Abstract
Quality demands imposed to transportation by beneficiaries might be reached in the situation that the transport means that get obsolete with time, are replaced with others to satisfy the need for mobility addressed to the system. Establishing the moment of transport means replacement is an economic equilibrium problem. As time passes, obsolescence arises and maintenance and operating costs rise. They increase until they exceed the acquisition cost of a new vehicle. The research methodology consists in establishing the most appropriate maintenance and operating costs evolution function so that, by finding its minimum and considering the costs of acquiring a new transport vehicle to determine the minimum value of both cost categories. To take into account real situations, calculation encloses an updated value of costs in time. The theoretical considerations are supported by a case study where the economic moment of replacing a transport vehicle is determined for both cases, with and without updating.
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