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Inter vehicle communication (IVC) has become a major topic during the last few years. Within the FleetNet project a novel mobile ad hoc network has been developed - based on the UMTS terrestrial radio access time division duplex (UTRA TDD) air interface - to interconnect vehicles and vehicles with roadside gateways via a mobile Internet. This paper focuses on the possibilities of reservation conflicts in the proposed protocol exploring multiple frequency channels, and outlines the impact on transmission delay and protocol efficiency. Intelligent algorithms to avoid these conflicts are proposed and are evaluated by means of simulations.