Some union officials expressed confidence Tuesday that legislation in Congress would halt Mexican trucks from making long-haul trips into the U.S.
A $410 billion spending bill offered this week includes language that would bar Mexican-licensed trucks from traveling beyond commercial zones along the border with Mexico.
The wording is aimed at ending a pilot program backed by the Bush administration that permitted up to 500 U.S.-certified trucks access deep into the United States.
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The legislation was expected to clear the House this week, and the Senate could take it up next week.
The Bush administration said open U.S. roads to Mexican truckers was a necessary part of the North American Free Trade Agreement.
But critics say the program would eliminate U.S. jobs -- and that Mexican trucks weren't safe for U.S. highways.