scholarly journals DETERMINATION OF TRAFFIC FLOW PARAMETERS IN DIFFERENT TRAFFIC FLOW INTERACTION CASES

Transport ◽  
2007 ◽  
Vol 22 (3) ◽  
pp. 236-239 ◽  
Author(s):  
Raimundas Junevičius ◽  
Marijonas Bogdevičius
Keyword(s):  
Mathematical Model ◽  
Kinetic Theory ◽  
Traffic Flow ◽  
Flow System ◽  
Flow Speed ◽  
Characteristic Method ◽  
Flow Parameters ◽  
Road Section ◽  
Unbroken Line

Modelling of straight road section consisting of one traffic line gives the opportunity to simulate “follow the car” system. In general it looks like a line of vehicles, going one after another. Kinetic theory, used in this paper describes traffic flow system as a straight unbroken line with limited flow speed and concentration. Such model also gives the opportunity to derive traffic lines intersections. For example, intersection could be derived like a point with traffic lines coming and outgoing from this point by only changing boundary conditions. Mathematical model is built using characteristic method.

scholarly journals DETERMINATION OF THE DELAY TIME OF THE BUS DEPARTURE FROM THE STOP POINT LOCATED NEAR A REGULATED CROSSROADS

2020 ◽  
Vol 3 (156) ◽  
pp. 35-40
Author(s):  
P. Gorbachov ◽  
O. Makarichev ◽  
O. Kolii ◽  
Y. Liubyi
Keyword(s):  
Traffic Flow ◽  
Delay Time ◽  
Regression Models ◽  
Basic Research ◽  
Transport Systems ◽  
Passenger Transportation ◽  
Flow Parameters ◽  
Object Of Study ◽  
Stop Point

The article is devoted to solving scientific and applied problems of determining the rational location of stopping points at the entrance or exit from controlled intersections. Analysis of approaches and methods to the determination of rational location of stopping points showed that they are mostly based on the goals of minimizing the time for passenger transportation or maximizing the performance of transport systems functioning. With that, the question of determining the time of delay of vehicle departure from the stopping point bottleneck after the embarkation and disembarkation of passengers is paid very little attention to. Currently, there are only regression models available that cannot claim to be universal and their use in transport planning requires similar conditions of functioning with the object, where statistic data were collected. The conducted analysis allowed determining the trend of basic research, namely, assessment of the influence of traffic flow parameters on the delay time of route transport departure from the stopping point bottleneck in the area adjacent to the controlled intersection. The process of delay occurrence at the exit of route transport from the stopping point bottleneck was formalized as the object of study thanks to which there was built an analytical model to determine the time of delay of route transport departure from the stopping point bottleneck. There were investigated two options for placement of a stopping point at the entrance and exit from the intersection. According to the results of calculations, it was determined that the delay time of route transport departure from the stopping point was influenced by many factors, whose influence varies depending on the location of the stopping point at the entrance and exit from a controlled intersection. By the results of researches one can be affirm that the most expedient is the placement of a stopping point at the minimum acceptable distance from the intersection, and it is recommended to locate a stopping point at a distance of 30 m at the entrance to the intersection. Keywords: stop, route vehicles, traffic flow, regulated intersections, traffic, latency, capacity transport areas.

scholarly journals Comparison of Traffic Flow Models with Real Traffic Data Based on a Quantitative Assessment

2021 ◽  
Vol 11 (21) ◽  
pp. 9914
Author(s):  
Aleksandra Romanowska ◽  
Kazimierz Jamroz
Keyword(s):  
Traffic Flow ◽  
Deterministic Model ◽  
Empirical Relationship ◽  
Flow Speed ◽  
Traffic Data ◽  
Flow Models ◽  
Flow Parameters ◽  
Fundamental Relationship ◽  
Traffic Flow Models ◽  
Real Traffic

