New type of roundabout: dual one-lane roundabouts on two levels with right-hand turning bypasses - "target roundabout"Tomaž Tollazzi
, Goran Jovanović
, Marko Renčelj
, 2013, kratki znanstveni prispevek
Opis: The problems of low level traffic safety on multi-lane roundabouts have been resolved in various ways in different countries, usually by using alternative types of roundabouts that reduce the number of conflict points. Alternative types of roundabouts typically differ from "normal" or "standard" roundabouts in one or more design elements, as their implementation purposes could also be specific. Today, several different types of roundabouts are already in use ("mini", "double mini", "dumb-bell", those "with joint splitter islands" ("dog-bone"), those "with a spiralling circular carriageway" ("turbo"), those "with depressed lanes for right-hand turners" ("flower") etc.). This paper introduces a new type of roundabout, dual one-lane roundabouts on two levels with right-hand turning bypasses, namely the "target roundabout". This paper describes and analyses their design, traffic safety, and capacity characteristics, compared with the standard two-lane roundabouts.
Ključne besede: roundabouts, alternative types of roundabouts, turbo roundabout, target roundabout
Objavljeno: 05.06.2017; Ogledov: 54; Prenosov: 3
Celotno besedilo (1,33 MB)
New feeder line rail freight paradigm for the European railwaysStanislav Božičnik
, 2006, kratki znanstveni prispevek
Opis: The article deals with the development of the new paradigm of the European rail freight system predominantly suitable for the feeder lines (market niches). Taking into consideration the so far adopted legal solutions of the EU Commission for internationalisation (liberalisation) of the European railway system, the concept of the new rail freight model was developed in order to contribute to the increase of the quality, as well as to the growth of the volume of the rail freight services in Europe. Based on the findings about the disadvantages of the existing rail freight paradigm, the new solution consisting of the three interrelated and interconnected subsystems: institutional, technical/technological and organisational, is proposed. New liberalised access to the entire European rail infrastructure network will increase the competition and most probably attract new railway freight service providers. The introduction of the suggested innovative solutions in form of small, self-propelled, bi-directional train formation that can be automatically coupled and decoupled and equipped with the innovative loading and unloading equipment (enabling loading/unloading operations wherever the truck can stay parallel to the train), is to be expected predominantly on the feeder lines (market niches) of the European railways.
Ključne besede: rail freight, EU transport policy, railway freight system, rail freight paradigm, innovative freight technological solutions, transport policy
Objavljeno: 05.06.2017; Ogledov: 67; Prenosov: 5
Celotno besedilo (2,81 MB)
New approach to determining visibility length on passive protected level railroad crossingsDrago Sever
, 2012, kratki znanstveni prispevek
Opis: The paper is based on the question whether the existing (legislation determined) method for determining the visibility length on passive protected level railroad crossings insures the relevant level of traffic safety. It has been recognised that using of such method does not provide stopping of road driver vehicles in front of railroad crossing in all conditions. Based on such conclusion a new approach to determining visibility length on passive protected level railroad crossing is proposed. The new approach is based on the assumption that it is necessary, primarily on level railroad crossings with local roads to recognize the worst possible and expected road and weather conditions. The testing of the proposed method in the real environment has shown that at lower speeds of road vehicles there is almost no difference, and that important benefits are recognised for the speeds of 30 and 50km/h where longer stopping distances of road vehicles have been detected (road vehicle can stop safely in front of a rail crossing) with almost the same visibility lengths. The use of the proposed method could have important impact on the increase of traffic safety on passive protected level railroad crossings.
