The article presents a systemic approach to air traffic op·eration and control in which the airport represents a basictechnical-technological and organisational system. Determiningoptimum control of the airport system therefore representsthe most important component in the process of controlling airtraffic system.

The railway has advantages over other branches of longdistancetransportation from the ecological, economic, safety,and technological point of view.The paper gives an evaluation of the favourable influenceof railway traffic on the environment reflected in the rationalenergy consumption, significantly reduced need of physicalspace, and reduced air pollution.Having these data in mind, the railway is considered tohave a negligible influence on environmental pollution. However,studying even such small amounts plays a significant rolein the traffic safety and in the lives of people and nature itself

Today the modern production includes the following principles:liT (Just-in-Time), FMS (Flexible Manufacturing System),EOS (Economies of Scope), R&D (Research and Development),and increasingly present Lean Production.This article ana(vses how the mentioned principles, characteristicfor the production sphere, get integrated in the field oftraffic.

The introduction of intelligence into the telecommunicationnetwork of Croatia is becoming one of the key elements ofthe future development of the network. The paper describes there-organisation of the telecommunication network in Croatia,the process of creating and managing the intelligent services,the initial situation and the feasible plan of introducing the INconcepts. The paper is concluded with a list of IN services thatare being introduced in the initial phase of the Croatian telecommunicationnetwork.

Considering the fact that noise is mostly caused by the trafficflow with all its characteristics, and in the production systemby machines, devices, and tools, it is necessary to implementmeasures for its prevention.Noise has to be eliminated on humanitarian grounds, andthen also with the aim of greater productivity and efficiency.However, regardless of the fact that, according to the analyses,by reducing noise the efficiency is increased and the costs(both fued and variable) reduced, these should not be the onlyreasons for its elimination; it should also be in the function ofthe organisation of the work place. Led by a human, ratherthan economic tendency, full satisfaction, good health, andmost of all increase in the productivity will be achieved throughsafety and protection.

The paper analyses some fractures of vehicle componentswhich have caused traffic accidents. The methods of analysingthe cause of fracture have been described, as well as the maintypes of fractures. The first analysed cause of a fracture is the excessivelyrough machine finish which leaves cracks (stress concentrators),the starting points of crack propagation. The secondcause is unprofessionally per[01med welding which later inservice causes fracture at the weld. The third cause is the toohigh content of carbon in the material of the railway vehiclewheel rim. Dwing braking, the higher content of carbon causedformation of excessively hard (and brittle) martensite in thesurface layer of the rim.

More than 500 million bicycles have been estimated to participatenowadays in the modem road transport. Bicycles arethe most numerous vehicles in the underdeveloped countries,whereas in the developed countries they are more frequent(vused for recreation and sport. Sudden revival of bicycle transportin modem times is like(v to continue, at a higher or lowerrate depending on the particular conditions in a certain country.The reason for this lies in the fact that bicycle is popular inunderdeveloped countries because of its low cost, and in the developedcountries it is preferred to motor vehicles because of itsecological, sport, and medical and recreational aspect.The present slow development of cycling in Croatia, is theresult of the war and post-war events, but this is expected tochange towards rapid growth in free Croatia. This should beour tendency out of the same reasons which hold for the developedcountries with special emphasis on tourism and environmentalprotection. Therefore, schoolchildren should be acquaintedat schools with all the advantages of riding bicycles,they should learn how to ride a bike and all about the trafficrules. For normal bicycle traffic, an appropriate bicycle lanenetwork should be constructed as soon as possible, for urbanand suburban traffic, as well as bicycle lanes for recreationaland tourist purposes. Moreover, the conditions should be createdand cycling promoted with the sport and racing spirit, inwhich Croatia has always had a great and brilliant tradition.