The fundamental relationship of traffic flow and bivariate relations between speed and flow, speed and density, and flow and density are of great importance in transportation engineering. Fundamental relationship models may be applied to assess and forecast traffic conditions at uninterrupted traffic flow facilities. The objective of the article was to analyze and compare existing models of the fundamental relationship. To that end, we proposed a universal and quantitative method for assessing models of the fundamental relationship based on real traffic data from a Polish expressway. The proposed methodology seeks to address the problem of finding the best deterministic model to describe the empirical relationship between fundamental traffic flow parameters: average speed, flow, and density based on simple and transparent criteria. Both single and multi-regime models were considered: a total of 17 models. For the given data, the results helped to identify the best performing models that meet the boundary conditions and ensure simplicity, empirical accuracy, and good estimation of traffic flow parameters.

Research on Relationships among Three Parameters in Short-Term Traffic Flow Forecasting

2011 ◽  
Vol 130-134 ◽  
pp. 2072-2076
Author(s):  
Xin Ping Xiao ◽  
Yi Chen Hu ◽  
Huan Guo
Keyword(s):  
Traffic Flow ◽  
Statistical Correlation ◽  
Flow Speed ◽  
Short Term ◽  
Flow Parameters ◽  
Speed Flow ◽  
Basic Parameters ◽  
Binary Linear Regression ◽  
Time Changes ◽  
Grey Relational

This paper expects to get the real-time changes of traffic flow by researching the relationships among the three basic parameters flow, speed and occupancy. we firstly carries out the statistical correlation analysis and grey relational analysis to study the connection between the traffic flow parameters flow and speed, flow and occupancy to get a conclusion that there doesn’t exist a significant linear relationship between neither of the comparisons, and the influence of speed on the flow is a little bigger than that of occupancy. Then we try to establish the binary linear regression model without the intercept and GM (0,3) model to do the data fitting, the final simulation results illustrate that the two methods has effects in some extent, also explain the complexity of traffic flow.

scholarly journals An Analytical Framework for Accurate Traffic Flow Parameter Calculation from UAV Aerial Videos

2020 ◽  
Vol 12 (22) ◽  
pp. 3844
Author(s):  
Ivan Brkić ◽  
Mario Miler ◽  
Marko Ševrović ◽  
Damir Medak
Keyword(s):  
Traffic Flow ◽  
Low Cost ◽  
Vehicle Detection ◽  
Analytical Framework ◽  
Satellite System ◽  
Percentage Error ◽  
Vehicle Speed ◽  
Dual Frequency ◽  
Flow Parameters

Unmanned Aerial Vehicles (UAVs) represent easy, affordable, and simple solutions for many tasks, including the collection of traffic data. The main aim of this study is to propose a new, low-cost framework for the determination of highly accurate traffic flow parameters. The proposed framework consists of four segments: terrain survey, image processing, vehicle detection, and collection of traffic flow parameters. The testing phase of the framework was done on the Zagreb bypass motorway. A significant part of this study is the integration of the state-of-the-art pre-trained Faster Region-based Convolutional Neural Network (Faster R-CNN) for vehicle detection. Moreover, the study includes detailed explanations about vehicle speed estimation based on the calculation of the Mean Absolute Percentage Error (MAPE). Faster R-CNN was pre-trained on Common Objects in COntext (COCO) images dataset, fine-tuned on 160 images, and tested on 40 images. A dual-frequency Global Navigation Satellite System (GNSS) receiver was used for the determination of spatial resolution. This approach to data collection enables extraction of trajectories for an individual vehicle, which consequently provides a method for microscopic traffic flow parameters in detail analysis. As an example, the trajectories of two vehicles were extracted and the comparison of the driver’s behavior was given by speed—time, speed—space, and space—time diagrams.

scholarly journals MODELLING OF INTERNAL COMBUSTION ENGINES’ EMISSION THROUGH THE USE OF TRAFFIC FLOW MATHEMATICAL MODELS

Transport ◽  
2011 ◽  
Vol 26 (3) ◽  
pp. 271-278 ◽  
Author(s):  
Raimundas Junevičius ◽  
Marijonas Bogdevičius ◽  
Ádám Török
Keyword(s):  
Mathematical Model ◽  
Traffic Flow ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Flow Speed ◽  
Model Description ◽  
Regression Equations ◽  
Combustion Engines ◽  
Traffic Flows ◽  
The Mathematical Model

