motorway vs velodrome

motorway

noun
  • A racetrack venue designated especially for the sport of auto racing. 

  • A highway with grade-separated crossings (rather than level crossings) and designed (and only permitted) for high-speed motor-traffic (in Europe motor vehicles with a higher speed limit than 40 km/h) running in two directions on one separate carriageway each 

velodrome

noun
  • An indoor arena, having an oval banked track for bicycle racing. 

How often have the words motorway and velodrome occurred in a corpus of books? (source: Google Ngram Viewer )