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Christie Whitman submitted her resignation on Tuesday to President Bush as administrator of the Environmental Protection Agency.

Authorities stepped up scrutiny at cargo ports and border crossings across the country after the national terror alert level was raised to orange on Tuesday afternoon, the second-highest level.

Trucker Was Told He Was Carrying Explosives • Ridge: Checks of Airport Screeners Will Be Completed • Port Security Funds May Be Shifted • Government Tests Air Mail Plan • And more...

WASHINGTON — Transportation companies do not yet realize how much new security requirements are going to cost them, a senior Democratic staff member on the Senate Commerce, Science and Transportation Committee said last week.

Tank truck carrier executives said they were being deluged with requests from shippers to sign contracts in which they assume all liability for accidents and mishaps even if the shipper is at fault.

Washington State Motor Fuel Tax to Increase July 1 • DHL Airways CEO to Purchase Outstanding Shares • Greenspan Says U.S. Economy Poised to Grow • U.S. Temporarily Bans Canadian Beef Imports • And more...

The average price of diesel fuel fell 0.1 cent to $1.443 per gallon, the 10th straight week commercial trucking’s dominant fuel has declined, the U.S. Department of Energy reported Monday.

NEW YORK — Even as the trucking industry continues to evaluate new diesel engines that hit the market in October, fleet officials expressed concerns about federally mandated emissions levels that Class 8 engines must meet in 2007.

NEW YORK — Top officials of several national truckload and less-than-truckload carriers said they would avoid adding cargo capacity this year because of flat freight volumes and few signs that the economy is growing.

The Bush administration on Tuesday raised the national terror alert level to orange or "high," from yellow or "elevated," as intelligence reports suggested domestic terrorist attacks were possible, news services reported.