This document outlines classes of attacks in vehicular ad-hoc networks (VANETs) and proposes a solution. It identifies five classes of attacks (network, application, monitoring, social, and timing) that threaten VANET security and safety applications. The document proposes implementing a trusted computing based solution using a trusted security module to promote trust among vehicles, infrastructure, and road users. This would help mitigate the identified attack classes and better protect transport users.