Fatto generale: 550 is the number of accidents per day that falling asleep while driving results in in the United States on average.
Fatto matematico: 550 is a pentagonal pyramidal number.
Trivia: 550 is the number of accidents per day that falling asleep while driving results in in the United States on average.
Data storica: July 3rd is the day in 1979 that U.S. President Jimmy Carter signs the first directive for secret aid to the opponents of the pro-Soviet regime in Kabul.