Ključne besede: traffic safety, visibility field, level railroad crossings
Objavljeno: 05.06.2017; Ogledov: 49; Prenosov: 3
Celotno besedilo (892,41 KB)
Multimodal transport operator liability insurance modelRatko Zelenika
, Tomaž Lotrič
, Ervin Bužan
, 2011, kratki znanstveni prispevek
Opis: Multimodal transportation means transporting goods from a pickup point, where the operator receives the goods, all the way to the delivery location, using at least two different means of transportation, covered under the same multimodal transport contract and by only one document, regardless of the number or type of transportation vehicles used. The key factor to the optimal operation of multimodal transportation is the multimodal transport operator. It is up to this individual to compensate for various unpredictable circumstances, the complexity of the business processes, nature’s whims and carelessness. He must also organize and execute multimodal transport in all stages. Due to the above mentioned dangers and the fact that the area of liability insurance for multimodal transport operators is still being neglected, this article raises some valid points in favour of a proposal that would cover all of the transportation means as well as all the accompanying activities with a single insurance policy. The model includes 17 elements of liability insurance for a multimodal transport operator and all values which quantify the insurance elements in 2009 as well as the projected values for 2015, when progress is expected in the areas pertaining to the implementation of economical processes concerning transit development, as well as values for 2025, representing a period of innovation, reconstruction, optimization and modernization. With this supposed model for liability insurance of a multimodal transport operator, the foundation is laid for a liability insurance which would be used by a multimodal transport operator.
Ključne besede: transport insurance, multimodal transport, multimodal transport operator, multimodal transport operator liability systems
Objavljeno: 05.06.2017; Ogledov: 78; Prenosov: 4
Celotno besedilo (430,14 KB)
Multicriteria optimisation in logistics forwarder activitiesTanja Poletan
, Alen Jugović
, Ratko Zelenika
, 2007, izvirni znanstveni članek
Opis: Logistics forwarder, as organizer and planner of coordination and integration of all the transport and logistics chains elements, uses adequate ways and methods in the process of planning and decision-making. One of these methods analysed in this paper, which could be used in optimisation of transport and logistics processes and activities of logistics forwarder, is the multicriteria optimisation method. Using that method, in this paper is suggested model of multicriteria optimisation of logistics forwarder activities. The suggested model of optimisation is justified in keeping with method principles of multicriteria optimization, which is included in operation research methods and it represents the process of multicriteria optimization of variants. Among many different processes of multicriteria optimization, PROMETHEE (Preference Ranking OrganizationMethod for Enrichment Evaluations) and Promcalc& Gaia V. 3.2., computer program of multicriteria programming, which is based on the mentioned process, were used.
Ključne besede: traffic, transport, forwarding, logistic chain, planning, optimisation, PROMETHEE
Objavljeno: 05.06.2017; Ogledov: 88; Prenosov: 6
Celotno besedilo (3,86 MB)
Model of sustainable growth and development of the cableway transport system in SloveniaSergej Težak
, Ratko Zelenika
, Drago Sever
, 2011, izvirni znanstveni članek
Opis: The cableway transport system is very important for the Slovenian tourist economy. Within the Slovene transport system, the cableway transport subsystem has a specific role because it allows and ensures access to regions which are difficult to access or completely inaccessible by other transport subsystems owing to the configuration of the area. The quality and development of transport services are directly linked to the introduction of new cableways. New technical achievements, which are nowadays used in cableways, all provide greater capacity and higher speed of cableways, which, however, results in their higher maintenance and exploitation costs.
The cableway transport system is being developed in Slovenia, but not on principles of sustainable development. This paper presents a model of sustainable growth and development of the cableway transport system in Slovenia based on which it is possible to determine assumptions for future growth so that the Slovene cableway transport system would approach standards of such highly developed systems. The new model includes ten essential elements of this system for which growth rates were calculated.
Ključne besede: cableway transport system, cableways, econometrics, growth matrix, sustainbale growth, winter tourism, mountain tourist centre
Objavljeno: 05.06.2017; Ogledov: 70; Prenosov: 4
Celotno besedilo (513,45 KB)
Model approach to quality provision of public passenger transportRoman Krajnc
, Drago Sever
, 2010, pregledni znanstveni članek
Opis: Modern approach to transportation system research is based on the system theory. System analysis is relevant. Constant transportation technique and technology development caused by the need of conformation to the new market conditions is the basis for such an approach. The model approach for resolving the problems of public passenger transport is provided in a scientific report. The model of quality of passenger transport comprises the submodels which define relevant measures for the provision of passenger transport quality. The synthesis of sub-model for adoption of quality standards, submodel of passenger demands, submodel of operation safety and security and economic submodel construct the model of quality of public passenger transport (PPT). Its evaluation has been carried out using SWOT analysis.
