scholarly journals Research on the Equilibrium Speed-Density Relationship Around Flyover Work Zone

2016 ◽  
Vol 28 (3) ◽  
pp. 277-289
Author(s):  
Jin Xin Cao ◽  
Xiao Han Liu
Keyword(s):  
Traffic Flow ◽  
Traffic Safety ◽  
Logistic Model ◽  
Flow Characteristics ◽  
Work Zone ◽  
Work Zones ◽  
Traffic Demand ◽  
Depth Analysis ◽  
Density Relationship ◽  
Traffic Flow Characteristics

Increasing traffic demand has already reached the capacity of existing traffic facilities in most cities. In order to alleviate the traffic pressure and expand the capacity of the road network, constructing flyovers has become an effective way in most cities in China. During the period of the flyover construction, work zones occupy road space, impact traffic flow characteristics and driver behaviour; therefore, this causes a significant reduction of the capacity. Researching of the traffic flow characteristics during the period of flyover construction can improve traffic organization and traffic safety around work zones. This study analyses the traffic flow characteristics around the flyover work zone based on the site data collected in Hohhot City, China. This study shows that the traditional Logistic model for the equilibrium speed-density relationship is not applied to the traffic flow around the flyover work zone. Based on an in-depth analysis of the traffic flow characteristics and specific driver behaviours, this paper proposes an improved Logistic model to depict the equilibrium speed-density relationship around the flyover work zone. To analyse the mathematical characteristics of the speed-density relationship, this paper proposes a method to insert virtual data points into the initial data, which can make the fit curve be continuous.

Review of Methods for Estimating Construction Work Zone Capacity

2021 ◽  
pp. 036119812110022
Author(s):  
Ali H. Mashhadi ◽  
Mohammad Farhadmanesh ◽  
Abbas Rashidi ◽  
Nikola Marković
Keyword(s):  
Traffic Flow ◽  
Traffic Congestion ◽  
Flow Characteristics ◽  
Work Zone ◽  
Future Research ◽  
Construction Work ◽  
Work Zones ◽  
Speed Limits ◽  
Detailed Review ◽  
Traffic Flow Characteristics

Road reconstruction and the resulting work zones are considered as a major source of traffic congestion and delays on freeways. The roadway capacity is decreased as a result of a reduced number of traffic lanes, narrower lanes, and work zone speed limits. Accurate prediction of construction work zone capacity helps traffic engineers to have a better estimation of the traffic flow characteristics. To this end, multiple methodologies have been developed to quantify the impacts of work zones on traffic flow. This paper presents a critical review of the three types of approaches to estimating construction work zone capacities, including parametric, non-parametric, and simulation. Then the most commonly considered factors and their frequency are presented. It also performs a detailed review of the approaches, their objectives, and weaknesses. Lastly, it provides recommendations for future research. The presented work could help researchers in the area of work zone capacity estimation by presenting all the previous methodologies in one place.

scholarly journals Examining the Characteristics of Heterogeneous Traffic at Various Lane Closures

2020 ◽  
Vol 48 (4) ◽  
pp. 384-392
Author(s):  
Jebaselwin Gladson ◽  
Kalaanidhi Sivagnanasundaram ◽  
Karthiga Kasi ◽  
Gunasekaran Karuppanan
Keyword(s):  
Traffic Flow ◽  
Flow Characteristics ◽  
Heterogeneous Traffic ◽  
Work Zone ◽  
Work Zones ◽  
Positioning Systems ◽  
Study Results ◽  
Global Positioning ◽  
Traffic Flow Characteristics ◽  
Selection Of

The primary aim of this study is to support the policy decisions on selection of a work zone layout that would have least deterrence to the traffic flow on busy urban arterials carrying heterogeneous traffic. The traffic flow characteristics were recorded with two cameras and the speed variation was obtained by plying probe vehicles fitted with Global Positioning Systems (GPSs) repeatedly in the section. The traffic stream speed and capacity of the various types of work zone sections were analyzed and it is found that near side lane closure has a relatively least effect on capacity (15 %) whereas the effect of run around type closure is maximum (46 %). The reasons for the variations in speed and capacity at these types of work zones were examined and reported. Besides, the application of the study results with respect to planning of work zone layout is discussed.

Established Methods of Space between Expressway Work Zones Based on Delay of Expressway

2013 ◽  
Vol 409-410 ◽  
pp. 1374-1378 ◽  
Author(s):  
Ke Man Wu ◽  
Lian De Zhong
Keyword(s):  
Traffic Flow ◽  
Traffic Safety ◽  
Flow Simulation ◽  
Work Zone ◽  
Work Zones ◽  
Traffic Capacity ◽  
Traffic Flow Simulation ◽  
Simulation Based ◽  
Traffic Volumes ◽  
Queue Delay

Via microscopic traffic flow simulation, based on the theory of traffic capacity and queue delay of vehicles on work zones and relying on the Reconstruction and Widening of Fekai Expressway, the paper gives suggested values of minimum space between adjacent work zones in the same direction under different traffic volumes and traffic compositions for references, during the construction of a two-way-8-lane highway with half road way closed. The result can promote work zone traffic safety.

Study on Traffic Flow Characteristics and Simulation Based on the VISSIM

2012 ◽  
Vol 203 ◽  
pp. 474-478
Author(s):  
Xin Zhang ◽  
Bao Xin Liu ◽  
De Chun Yuan
Keyword(s):  
Traffic Flow ◽  
Traffic Congestion ◽  
Flow Characteristics ◽  
Beijing City ◽  
Depth Analysis ◽  
Simulation Based ◽  
Simulation Output ◽  
Traffic Flow Characteristics ◽  
Basic Characteristics

As is known to all，Traffic congestion in Beijing city is Increasingly serious.In order to thoroughly analyze the congestion causes of Beijing`s intersection, this paper uses VISSIM to simulate the traffic phenomenon, and in-depth analysis of traffic flow characteristics. Through the simulation of observation, this paper gets the simulation output parameters and basic characteristics of the intersection, and in-depth researches lead to the intersection of the critical causes of congestion, and put forward the corresponding improving countermeasures.

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.

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