The applications of the second generation of new technologies in the continuously changing transport sector are multiplied everyday, without always producing the desired results.  In this research, on the basis of the analysis from the operation of successful and unsuccessful information systems in the transport sector, the identification of a number of determinant factors for the successful linking of information and transport systems is attempted.  More precisely, a series of basic principles for the operation of transport information systems are proposed and the crucial factors concerning strategic planning, systems and operations organisation, technology development and management of the transport and information systems users’ role are analysed.  The balance between information system and structure of the company offering transport services seems to be today the most important factor for the supply of the desired services to the user.