We investigate how to obtain a balance between privacy and audit requirements in vehicular networks. Challenging the current trend of relying on asymmetric primitives within VANETs, our investigation is a feasibility study of the use of symmetric primitives, resulting in some efficiency improvements of potential value. More specifically, we develop a realistic trust model, and an architecture that supports our solution. In order to ascertain that most users will not find it meaningful to

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... ect or disable transponders, we design our solution with several types of user incentives as part of the structure. Examples of resulting features include anonymous toll collection; improved emergency response; and personalized and route-dependent traffic information.