<P> In the 2011 Canadian Grand Prix of Formula One, rain before the race wet the circuit . 30 minutes into the race, a heavy rainstorm hit the circuit and the race was red - flagged, the rain didn't stop and the event was delayed for more than 2 hours, the race was finished for its 70 laps and was the longest race in Formula One history . To prevent a repeat, FIA rules were changed so that a four - hour race clock starts when the cars start their warm - up lap . The clock will not be stopped for any situation, effectively ending a race four hours after cars roll off--regardless of how far the race has finished . </P> <P> The 2012 Daytona 500 was postponed by rain for the first time in history, as it was postponed 30 hours from 1 PM Sunday to 7 PM Monday . </P> <P> The 2013 6 Hours of Fuji in the FIA World Endurance Championship was effectively cancelled because of rain; officials started the clock and ran laps under caution, hoping for conditions to improve; after 17 laps, all under caution, the race was effectively cancelled, but under FIA rules, was an official race . To prevent a repeat, FIA rules were changed to state the three completed laps rule to make a race official applied only to green flag laps . </P> <P> The 2015 Petit Le Mans was shortened to 7 hours, 51 minutes after being under one weather delay earlier in the race; after a safety car with slightly over two hours remaining, the race was abandoned after 179 laps because of weather conditions related to Hurricane Joaquin and related heavy rains in the Southeastern United States . </P>

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