The aim of the article is to compare the operational efficiency of the city buses in various stages of their operational life. Technical
readiness tests, repair costs and revenues during the six years of operation were conducted using two popular bus makes as an
example (domestic and imported). Based on these tests, the characteristics of the operational efficiency of buses was determined.
It has been shown that the service life has a significant effect on the operational efficiency. The division of the total operational
period of the vehicle into the warranty and post-warranty period was considered and a new division was introduced, of the „period
of full operational usefulness” and “period of limited operational usefulness”. This new division of service life into stages makes it
possible to determine the most reasonable limit of the vehicle usage until it is taken out of service. It can also be used when choosing a vehicle make as part of a fleet renewal or extension program.
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