Volume-delay functions of minor junctions created by microsimulation

Vasvári, Gergely

doi:10.1556/pollack.9.2014.1.4

Cited by 5 publications

(7 citation statements)

References 2 publications

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“…This paper merges and extends two previously introduced concepts: intersection-specific time-delay functions [1] and affection radius of singular junctions [2].…”

Section: Introductionmentioning

confidence: 54%

“…Simulation models created for previous analysis [1] were stringed together to create chains of two and three intersections. To clearly discern junction-specific details of superposition the investigation was restricted to homogenous intersection sets.…”

Section: Frameworkmentioning

confidence: 99%

“…• Turning ratios were defined per • The composition of microsimulation models from the constructs introduced earlier [1] is according to Table 2. Length of downstream road section leading to the junction chain and intermediate road sections linking particular intersections are displayed on the table.…”

Section: Frameworkmentioning

confidence: 99%

“…

AbstractRelationship of traffic volume and travel time delay of vehicles passing specific road intersections may be described with a formula analogous to volume-delay functions of uninterrupted road sections [1]. Presumably the number of, and distance between junctions on a road section also has large impact on the shape delay functions besides the intersection layout.

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confidence: 99%

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Additive Effects of Road Intersection-Specific Volume-delay Functions

Vasvári

2015

Period. Polytech. Civil Eng.

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Relationship of traffic volume and travel time delay of vehicles passing specific road intersections may be described with a formula analogous to volume-delay functions of uninterrupted road sections [1]. Presumably the number of, and distance between junctions on a road section also has large impact on the shape delay functions besides the intersection layout. Of these two additional aspects the effect of intersection quantity is evident: the more junctions are on a road, the higher is the delay of individual vehicles. The current paper presents a specific method to evaluate traffic flow measurements and determine intersection-specific volume-delay function parameters for different types of homogenous junction-chains on a closed road section.After laying down the principles of function fitting and before switching over to analyse the effect of junction quantity, assessment of the second aspect will be presented. Distance between particular intersections is also an important attribute in the quantization of time delay. When junctions are close, congestion caused by an oversaturated intersection is affecting neighbouring junctions' traffic flow triggering traffic jams remotely or amplifying already existing ones. For the spatial limit of junction interaction the concept of 'affection radius' [2] is utilised in the paper to demonstrate that intersection distance has no effect on the shape of delay function -due to a specific restriction of function fitting.

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“…This paper merges and extends two previously introduced concepts: intersection-specific time-delay functions [1] and affection radius of singular junctions [2].…”

Section: Introductionmentioning

confidence: 54%

Section: Frameworkmentioning

confidence: 99%

Section: Frameworkmentioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

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Additive Effects of Road Intersection-Specific Volume-delay Functions

Vasvári

2015

Period. Polytech. Civil Eng.

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“…In spite of these shortcomings of VDF, a better way of estimation is still to be discovered. [6], [7], [8] In an aforementioned research the authors of this paper studied the issue of forecasting travel time reliability for urban roads, and in the course of the analysis an essential question has arisen on whether the fundamental speed-flow diagram is valid for urban road traffic. During the research, some peculiar things have been noticed and that provided the motivation for this study which assesses the relationship between the saturation level (referred as F/C, the ratio of traffic volume and the capacity of the road, which is a universal parameter of traffic state) and the average travel times (or in a derived way: average speeds).…”

Section: Methodology and Datamentioning

confidence: 99%

Analysing the Speed-flow Relationship in Urban Road Traffic

Juhász

Koren²,

Mátrai³

2016

Acta Tech Jaur

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In road traffic, speed-flow curves describe the relationship between vehicle flow rates and average vehicle speeds. These functions are one of the basic elements of transport modelling and they are widely used in project appraisal. Review and re-validation of speed-flow relationship has become timely in recent years as vehicle fleet changed, average traffic volumes increased and more comprehensive, automatic data collection became available. This study used the database of the road operator in Budapest to simultaneously analyse travel times and traffic volumes. The paper aims to examine the validity of the well-known fundamental diagram for urban roads, to provide an estimation for the speed-flow curve based on the Budapest case and to assess the on-set process of congestion.

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Traffic performance of signalized circular intersections

Barna

Schuchmann

2017

Pollack Periodica

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Traffic control strategies of signalized circular intersections are analyzed in this article after a brief overview of traffic lights in roundabouts. A detailed description was made on the 'direct' mode of operation of the Hungarian regulation describing three types of control program. Finally a comparison of traffic performance is given based on the main geometric features and parameters of the signal programs with a description of the signal plan structure. The PTV Vissim environment was used to examine and evaluate the performance of each combination through the average delay per vehicle resulting proposals for the application as well as for further studies in subject.

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Volume-delay functions of minor junctions created by microsimulation

Cited by 5 publications

References 2 publications

Additive Effects of Road Intersection-Specific Volume-delay Functions

Additive Effects of Road Intersection-Specific Volume-delay Functions

Analysing the Speed-flow Relationship in Urban Road Traffic

Traffic performance of signalized circular intersections

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