Road traffic flows on a straight road segment are modelled in this article. The mathematical model of traffic flows has been constructed by using the method of lumped parameters. CO2, CO, CH, NOx, PM regression equations of internal combustion engines’ (ICE) emission has been developed. The accuracy of regression equations is 0.98÷0.99. The article presents assumptions for constructing the mathematical model, description of the mathematical model and gives simulation results. Traffic flow parameters, such as traffic flow concentration and traffic flow speed are presented as modelling results. ICE emission depending on the concentration and traffic flow speed are presented as well.

scholarly journals The impact of the average traffic flow speed on occurrence risk of road crash

2019 ◽  
Vol 65 (2) ◽  
pp. 29-36
Author(s):  
Dalibor Pešić ◽  
Boris Antić ◽  
Emir Smailovic ◽  
Bojana Todosijević
Keyword(s):  
Traffic Flow ◽  
Flow Characteristics ◽  
Flow Speed ◽  
Flow Density ◽  
Average Speed ◽  
Flow Parameters ◽  
Flow Speeds ◽  
Road Crash ◽  
The Subject ◽  
The Impact

Traffic flow characteristics have a significant impact on occurrence risk of road crash. The most important characteristics of the traffic flow, the impact of which is the subject of numerous studies, are the traffc flow, density, average traffic flow speed, dispersion of traffic flow speeds, as well as the contents of vehicle in traffic flow. These characteristics are in strong correlation between each other, so changes in one parameter conditional make change of other parameters. Research shows that speed-related traffic flow parameters have a significant impact on occurrence risk of road crash. Therefore, in this study an analysis of the impact of the change in the average speed of the traffic flow on the risk of an accident occurred. The research includes a section of the single carriageway from Preljina to Ljig. After the construction of the highway in the stated section of the signle carriageway, a change in the characteristics of the traffic flow occurred, with this study examining the impact of changing the average speed of the traffic flow to the occurrence risk of road crash. The connection between the speed of traffic flow and the risk of accidents has been confirmed in this study, so with the increase in average speed the risk of accidents increases.

scholarly journals COMPARATIVE ANALYSIS OF METHODS FOR DETERMINATION OF SUPPLY FLOWS

2021 ◽  
pp. 64-78
Author(s):  
Nataliia Semchenko ◽  
Olha Kholodova ◽  
Maryna Buhaiova
Keyword(s):  
Comparative Analysis ◽  
Traffic Flow ◽  
Analytical Calculation ◽  
Signalized Intersections ◽  
Highway Capacity ◽  
Highway Capacity Manual ◽  
Flow Parameters ◽  
Definition Of ◽  
Saturation Flow

Problem. The capacity of signalized intersections is determined using the concept of "saturation flow". It is the main characteristic in the process of their analysis, design and calculation. The work is devoted to solving the scientific-applied problem of increasing the efficiency of the signalized intersection at one level by choosing a rational method of determining saturation flows for these characteristics of traffic flows, geometric parameters of the intersection and infrastructure in its area. The subject of the study is the influence of the main characteristics of the traffic flow, parameters and infrastructure of the intersection on the saturation flow value. Goal. The aim of the work is the analysis of the influence of the main characteristics of the traffic flow, parameters and infrastructure of the intersection on the saturation flow value. Methodology. The calculation of the control regime at the intersection is based on determining the relation between the traffic intensity of vehicles at the intersection and the saturation flow value, which changes under the influence of a number of factors. Analytical calculation of the saturation flow value is based on using of correction factors that take into account the influence of these factors. Results. The methods of determination of saturation flows are analyzed out in the work; performed a comparative analysis of the definition of ideal saturation flows by different methods; a comparative analysis of the determination of the saturation flow correction coefficients for the parameters that have an effect on it were performed; the estimation of discrepancy at calculations of coefficients of correction of saturation flows by various methods is done; the list of coefficients which need to be considered at definition of their influence on a saturation flow is refined. Originality. In oppose to classical and other approaches to determining the saturation flow, the method recommended by the American "Highway Capacity Manual" takes into account more parameters of influence. It is proposed to use this method for the saturation flow calculation, but with an updated list of coefficients that must be taken into account in the calculations. Practical value. The results of the work can be used in the practice of improving the efficiency of signalized intersections in sections of the urban road network, as well as in further research on this topic.

