” Since there were less then five hundred vehicles in Afghanistan in total and only one in the South, at Kandahar (a Chevrolet), then this was not a big problem.”
That’s because the economy was crap, and he and his family kept all the wealth and had all the cars. Think of how little development there was in the country such that it only had 500 cars! That makes things worse not better.
Afghanistan was/is an agricultural economy exporting fruits and wool. That is all there is. The land upon which Afghanistan sits does not have any of the requirements for industrialization nor any natural resources (oil, coal, metal ores) to exploit. Social structures in rural areas were feudal. When these were destroyed ("reformed") by the Communists (and by Revolutionary Marxist Islam from Iran), agricultural production ceased and the land was de-populated. So much for "reforms".