The crossword question ‘Autobahn abbr. is KPH‘ is asking for an abbreviation that is commonly used on the German Autobahn to indicate the speed limit. The answer to this question is ‘KPH‘, which stands for kilometers per hour. The Autobahn, a system of high-speed motorways in Germany, is known for its lack of speed limits in many areas. However, there are certain areas where speed limits are in place and are denoted by signs displaying the speed limit in kilometers per hour. Therefore, the abbreviation ‘KPH‘ is commonly used on the Autobahn to indicate the maximum speed limit allowed in those areas.