Carless days was a petrol demand reduction scheme active in New Zealand from July 1979 to May 1980.[1] Introduced by the Third National Government of New Zealand, during the 1979 oil crisis, the scheme prohibited owners of private petrol-powered vehicles to drive on a self-designated day of the week. The enabling regulations were one of several attempts to help the New Zealand economy after the oil shocks of the late 1970s—other such policies included the Think Big strategy.