This article considers electric cars as socio-technical experiments in meeting mobility requirements. There have been numerous trials and government incentives to promote such vehicles, but with a notable lack of success. The article thus seeks to address an urgent need to understand such “transition failure,” which may ultimately impact upon how progress is measured in sociotechnical transitions. Presenting results from a recent research project, it is suggested that shared usage models hold greater potential for achieving sustainable personal mobility. It is concluded, however, that multiple niche experiments present a highly complex situation in which cumulative learning is problematic.