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Automated vehicles traveling in platoons must exhibit stability both individually and as a group, a property referred to as "string stability". We propose a new framework for evaluating the longitudinal string stability properties of platoons of automated vehicles. In this framework, the platoon is considered to be a mass-spring-damper system with linear characteristics. The resulting closed-loop representation yields transfer functions and impulse responses that can be analyzed to determine the string stability properties of the platoon. This framework facilitates qualitative comparisons of the effects of various controller characteristics, such as time headway and intervehicle communication, on string stability.

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APC structure, which were developed during the course of experimentation to solve specific implementation problems, are also presented.