General fact: 55 is the highest speed limit allowed in the United States between 1974 and 1986 per the National Maximum Speed Law.
Mathematical fact: 55 is the interesting property that it is the 10th Fibonacci number and the sum of the numbers 1 to 10.
Trivia: 55 is the number of Delegates who attended the United States Constitutional Convention in 1787.
Historical date: February 24th is the day in 1809 that London's Drury Lane Theatre burns to the ground, leaving owner Richard Brinsley Sheridan destitute.