Weird vehicle, see it on Flickr
Description by Andreas Koningsdorff :
This is a very old (1960's/1970's) East German or Czechoslovakian (can't be sure nowadays), morotised car for invalids. They were never very popular due to the comfort level... or rather its lack. :-) I didn't think you'd find any in use in Poland. There are seats for 2 and fabric "door" and roof. In Poland they were registered as mopeds and had green number plates with white codes. The driver did not need to use legs/feet to drive it.
