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Vesna Kos, Dražen Kovačević
1993 (Vol 5), Issue 6

The paper deals with traditional means of information in traffic as well as modern systems as additions to traditional methods. The paper discusses the advantages and disadvantages of new information system technologies and the needs of transport companies in the future.

Miroslav Bjele
1993 (Vol 5), Issue 6

The paper deals with an effective and economic method of telecommunications network introduction in rural areas, by provision of digital subscriber radio-systems with multiple access (TDMA - Time Division Multiple Access). After a description of general characteristics of rural areas according to CCITT definition, special aspects have been reviewed that can be considered in our conditions. In addition to discussion of some special aspects of the rural telecommunications network planning procedure, due attention has been paid to a description of rural subscriber TDMA system planning. Furthermore the paper deals with general and technical specifications of the TDMA radio system and its application in the Croatian telecommunications system.

Ernest Bazijanac, Angela Milanović
1993 (Vol 5), Issue 6

The paper deals with the description of a computer program designed for the estimate of aircraft theoretical performances. The program has primarily been designed for teaching purposes. It has been based upon one simple mathematical model, given in Fortran 5.1. and applied on PC. The results of the program are displayed in graphic and textual form. It refers to an example of the estimate. of the Cessna Citation 3 theoretical performances.

Jasna Golubić, Nada Štrumberger
1993 (Vol 5), Issue 6

The paper deals with some possibilities of reduction of Diesel engine exhaust emission hazards. For purposes of purification of exhaust emissions, the in-built filters can be provided, like ceramic filters for sooth and water filters for gases. The oxidation catalyst may also be provided in addition to filters. Hybrid systems have been tested in 'Golf' automobiles i.e. the combination of internal combustion engine and electric drive. This vehicle has been named 'Eco Golf'. A mixture of Diesel fuel and n-butanol in the ratio of 60:40 has been used as the alternative fuel introducing the reduction of NOx by 8% and of particles by 36%. All limit values of Diesel engine exhaust gas components have been given in ECE R49 test.

Željko Radačić
1993 (Vol 5), Issue 5

Traffic policy as an integral part of the overall economic and development policy of any country refers to an interactive relation of objectives, measures, instatements and entities making its consistent segments requiring an optimum structure of the traffic system and its successful functioning. Defining the strategy of reconstruction and development of the Croatian traffic system refers to a higher degree of concretization, starting from the traffic-aspected assessment up to determining and defining the traffic policy. New political/legal and international conditions as the factors of the general environment in which Croatia shall act as an independent and sovereign counlly, the forthcoming period of reconstruction and economic development, the need for massive investments into the overall traffic system, particularly into the traffic infrastructure, all this calls for defining the strategy and strategic development trends of the entire traffic system and individual traffic aspects. The traffic policy should define priorities and strategic objectives while the system of corresponding legislative/legal and economic instruments should grant their materialization.

Stipan Matoš
1993 (Vol 5), Issue 5

The paper deals with the issue of introduction and removal of traffic signs, warning motorists of danger due to slippery roadway caused by different atmospheric conditions. The study points out the lack of coordination with respect to standardization, quality, provision, and location of traffic signs. Particular reasons are given in support of keeping these signs with recommendations for their permanent keeping on the locations of erection.

Dragan Badanjak
1993 (Vol 5), Issue 5

Modern organization of traffic sets the prerequisite of introduction of the management/information system to create the possibilities for the application of new scientific propositions in the management of the traffic process. Considering the 'interactive aspect' in the operation of rail traffic, quality- aspected (timely) compilation and processing of respective data is of major importance in application of new engineering/technological solutions. This paper is designed to refer to the need for continuous research activities and introduction of new methods and aspects of work.

Dražen Topolnik, Vladimir Marić
1993 (Vol 5), Issue 3-4

Theoretical study has covered the advantages of utilization of highways for traffic of freight vehicles and road toll payment. The conclusion has been drawn that the utilization of highways for traffic of heavy vehicles appears indispensable and highly justifiable also in the conditions of road toll payment. In illustration of the structure of the traffic flow on the roads in Croatia, a detailed structure has been shown for the sections of the highway on the Zagreb-Prvča (near Nova Gradiška) route.

Antun Smrček
1993 (Vol 5), Issue 3-4

Transportation costs depend upon the conditions in which the service is operated. It is necessary to introduce new organization of the transportation process. New organization has to make it possible for individual vehicles of the motor pool to spend as much time as possible transporting freight. New technological developments in tntcks manufacturing create the possibilities for reducing the freight loading/ unloading process to a single minute or less. This further enables better making use of the driver's working time. Also, vehicles could be changed in transport of special loads. This then increases the efficiency of the motor pool and decreases the transportations costs.

