A survey by megabus.com found that 92 percent of the sites customers chose bus travel over other forms of transportation to save money. An ongoing increase in the popularity of bus travel has helped megabus.com to recently serve its four millionth customer.

After launching the first intercity bus service with fares as low as $1 in April 2006, it took two years for megabus.com to reach one million customers. However, with the decline of the economy, megabus.com's introduction of double-decker buses and service expanded to 28 cities, the company sold its most recent one million tickets in only five months.

Additionally, 83 percent of those surveyed say the low fares have allowed for them to travel more frequently.

"Megabus.com's service allows people the chance to vacation, visit family and friends or travel to business meetings without worrying about the cost," said Dale Moser, president/COO of megabus.com. "The rapid increase in our ticket sales and our quick climb to four million customers is clear evidence that travelers are and will continue to look for more affordable travel options."

Among the 92 percent who use megabus.com instead of other forms of transportation, 67 percent use megabus.com instead of driving themselves, 43 percent take the bus instead of the train and 33 percent take the bus instead of flying, the survey found.

An online survey of megabus.com customers was conducted by Hanser & Associates from Oct. 12 to Nov. 3 and had 1,058 respondents resulting in a three percent margin of error, plus or minus.