Travel planning is provided for a plurality of individuals vying for the use of shared transportation vehicles. A set of travel event requests for the plurality of individuals are accessed as are a set of travel preferences for the plurality of individuals and the travel event requests. Schedules are generated that specify the use of the shared transportation vehicles and that are based upon the set of travel event requests and a tradeoff factor that is derived from scheduling compromises relative to the set of travel preferences. Conflicts are identified, within the schedule and relative to at least one of the shared transportation vehicles, and then presented to at least two individuals. A conflict decision is received from the at least two individuals and the tradeoff factor is modified based upon the conflict decision. The schedule is updated based upon the conflict decision and the tradeoff factor as modified.