Existing car-sharing schemes in Sweden and elsewhere have provided a norm for indicating what car-sharing, both generally and in Sweden in particular, represents. A more adequate definition, however, applying to car sharing in Sweden, appeared to be needed. Through providing such a definition, through suggesting appropriate quality requirements car-sharing should meet in order to receive public support, and through considering various questions of practical importance in this context, the Swedish National Road Administration hopes to contribute to a better understanding of car-sharing generally. Doing so also creates a more adequate basis for planning on the part of those who want.