽  
B. De Schutter
Keyword(s):  
Traffic Management ◽  
Freeway Traffic ◽  
And Control

scholarly journals The First Main Line in Russia

2021 ◽  
Vol 19 (2) ◽  
pp. 124-136
Author(s):  
D. Yu. Levin
Keyword(s):  
Traffic Management ◽  
Main Type ◽  
Extreme Points ◽  
Main Line ◽  
Railway Transport ◽  
The World ◽  
Points Of View ◽  
Private Entrepreneurs ◽  
And Control ◽  
Rich History

The article is dedicated to the 170th anniversary of the first Russian railway main line St. Petersburg–Moscow. The country’s railway transport, as the main type of transportation, has a rich history and remarkable patriotic, labour, scientific, and technical traditions. We must remember them. The emergence of railways in Russia, as in other countries of the world, was accompanied by many problems that needed to be solved: financing methods, types of ownership, track gauge, types of traction and signalling, traffic management and control, competition with other modes of transport, etc. The stage of emergence of railways in Russia is very instructive. What extreme points of view were expressed, and how long did it take to start building main lines? After the society realised the need for construction of railways, it became obvious that the costs required are not affordable neither for the state, nor for creditors, nor for private entrepreneurs. To better understand how construction of the first railway in Russia was conducted, the article offers many illustrations. 

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