As efforts to renegotiate terms of the North American Free Trade Agreement shift from Ottawa to Washington, two trucking industry groups and the Teamsters union are taking aim at a provision in the current agreement that allows trucks from Mexico to operate in the United States.

The U.S. Treasury Department on Sept. 13 announced that active and retired Teamsters across upstate New York had voted against big pension reductions by better than a 2-1 ratio.

WASHINGTON — As autonomous technology evolves, drivers will remain integral to the movement of goods and services for the foreseeable future, top trucking executives told senators concerned about potential disruptions in the labor force.

Teamsters President James Hoffa has fired Sean O’Brien as the top negotiator on behalf of UPS Inc. and its UPS Freight employees after only six months, prompting the ousted director to write a blistering rebuke to the union leader.

More than a quarter of King County, Washington’s concrete delivery-truck drivers have gone on strike, and the rest could soon join them — threatening to delay dozens of projects amid the region’s record construction boom.

Labor unions are urging a slowdown as lawmakers fast-track legislation to allow self-driving vehicles on the road, a potential boon to some union jobs and an existential threat to others.

Secretary Steven Mnuchin met last week with 25 Teamsters retirees from groups in 15 states. They included Tom Schwarzenberger, who said the focus on possible solutions to the pension’s funding shortfall marked something of a milestone.

A battle to unionize is ongoing at Parsec Inc., a company that provides equipment and other services to those in the intermodal section, as the Teamsters won a second victory.

FedEx Freight workers in Charlotte, N.C., have reversed course and voted not to unionize.