Marijan Rajsman
1993 (Vol 5), Issue 3-4

A large sample of departures of a service operated by a transport company in public suburban passenger road traffic has been used for the study of random variable CJp expressed by the average number of passengers carried per stop-to-stop sections of the suburban route, as one of the essential bus utilization and output indices. Depending upon the system of scheduled departures, the mean value of variable CJp has been obtained which for departures in a workday is 17 passengers per a stop-to-stop section of the route and 7 passengers for departures on Saturdays. The obtained mean values of the observed variable make it possible for us to compute the coefficient of static utilization of transport capacities, i.e. the average utilization rate of bus transport capacities on suburban lines: 21% on workdays, 14% on Saturdays, 9% on Sundays. It has been established that variable CJp adopts its values by the exponential law of probability, i.e. the values from the sample originate from the basic array of exponential distribution. the difference between the arithmetic means of the examples of variable CJp depending upon the system of departures maintained, has yielded a statistically significant difference and at the same time confirmed the justifiability of the applied variable analysis methods.

Mira Kolar-Dimitrijević
1993 (Vol 5), Issue 3-4

Natural barriers on the route between the seaside and North Croatia have to a degree always hindered traffic and transport of people and goods. This has readily been accepted by different opponents of unified Croatian national territory, advocating the optimal aspect of linkage of the Balkan region on the East- West horizontal rather than on the North-South vertical, so that such ideas have been promoted and materialized on many occasions in the past.

Branimir Burmaz, Branko Tudor, Ante Matešić
1993 (Vol 5), Issue 3-4

The paper deals with the interdependent aspect of telecommunications and tourist trade, their correlation and common interests. Contribution of telecommunications is manifested in quality, structuring and materialization of business policy of the travel trade. As different, by the action of demographic, economic, technological and social/cultural forces it tends to bring together the tourist trade essentially affects the functioning and development of telecommunications as one of its infrastructure elements or, otherwise, a specific segment. Travel market being directly integrated into the international market most quickly reacts to the international development trends, the rejvre to the development of telecommunications as well. The indispensable introduction of new services is further pronounced in the changes to be caused by the integration of the 12 national markets of the EC in to a single unified market with access granted only upon eliminating all technical obstacles for the appearance on this market.

Nada Štrumberger, Husein Džanić
1993 (Vol 5), Issue 3-4

Constant increase of the number of automobiles causes demand for individual materials to get on the rise, thus giving an impulse to the development of recycling logistics. Used automobiles get disassembled and individual parts which can be used as raw materials or additives get recycled. Automobile tires can be reclaimed or vulcanized. In July 1978 the environmental-friendly 'Blauer Engel' or 'Blue Angel' symbol was first introduced for reclaimed tires. Later, emblems were introduced for other recycled automobile pans. The awarding of the emblem is being controlled and approved by authorized institutes, because the emblem rightfully designates traffic safety.

Berislav Grozdanić
1993 (Vol 5), Issue 3-4

Education of operators in air, road and rail transport is particularly significant for traffic safety. It. can generally be divided in to three stages (selection, theoretical and practical part, and training in the course of service). Numerous are the factors affecting the efficiency of an operator, while ergonomy being part of industrial psychology gives answers to the essential issues and measures for the elimination of adverse effects in operators. . The modern school and university system as well as the economic system of the Republic of Croatia have been meeting the world standards in operator education by way of the scientifically grounded training of manpower. It is necessary to find common grounds in education of operators in all segments of the transport industry.

Boris Kancir
1993 (Vol 5), Issue 3-4

On the defined model, the paper deals with the thermal dynamic analysis of functioning of the model of type H20- -NaCl protection mixtura making and the impact of condition changes of the obtained mixture upon tje reliability of the tangential friction force introduction and the factore of working the carriageway surface with the tires of teh givan vehicle.

Željko Radačić, Ratko Stanković
1993 (Vol 5), Issue 2

With respect to the characteristics of conventional methods for setting up the traffic/technological system in air transport and having in mind the very nature of these systems, the advantages of application of the Monte Carlo method have been discussed to create the possibilities for a different high-quality approach to the issue.

