 Any opponent could crash at any point during the race (although subject to various constraints noted below).If the "yellow flags" option is chosen from the "OPTIONS"/"REALISM" menu selection, yellow flags will be waved immediately and a period of driving at reduced speed with no on-track overtaking will commence.Pit-stops can still be made during caution periods, and indeed if a crash occurs close to a standard pit-stop "window", the majority of cars will usually take the opportunity to pit.