WASHINGTON, D.C. – A coalition of groups led by Public Citizen the Teamsters Union have filed suit against the Federal Motor Carrier Safety Administration to block the federal government’s plan to allow a pilot program of Mexican trucks into the United States, according to Transport Topics. The suit was filed in U.S. District Court in California.

Also joining Public Citizen — which had been a lead and successful plaintiff in challenging FMCSA hours-of-service safety rules — were the Sierra Club, Environmental Law Foundation, a local truck drivers’ union branch, and the Owner-Operator Independent Drivers Association.

FMCSA is an agency of the Department of Transportation, which announced the plan in late-February to select Mexican trucking companies to perform long-haul operations across the U.S. border beyond the current commercial zone near the border. DOT Secretary Mary Peters said at the time that FMCSA safety inspectors would travel to Mexico as part of the pilot program. The department said last month that the program would involve less than 1,000 trucks, according to Transport Topics.