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.

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.

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.

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.