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

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.

Download Full-text

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

Applied Sciences ◽

10.3390/app11219914 ◽

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.

Download Full-text

DETERMINATION OF TRAFFIC FLOW PARAMETERS IN DIFFERENT TRAFFIC FLOW INTERACTION CASES

Transport ◽

10.3846/16484142.2007.9638131 ◽

2007 ◽

Vol 22 (3) ◽

pp. 236-239 ◽

Cited By ~ 13

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.

Download Full-text

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

Put i saobraćaj ◽

10.31075/pis.65.02.05 ◽

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.

Download Full-text