The Targa's international demise was compounded because of widespread concern about the organizers' ability to properly maintain the race on such a massive circuit, and there were not enough marshals - most spectators sat too close the roads; and also the international automotive governing body, the FIA, mandated safety walls on all circuits that were going to hold FIA-mandated events from 1974 onwards, and the 44 miles length of combined public roads made this simply impossible and totally impractical, especially from a financial standpoint.