Vehicle to Vehicle communication (V2V) and Vehicle to Infrastructure communication (V2I) promise to improve road safety and optimize road traffic through cooperative systems applications. A prerequisite for the successful deployment of vehicular communications is to make them secure. The specific operational environment (moving vehicles, sporadic connectivity, etc. ) makes the problem very novel and challenging. Because of the challenges, a research and development road map is needed. We consider SEVECOM [1] to be the first phase of a longer term undertaking. In this first phase, we aim to define a consistent and future-proof solution to the problem of V2V/V2I security. SEVECOM will focus on communications specific to road traffic. This includes messages related to traffic information, anonymous safety-related messages, and liability related messages.