Some of the ethical implications of the involvement of transportation analysts in politically oriented planning processes, particularly in the context of urban transportation planning, are examined. The major point of departure is the concept of fragmentation of intellectual perspectives, which manifests itself among participants in the planning process, both professional and nonprofessional, and within the individual, who plays a variety of socially recognized roles. The pattern of congruences and conflicts created by the roles of professional transportation analyst, organization member, and participant in the political process is seen as the key to ethics for transportation analysts. Obligations imposed by each of these roles are identified and compared. The major conclusion is that these roles are, for the most part, congruent provided two key points are accepted:(a) that technical competence for transportation analysts consists of mastery of a variety of disciplinary perspectives and (b) that the professional's primary loyalty as a participant in the political process must be to the process itself and not to particular substantive outcomes./Author/