In this April 4, 2008 file photo, trucks file down Greenbrier Street as truckers rally against high fuel prices at the West Virginia state Capitol in Charleston, W.Va. Struggling with record diesel prices, the trucking industry's main trade group on Thursday, May 8, 2008, introduced a plan to reduce fuel consumption and emissions over the next decade mainly by having its members slow down. AP Photo logo AP Photo 20 months ago

In this April 4, 2008 file photo, trucks file down Greenbrier Street as truckers rally against high fuel prices at the West Virginia state Capitol in Charleston, W.Va. Struggling with record diesel prices, the trucking industry's main trade group on Thursday, May 8, 2008, introduced a plan to reduce fuel consumption and emissions over the next decade mainly by having its members slow down.