Ivan Dadić, Vlado Dadić
1993 (Vol 5), Issue 2

This paper deals with an as efficient as possible conversion of energy of human rustles and different types of piston and rotation engines by way of devices given the common name of propulsions, by means of specially designed surfaces which in the process of rotation create an almost maximum driving force. The basic structure of these natural propulsions i.e. surfaces is a curve in the plane which is delineated by the particle of the matter which is due to the rotation affected by the centrifugal and tangential force i.e. their resultant as well as the curve vertical on to it. Research of natural propulsion refers us to the research of natural eccentricity or disbalance in general that may prove of influence on the design of cylinder and electric machines and have further repercussions on the design of different types and shapes of craft and vessel.

Ivan Bošnjak
1993 (Vol 5), Issue 2

By traditional approach and financing models the national telecommunications operator’s list growth rates of typical 3% up to maximum 6% annually. Innovative/business inspected approach and bridging of the existing managerial financial 'gap' it is possible to reach the growth rates of 7-12%. With support of telecommunication policy, more liberal regulations and structured financial infrastructure, telecommunications expansion can mark the rate in the order of 15-20%. · The countries of Eastern Europe have respective requirements and demand for expansion. Some of them take adequate steps towards the introduction of adequate legal/ political regulations and managerial/financial training of telecommunications operators for the materialization of the set-up objectives.

Slavko Jaram
1993 (Vol 5), Issue 2

It is necessary to continually coordinate the tariff .system in telecommunication traffic with the engineering and technological developments in the field of telecommunications and the reached development stage of the telecommunications network of a coolly. The paper deals with the guidelines of essential meaning for the structuring of the tariff system being up to the level of Promet, vol. 5, 1993, br. 2, 63-67 the reached development stage of the telecommunications network. The last example of modernization of our tariff system has been discussed in a concise manner to bring it closer to the .systems of Western Europe in terms of making it more familiar to them.

Vitomir Grbavac, Franko Rotim, Jozo Markić
1993 (Vol 5), Issue 2

In this paper model of car repair service management is described. This model can be used both for management and control of car repair services, by keeping records of performed works and records of spare parts hand out. System this way enables planning of works and vehicle admittance, as well as precise accounting and generating of various reports.

Miroslav Mikula
1993 (Vol 5), Issue 1

The paper first deals with a review of technical properties and utilization potentials of the integrated digital network with common telecommunications services - the ISDN. The author then discusses the development of the ISDN in Europe and in Croatia. Finally the paper offers an assessment of the future development of the ISDN.

Zoran Lulić
1993 (Vol 5), Issue 1

This paper deals with some new things in legal provisions on environmental pollution from motor vehicles as implemented in the EC member states. Besides discussing some novelties, the paper deals with the existing situation and makes a review and gives a concise description of tests to be met by each new model of motor vehicles to be granted a certificate for sale on the European market.

Renata Fox
1993 (Vol 5), Issue 1

On the example of the segment of German technical reading materials (professional publications, periodicals, bus mess correspondence) dealing with international goods turnover and forwarding the author has attempted a review of the so called 'special language'. Gennan as used in forwarding fits into the general concept of a special language (or technical language) to a major extent from lexical, syntactic and textual aspect. On the other hand it shows certain specific qualities: it makes a combination of a number of technical jargons: legal, administrative, engineering, commercial, financial and banking operations. The lexical elements of English are rather expressedly present. In the teaching process these specific aspects set the requirement for making use of professional publications, students' extra linguistic knowledge and their knowledge of other foreign languages.

Branko Gelo
1993 (Vol 5), Issue 1

The paper deals with some basic aspects of meteorological service management as related to safety and smooth operation of surface transport (road, rail, postal, telecommunications, internal circulation, pipelines, funiculars, pavements and pathways) with reference to different problems regarding safety hazards, environmental protection, economy problems, time-tables and frequencies and transport industry. A review has been made of respective presentation and methods of forwarding given meteorological elements and aspects (reports, forecasts, maps) as required for surface transport with reference to traffic routes (climatological, synoptic-weather).

Josip Zavada
1993 (Vol 5), Issue 1

This paper deals with the measures that may be taken in the engine and outside the engine in an effort to reduce the harmful motor exhaust gas concentration emissions. These measures are being taken and elaborated with the prospect of meeting the increasingly requiring legal provisions on allowed concentrations of harmful exhaust emissions. This is meant to show the extent to which individual measures influence the level of emission of individual components, discussing at the same time the character of individual measures. The paper further reiterates the indispensability of optimization of all measures taken in the engine to reduce the emission of harmful exhaust gases to the minimum.

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University of Zagreb, Faculty of Transport and Traffic Sciences
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