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Fac ulty of Trans port and Traf fic En gi neer ing, Uni ver sity of Bel grade, Bel grade, Ser bia Orig i nal sci en tific pa per Trans port rep re sents an in dus try sec tor with in tense en ergy con sump tion, the road trans port sec tor within is the dom i nant subsector. The ob jec tive of the re search presented in this pa per is in de fin ing the ac tiv i ties which ap plied within road freight trans port com pa nies con trib ute to en hanc ing ve hi cles' en ergy ef fi ciency. Ve hi cle fleet op er a tion man age ment pro cess ef fects on fuel con sump tion de crease have been looked into. Op er a tion pa ram e ters that in flu ence ve hi cle fuel con sump tion were ana lysed. In this sense, a sur vey has been real ised in or der to eval u ate the vehi cle load fac tor im pact on the spe cific fuel con sump tion. Mea sures for en hanc ing ve hi cle's lo gis tics ef fi ciency have been de fined. As a tool for those mea sures' im plemen ta tion an al go rithm for ve hi cle fleet op er a tion man age ment was de vel oped which rep re sented a ba sis for a ded i cated soft ware pack age de vel op ment for ve hicle dis patch ing pro cess de ci sion sup port. A set of mea sures has been rec om mended and their ef fects in fuel sav ings were eval u ated. Vujanovi}, D., et al.: Energy Efficiency as a Criterion in the Vehicle Fleet .

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Transportation companies receive a great number of requests every day from clients wanting to send goods to different destinations. Their fleets often consist of several different types of vehicles. Dispatchers assign vehicles to transportation requests relying primarily on their experience and intuition. When assigning a certain type of vehicle to a transportation request, the dispatcher must bear in mind a large number of different factors. This paper considers the vehicle assignment problem when vehicle dispatching is done "today for tomorrow". The paper develops a model based on fuzzy logic that assigns different types of vehicles to planned transportation tasks. The model is tested on a real numerical example. The results of testing the model indicate that it outperforms the work of an experienced dispatcher.