With the exception of the mile run, races based on imperial distances are rarely run on the track anymore since most tracks have been converted from a quarter mile (402.3 m) to 400 m; almost all record keeping for imperial distances has been discontinued. However, the IAAF record book still includes the mile world record (currently held by Hicham El Guerrouj of Morocco for men and Svetlana Masterkova of Russia for women) because of its worldwide historic significance.