Ključne besede: public passenger transport, traffic, lines, network quality, mobility
Objavljeno: 05.06.2017; Ogledov: 89; Prenosov: 5
Celotno besedilo (212,87 KB)
Measuring the intellectual capital of international carriers as logistic operatorsSabina Kamnik Zebec
, Ratko Zelenika
, Slobodan Zečević
, 2007, kratki znanstveni prispevek
Opis: The age of knowledge has come and the enterprises present themselves as "knowledge enterprises" and their employees as sources of knowledge - "knowledge workers". Knowledge has become a merchandise, to be on the knowledge market. In an enterprise knowledge becomes the capital, important for achieving competitive advantage on the market but it cannot be measured easily. The field of intellectual capital is very complex, mostly because it is difficult to categorize it. The important concepts and definitions for intellectual capital include an emphasis that intellectual capital is based on knowledge and is usable in any enterprise. Knowledge and skills determine the possibilities of an individual to actively influence the social development and ensure their quality of life.
Ključne besede: enterprises, intellectual capital, tertiary logistics, balance sheet, income statement
Objavljeno: 02.06.2017; Ogledov: 127; Prenosov: 4
Celotno besedilo (5,33 MB)
Management of traffic congestion in urban areasVilibald Premzl
, 2000, pregledni znanstveni članek
Opis: The use of road vehicles is increasing, the benefits they afford have been progressively diminished by external costs. Whereas traffic increases as we approach the centre, the road and open space decreases. The greater specialisation allows the city growth in size and in traffic attraction. In this way urban growth feeds itself. Inter-urban transport facilities also become more extensive. Growth in size of the city generates greater amounts of traffic and can eventually give rise to agglomeration diseconomies. Higher transport costs, offices and shops, attracted by the accessibility of central locations, gradually replace residential uses, people being forced to seek housing in the suburbs. As the urban area expands and offices in the city centre are built denser and higher, traffic congestion increases. This may result in the fall in central land values, since accessibility diminishes with the saturation of transport network. Increased pollution takes various forms as noise, smoke and overcrowded housing in the centre, urban decay in the transitional zone as commercial development is anticipated.
Ključne besede: road traffic, urban traffic, city growth, traffic congestion
Objavljeno: 02.06.2017; Ogledov: 104; Prenosov: 3
Celotno besedilo (1,96 MB)
Logistic operator - fundamental factor in rational production of services in multimodal transportRatko Zelenika
, Drago Sever
, Sabina Kamnik Zebec
, Bojan Pirš
, 2005, pregledni znanstveni članek
Opis: From its theoretical and practical point of view, traffic is one of the fundamental factors of the economy in a state. In the developed European countries, a rational production of transport services is presented by multimodal transport and the correct selection of a logistic operator. The aim of multimodal transport is to link together different forms of traffic in the most effective way, as well as all operations considering transport. The logistic operator is the only professional to perform complete services in multimodal transport, therefore it was necesarry to enable its further development and, in accordance with that, to suggest suitable solutions. An increase of the existing and the creation of new traffic currents can only be achieved with the development of multimodal transport, the correct selection of logistic operator and better organisation of the traffic system. In the future, the Republic of Slovenia should continue developing multimodal transport in order to decrease the differences in forms of transport in the developed European countries in the shortest time possible.The main task of the Republic of Slovenia is to integrate into the European flows as soon as possible, engage in a reciprocal cooperation by liberalization of flows of commodities and services, and create conditions for the inflow of foreign capital where all advantages of multimodal transport come into consideration. The result of the research is a model of multimodal transport logistic operator connecting the basic elements of that transport.
Ključne besede: logistical operator, rationalization, multimodal infrastructure, multimodal suprastructure, multimodal technologies, multimodal movement of goods, logistical information systems
Objavljeno: 02.06.2017; Ogledov: 112; Prenosov: 5
Celotno besedilo (5,25 MB)