Lajos Kisgyörgy

Lajos Kisgyörgy
Budapest University of Technology and Economics · Department of Highway and Railway Engineering

PhD

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28
Publications
10,575
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107
Citations

Publications

Publications (28)
Article
Experience has shown that the durability of “high-modulus” asphalts made with modified bitumen is unsatisfactory. The misdirected “development” forced in recent decades necessitates a more accurate understanding of the mechanical behavior of rolled asphalts, i.e., constitutive formulation of a numerical asphalt model. The authors elaborate a numeri...
Article
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The congested traffic flow is significantly different from both the free flow and the non-congested but limited flow. Two of those differences are in the merging and crossing movements. Based on the conducted measurements, this movement could be up to 10 times faster in the congested condition. Another important feature is the giveway gestures. It...
Article
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Forecasting of traffic flow in the traffic assignment model suffered to a wide range of uncertainties arising from different sources and exacerbating through sequential-stages of the travel demand model. Uncertainty quantification can provide insights into the level of confidence on the traffic assignment model outputs, and also identify the uncert...
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The competitiveness of a travel chain largely depends on the travel conditions along the sequence of journeys within the chain. This paper shows a method to analyse and to optimize the service quality along a travel chain. Travel comfort is a very important qualitative feature of the public transportation service, where travel comfort is used in a...
Article
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Studying the uncertainty of traffic flow takes significant importance for the transport planners because of the variation and fluctuation of temporal traffic flow on all links of the transport network. Uncertainty analysis of traffic flow requires identifying and characterizing two sets of parameters. The first set is the link choice set, which inv...
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Managing the congestion is an old and legitimate claim of the cities. However, in spite of the promising solutions, the use of passenger cars outside the city centers did not decrease. The still hot topic requires a real solution.The goal of the traffic planning and management was to serve the traffic demands but with the increase in traffic, infra...
Article
Full-text available
Uncertainty can be found at all stages of travel demand model, where the error is passing from one stage to another and propagating over the whole model. Therefore, studying the uncertainty in the last stage is more important because it represents the result of uncertainty in the travel demand model. The objective of this paper is to assist transpo...
Conference Paper
Full-text available
There are a lot of high expectations about the appearance and spread of autonomous vehicles. There are clear advantages, which can be almost assured: autonomous vehicles will be more comfortable, the number of road accidents will be decreased, more people will gain access to the passenger car's benefits, and unimaginable traffic and business servic...
Conference Paper
Uncertainty can be found at every stage of travel demand model, where passed from each stage to another and propagated over the whole model. Thus, studying the uncertainty in the last stage (traffic assignment) is more important because it represents the result of uncertainty in the travel demand model. The purpose of this paper is to assist transp...
Conference Paper
Full-text available
Congestions are the natural consequences of the intensive use of the road network in the developed urban areas and are among the most critical negative factors on the urban life quality. There are several types of congestions, but the real damage is done by the recurrent congestions during rush hours. The road networks with recurrent congestion are...
Conference Paper
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Kivonat: A torlódó járműsor több, nagyon fontos tulajdonságában jelentősen különbözik mind a szabad sebességgel haladó járműfolyamtól mind pedig a korlátozott sebességgel, de folyamatosan haladó járműfolyamtól. A különbségek széles körűek és nagy volumenűek, alapvető forgalmi működési tulajdonságok változnak meg, így ezek a jelenségek meghatározók...
Conference Paper
Full-text available
In a case study about congestion in Budapest it is presented that in case of excessive congestion in the main direction of traffic flow, traffic from minor directions can still very easily access the overcrowded main direction. This phenomenon was named the vitality of the minor directions. Our study focuses on the vitality of these traffic directi...
Conference Paper
Full-text available
Congestion related traffic flow management requires the thorough analysis of dynamics of queues to develop effective control strategies. Traffic operation of signalized intersections is often hindered by congestions. Queues cause an additional delay decreasing the capacity of the intersection, because in dissipating queues the headways are longer t...
Article
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Travel demand models have an increasing role in decision- and policy-making. The prevailing practice of modelling raises some concerns, main limitations being of human and technical nature– adopting advanced models requires skilled professionals and resources. This paper introduces an open-access modelling concept, which is designed to overcome the...
Article
This paper presents a modular transportation modelling approach. In the proposed system travel demand is determined using existing statistics. All data describing a national road network and corresponding traffic demand is loaded into the software application, consisting of a web interface and managed database. Users have access to this dataset and...
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The importance and significance of the rat-run on the road network with recurrent congestion
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Traffic facilities are always an answer to the existing traffic demand of the society. However, traffic demand is deeply anchored in human nature. Impressive cases of traffic demand are the so-called desire paths, also known as human pathways or pedestrian trails. These allow us to study particular attributes of human habits. In previous works an i...
Article
The chemically stabilized rubber bitumen (CSRB) has been developed by researchers from the company MOL and the Pannonian University (Hungary). The CSRB is made of used automobile tyres, and it improves the quality of pavement, while also enabling an efficient use of used automobile tyres. Mechanical properties of the chemically stabilized crumb rub...
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After the description of the basic geometry and relationships of the hyperbolic transition curve geometry we made further analysis. In this paper we analyzed the possible minimal length of the transition curve based on the dynamical characteristics. We determined the relationship between the dynamical parameters and the p parameter of the transitio...
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The article deals with the usage of design patterns in transport design. Design patterns are complex information packages which represent possible generalized solutions of repeatedly occurring technological problems, described and stored in a uniform structure. Design patterns are well known and widely used in computer sciences where programmers ma...
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The article deals with the contemporary usage of design patterns optimized for transportation design, and compares two theoretical approaches how to deal with patterns. Design patterns are complex information packages which represent possible generalized solutions of repeatedly occurring technological problems, described and stored in a uniform str...
Conference Paper
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Topology analysis offers a useful tool to identify critical and vulnerable elements of the road network. This paper studies the characteristics of betweenness centrality and defines a new method to measure betweenness. Traditional methodology uses shortest path searches to determine the measure of centrality. Besides the usual shortest path search...
Conference Paper
Full-text available
One of the basic strategies of urban transportation is the promotion of public transportation modes. However numerous travels can not be served by public transportation because there is no adequate spatial or temporal cover of service or the travel chain is to complex. To solve this problem the design paradigm is needed: instead of vehicles the foc...
Conference Paper
Full-text available
Transportation network models contain numerous variables describing features of the physical network. Many of these variables are based on hypotheses or estimations. Integration of the implicated uncertainty is only partial. The Monte Carlo method is an effective tool for evaluating scenarios where certain variables could not be described precisely...
Article
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This paper describes a transistion curve geometry based on sine hyperbolic function. This geometry combines the advantages of the widely used chlotoide and cosine transition curves. The hyperbolic transition curve is parameterized, the characteristics of the transition curve depends on the parameter, creatinga continuous transition between the chlo...
Article
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The surface of roads and parking places could be regarded as a low-cost solar collector system. Using road pavements as alternative energy sources has several advantages. Renewable energy could be harvested, and the effective life span of the pavement structure could be extended by cooling down the hot pavement. By the reduction of the heat radiati...
Article
Full-text available
The Advanced Traffic Management System of San Antonio, Texas, called TransGuide System uses a sensor system installed in 26 miles of highway to feed data to a high speed computer network for analysis. The portions of interstates involved were generally confined to central city areas and did not reach the first outer loop that surrounds the inner ci...

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Projects (2)
Project
Predict people's movements in a separated but crowdly behaivour.