Statistic of the Day: Subways

While the population of New York City is about 8.3 million, subway ridership on an average weekday is only about 5.2 million. And that number is probably card swipes, not individual riders -- many of us are riding twice a day.

According to New York City Transit, the biggest single day for the subway system was December 23, 1946 with about 7 million rides.

Source: The New York Times, Sunday, December 14, 2008.