According to an updated report by the Texas Transportation Research Institute (TTI), traffic congestion on U.S. highways has receded slightly over the past few years due to high fuel prices and the economic recession. But the group’s researchers don’t expect that trend to continue and thus are urging for continued investment in roadways.

“Travelers spent one hour less stuck in traffic in 2007 than they did the year before and wasted one gallon less gasoline than the year before – even before the current recession,” said TTI Researcher Tim Lomax. “The differences are small, but they represent a rare break in near-constant growth in traffic over 25 years.”

TTI Research David Schrank noted that the ongoing U.S. recession could prolong this effect, but warned that the slowdown in congestion growth will be temporary. When the economy rebounds, expect traffic problems to do the same, he said.

“This is a very small change,” Schrank pointed out. “No one should expect to be driving the speed limit on their way to work because of this. That's because the average traveler still needs 25% more time for those trips.”

The most current information on the nation's traffic picture is outlined in TTI’s 2009 Urban Mobility Report, which tracks a quarter century of traffic patterns in 439 U.S. urban areas from 1982 through 2007. Other highlights from the research illustrate the effects of the nation's traffic problems:

• The overall cost (based on wasted fuel and lost productivity) reached $87.2 billion in 2007 — more than $750 for every U.S. traveler.
• The total amount of wasted fuel topped 2.8 billion gallons — three weeks' worth of gas for every traveler.
• The amount of wasted time totaled 4.2 billion hours — nearly one full work week (or vacation week) for every traveler.

The American Trucking Associations (ATA) said that the economic costs of traffic congestion have increased 63% over the past decade. ATA noted that while public transportation could supplement highway capacity expansion on certain corridors in densely populated areas, highway improvements are the only viable, cost-effective solution to addressing congestion in the vast majority of communities.