This paper presents a global analysis of the key factors that could de
termine the scope of technological innovation in the automotive indust
ry. It argues that most social, economic, industrial and technical fea
tures of this industry play against any radical innovation such as, fo
r example, the electric vehicle. It emphasises the 'blocking' role of
heavy capital investment, massive employment, infrastructure, consumer
s' constraints, etc. It contributes to the theoretical debate an techn
ological inertia.