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.
Zahir Shah’s reign was a golden time in Afghanistan’s recent history. I do not recognize your description of Afghanistan or Zahir Shah.
” 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.