scholarly journals Estimating Parameters for Traffic Flow Using Navigation Data on Vehicles

2020 ◽  
Vol 15 (4) ◽  
pp. 1-21
Author(s):  
Marija Burinskienė ◽  
Denis Kapski ◽  
Valery Kasyanik ◽  
Anton Pashkevich ◽  
Aleksandra Volynets ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Mathematical Models ◽  
Traffic Flow ◽  
Road Traffic ◽  
Navigation Data ◽  
Flow Parameters ◽  
Transport Flow ◽  
Two Fluid

The article describes the method for estimating transport flow parameters using the two-fluid Herman-Prigogine mathematical model developed considering the proposed method of estimating parameters for the system based on the passive processing of navigation data on the movement of vehicles. The efficiency of the suggested algorithms and mathematical models for estimating road traffic flow parameters and the system as a whole was confirmed performing tests using a set of tracks on the main highways of Belarus.

DETERMINATION OF PERFORMANCE INDICATORS OF THE TRUCK KrAZ-6510TE

2020 ◽  
pp. 19-26
Author(s):  
Olexandr Pavlenko ◽  
Serhii Dun ◽  
Maksym Skliar
Keyword(s):  
Mathematical Model ◽  
Surface Friction ◽  
Building Structures ◽  
Maximum Torque ◽  
Military Equipment ◽  
Military Vehicles ◽  
Force Magnitude ◽  
Vehicle Mobility ◽  
The Mathematical Model

In any economy there is a need for the bulky goods transportation which cannot be divided into smaller parts. Such cargoes include building structures, elements of industrial equipment, tracked or wheeled construction and agricultural machinery, heavy armored military vehicles. In any case, tractor-semitrailer should provide fast delivery of goods with minimal fuel consumption. In order to guarantee the goods delivery, tractor-semitrailers must be able to overcome the existing roads broken grade and be capable to tow a semi-trailer in off-road conditions. These properties are especially important for military equipment transportation. The important factor that determines a tractor-semitrailer mobility is its gradeability. The purpose of this work is to improve a tractor-semitrailer mobility with tractor units manufactured at PJSC “AutoKrAZ” by increasing the tractor-semitrailer gradeability. The customer requirements for a new tractor are determined by the maximizing the grade to 18°. The analysis of the characteristics of modern tractor-semitrailers for heavy haulage has shown that the highest rate of this grade is 16.7°. The factors determining the limiting gradeability value were analyzed, based on the tractor-semitrailer with a KrAZ-6510TE tractor and a semi-trailer with a full weight of 80 t. It has been developed a mathematical model to investigate the tractor and semi-trailer axles vertical reactions distribution on the tractor-semitrailer friction performances. The mathematical model has allowed to calculate the gradeability value that the tractor-semitrailer can overcome in case of wheels and road surface friction value and the tractive force magnitude from the engine. The mathematical model adequacy was confirmed by comparing the calculations results with the data of factory tests. The analysis showed that on a dry road the KrAZ-6510TE tractor with a 80 t gross weight semitrailer is capable to climb a gradient of 14,35 ° with its coupling mass full use condition. The engine's maximum torque allows the tractor-semitrailer to overcome a gradient of 10.45° It has been determined the ways to improve the design of the KrAZ-6510TE tractor to increase its gradeability. Keywords: tractor, tractor-semitrailer vehicle mobility, tractor-semitrailer vehicle gradeability.

Sign in / Sign up

Export Citation Format

Share Document