Americans drove more than 100 billion fewer miles between November 2007 and October 2008 than the same period a year earlier, said U.S. Transportation Secretary Mary E. Peters, making it the largest continuous decline in American driving in history.

"As driving decreases and vehicle fuel efficiency continues to improve, the long term viability of the Highway Trust Fund grows weaker...The way we finance America's transportation network must also change to address this new reality, because banking on the gas tax is no longer a sustainable option," said Secretary Peters.

The Secretary noted that Americans drove 3.5 percent less, or 8.9 billion fewer vehicle miles traveled (VMT), in October 2008 than October 2007, making it the sharpest decline of any October since 1971.

To review the VMT data in FHWA's "Traffic Volume Trends" reports, including that of October 2008, visit http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.htm.