Simulation Of Highly Heterogeneous Traffic Flow Characteristics

Author(s):  
V. Thamizh Arasan ◽  
G. Dhivya
Author(s):  
Tanumoy Ghosh ◽  
Sudip Kumar Roy ◽  
Subhamay Gangopadhyay

The behavior of a driver of any vehicle is important in estimating heterogeneous traffic conditions with no strict lane discipline. In the present study, a micro-simulation model is used to analyze the mixed traffic condition with different drivers’ behavior parameters. The field data collected on traffic flow characteristics of multilane highways are used in the calibration and validation of the simulation model. Out of the ten coefficient of correlation (CC) parameters in the simulation model, five are used in the present study to make a model of simulation for heterogeneous traffic; the other five parameters are not considered for testing their influence on simulated capacity values as they represent very typical behavior of a driver, either in car-following, or in free-flow conditions. Two separate simulation models are made by changing the CC (CC0, CC1, CC2, CC7, and CC8) parameters, each for a four-lane divided and a six-lane divided highway as the geometric conditions of the roads and the traffic flow is different for both the cases. These models are then applied on two other sections of a four-lane divided and a six-lane divided highway to validate the parameters of the model developed earlier for other sections.


2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Zijia Zhong ◽  
Joyoung Lee ◽  
Liuhui Zhao

Managed lanes, such as a dedicated lane for connected and automated vehicles (CAVs), can provide not only technological accommodation but also desired market incentives for road users to adopt CAVs in the near future. In this paper, we investigate traffic flow characteristics with two configurations of the managed lane across different market penetration rates and quantify the benefits from the perspectives of lane-level headway distribution, fuel consumption, communication density, and overall network performance. The results highlight the benefits of implementing managed lane strategies for CAVs: (1) A dedicated CAV lane significantly extends the stable region of the speed-flow diagram and yields a greater road capacity. As the result shows, the highest flow rate is 3400 vehicles per hour per lane at 90% market penetration rate with one CAV lane. (2) The concentration of CAVs in one lane results in a narrower headway distribution (with smaller standard deviation) even with partial market penetration. (3) A dedicated CAV lane is also able to eliminate duel-bell-shape distribution that is caused by the heterogeneous traffic flow. (4) A dedicated CAV lane creates a more consistent CAV density, which facilitates communication activity and decreases the probability of packet dropping.


Transport ◽  
2010 ◽  
Vol 25 (2) ◽  
pp. 129-137 ◽  
Author(s):  
Venkatachalam Thamizh Arasan ◽  
Shriniwas Shrikant Arkatkar

The effect of an upgrade and its length is very significant for traffic flow characteristics. Road traffic in developing countries like India is highly heterogeneous comprising vehicles of wide ranging physical dimensions, weight and dynamic characteristics such as engine power, acceleration rate, etc. Due to these variations, the effect of grade on vehicles in heterogeneous traffic may vary significantly among vehicle categories. Variation in the level of the interaction between vehicles on upgrades may result in different sets of traffic flow characteristics. Hence, it is necessary to model traffic flow on upgrades and study, in depth, changes in traffic flow characteristics with alteration in the magnitude of an upgrade and its length. Computer simulation has emerged as an effective technique for modelling traffic flow due to its capability to account for randomness related to traffic. This study is concerned with applying a simulation model of heterogeneous traffic flow, named HETEROSIM, to study the traffic flow characteristics and performance of different vehicle types on upgrades of different magnitudes.


2020 ◽  
Vol 48 (4) ◽  
pp. 384-392
Author(s):  
Jebaselwin Gladson ◽  
Kalaanidhi Sivagnanasundaram ◽  
Karthiga Kasi ◽  
Gunasekaran Karuppanan

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.


Transport ◽  
2011 ◽  
Vol 26 (2) ◽  
pp. 185-196 ◽  
Author(s):  
Nitish Sharma ◽  
Shriniwas Shrikant Arkatkar ◽  
Ashoke Kumar Sarkar

The paper presents traffic studies conducted by using a video capturing technique on the uninterrupted heterogeneous mix of vehicles plying on an undivided two-lane road facility. On the basis of the collected data, traffic characteristics pertaining to arrival, headway and speed distributions have been plotted considering suitable mathematical distributions to fit field observed values. The curves representing fundamental traffic flow relationships among three basic variables, namely speed, density and flow have also been established. Thus, a systematic attempt to enable the understanding of heterogeneous traffic flow parameters has been made through this exploratory study. Santrauka Remiantis vaizdo technika gautais duomenimis, straipsnyje tyrinėjami nenutrūkstami įvairių transporto priemonių srautai dviejų juostų vientisame kelyje. Darbe pateikiamas eismo srauto charakteristikų, susijusių su atvykimu, judėjimu į priekį ir greičio pasiskirstymu, planas, atsižvelgiant į tinkamą matematinį planavimą, sėkmingai derinamą su jau stebėtomis reikšmėmis. Pateiktos fundamentalios transporto eismo srauto grafinės priklausomybės nuo trijų pagrindinių kintamųjų – greičio, tankio ir srauto. Sistemingas tyrimas leidžia geriau suprasti heterogeninio (įvairiarūšio) transporto eismo srauto parametrus. Резюме Исследуется непрерывное движение различных транспортных средств в потоке на двухполосной дороге с использованием данных, полученных с помощью видеотехники. Представлен план характери стик потока движения с учетом прибытия, движения вперед и распределения скорости. Математический эксперимент удачно сочетается с уже имеющимися значениями. Представлены фундаментальные графические зависимости потока движения от трех основных переменных – скорости, плотности и потока. Системное исследование позволит лучше понять параметры гетерогенного потока движения транспорта.


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