Due to safety issues such as aquaplaning, the race is not held in wet conditions. In the event of a rain delay, the race will be postponed until rain showers cease, and the track is sufficiently dried. If rain falls during the race, officials can end the race and declare the results official if more than half of the scheduled distance (i.e., 101 laps) has been completed. The Indianapolis 500, as well as other IndyCar Series races, does not utilize the green–white–checker finish in case of a late-race yellow. The race can be (and in the past has been) finished under caution. However, officials may call for a late-race red flag to ensure a green-flag finish, an option that was used in 2014 and 2019. The circuit lacks lights, therefore lateness can become a factor in the cases of lengthy delays.