The article deals with bumper-to-bumper driving. A .systemicapproach to car-following (bumper-to-bumper driving)i.s described and the mathematical model has been developedand solved. With this approach an algorithm for analytical andnumerical solutions has been developed.

To allocate a fleet of vehicles to a given number of locationsand to redistribute free vehicles are important control problems.In this paper we use the results for multi-location inventorymodels to develop an approximate solution for the combinedfleet sizing and redistribution problem. For a defined rewardstructure we investigate:a) some properties of the optimal redistribution and allocationdecision respectively;b) the concavity of the expected one-period reward;c) the advantages gained from co-operation of locations overindependent locations.Since a model with discrete time is used, the proposed solutionis an approximation. The two-location model is investigatedin more detail.

Ecological indications and the depletion of fossil fuel resourcesare the main reasons for current studies of alternativepropulsion in aviation i.e. for searching for new regenerativeenergy sources. The technical and technological presumptionsfor the transfer from the conventional to alternative fuel aremore radical than the transition from piston to jet propulsion.The main problems include the production of liquefied hydrogen,the necessary aircraft structure modifications, and the requiredinfrastntcture supporl.

The quantification and types of costs in the river/touristtransport can be approached from different viewpoints.In river transport, the respective division into individualgroups or types, as compared to the total costs appears to be ofinterest.Apparent is the interdependence of individual costs and thelevel of utilisation of ship capacities (during a pleasure voyage).The basic costs of transport in river (liner) shipping are,thus, the costs of ship 's liner voyage, at average utilisation of thecapacities corresponding to the long-term anticipated demandfor ship space and specified profit, as well as the costs of capital.In the system of tourist/river transport. the costs involve:- total fued costs,- total variable costs, and-total voyage costs.All these groups include their sub-types in relation to shipvoyage, in quality and quantity terms.

A multinational Project Trans Europe Lines (TEL) is ofgreat importance for the present development as well as for thefuture role and situation of telecommunications in the cowl·tries of Central and Eastern Europe (CEE). The idea of the necessityof constructing a fibre optic (FO) telecommunicationb1idge between Eastem and Westem Europe was initiated bythe Deutsche Bundespost Telekom and presented to some ofthe telecommunication administrations in that region in theyear 1990. The basic aim of the Project is to enable all countliesto improve and satisfY the telecommunication needs on internationaland national levels, to ensure sufficient transmissiontelecommunication infrastrncture in intemational traffic, toenable establishing of intense economic interrelations, to providethe basis for the development of future telecommunicationservices, and to support complete economic development in theCEE region.After its initialisation, the TEL Project was graduallyjoined by new Members and by the end of 1996 it included 16countries. Since initialisation until the end of 1996 TEL almosttripled in size regarding the physical area covered, and it becametwice as big regarding the involved number of inhabitants(potential subscribers).VarimLSt reasons were the 'driving force' for the numerouscountries insufficiently developed in the field of telecommunicationsand involved in the Project (as, for example, for the Republicof Croatia, in which TEL strongly supported its telecommunicationsdevelopment in spite of the difficulties of the warperiod 1991-1995 in the country).Thanks to the FO cable transmission systems which havebeen or are still being built within the framework of the TELProject and which represent the infrastntcture for the true CEEinformation highway, in the field of telecommunications, theProject M embers are not only connected among themselves butalso with the whole world, since the direct access points to TELare at locations of numerous 'landing points' of the intemationalFO submarine cables.

The paper analyses the up-to-date research in developingmagnetically levitated (MAGLEV) motorcars. It presents thehistorical overview of the development of the most famousmagnetic levitation systems of today.Apart from describing the operation method and the technicalfeatures of each system, the paper ana(vses the advantagesand drawbacks of certain systems, as well as the advantagesand drawbacks of magnetically levitated motorcars comparedto conventional railway.The paper presents the plans for the future as well as the systemswhich have the highest prospects of being also commerciallyand not just experimentally used.

ADSL (Asymmetric Digital Subscriber Line) is a technologythat allows transmission at 8.488 Mbps over the existingtelephone copper line (speed range depending on the distance).ADSL circuit connects the ADSL modems by twisted-pairtelephone lines creating three infonnation channels: high speedsimplex (maximum 9 Mbps), medium speed duplex channel(maximum 2 Mbps) and plain old telephone service channel.ADSL technology supports up to seven synchronous channelsthat can be configured to meet the needs of the end user.One could simultaneously view four movies stored in MPEG 1fonnat on separate television sets (MPEG 1 transmitted at 1.5Mbps), hold a video-conference (transmitted at 348 kbps),download data files from a server at 128 kbps via ISDN andeven receive a telephone call.

The fleet of cars as one of the factors in the technologicalprocesses in transport has to be dimensioned in the optimalway. Market requirements are continually subject to changes,hence the demand for transportation services has to be modelledby means of quantitative methods. A mathematical modelfor determining the optimum size of the motor pool finds in thepaper its hypothetical presentation.

The paper deals with strategic goals and decisions to betaken for the integration of Slovenia into the European Union.One of the most important factors of this integration is transportation.This process should not be chaotic or driven by blindforces but carefully and strategically orientated in the macroand the micro field.The paper also suggests general strategy of transportation,defines goals, measures to be taken and identifies authorities.

1991 was the first year of operation of the Croatian Postand Telecommunications (HPT) in the independent state ofCroatia.The public corporation HPT- Croatian Post and Telecommunicationswas established by a resolution brought by theCroatian Parliament followed by a decree pronouncing the Acton founding of the public Croatian postal and telecommunicationcorporation.This survey has studied, analysed and evaluated the internationalexchange of Croatian Letter mail with the rest of theworld from 1991-1996.

Continual growth of world maritime trade involves thegrowth of world shipping-industry capacities. This growth impliesnot only bigger ships and greater overall capacities, butalso some technical and technological changes that includenew ships, specialisation and development of new technologieswithin the maritime traffic.Due to complex navigation conditions, newer and more expensiveships that represent very complex and sensitive objects,the competition and human factor, the safety problem has oftenbeen out of control.The governments of countries within /MO and ILO increasinglyintroduce new rules and conventions to enhancenavigation safety. However, in view of economic-financial effects,many shipping companies overlook the safety problem.The most recent revision of STCW Convention and theISM Code implementation, which are becoming operative inthe current years, aim to increase the overall culture of qualitymanagement (QM) and to enhance the safety management onships and in maritime companies.

Over three million wooden sleepers are built into the Croatianrailway tracks. The durability of these sleepers depends verymuch on the fastening between the sleepers and the rails providedby the sleeper screws. The author suggests various systemsfor the fastening of the sleepers and the rails, especial~v in caseof the old ones, and particularly using the plastic replacingdowels.

The paper examines the effects of implementing the panEuropeanmobile cell system -GSM (Global System for MobileCommunications) in the total tourist trade of the Republic ofCroatia, the procedure of its planning and integration in Croatia's telecommunication network and the influence on theEuropean and world-wide developments in trade and tourism.Special emphasis is laid upon the accessibility and range ofmobile se1vices that result from adequate network planningand the control of network traffic flow.The essential factors that influence service quality from theuser standpoint are identified.