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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.

About 13,000 truckers intend to boycott Total Quality Logistics from June 28 through July 5 citing concerns over work conditions, the leader of a group representing the truckers told Transport Topics.

More than 2,000 truck drivers in Florida are threatening to go on a strike June 25 for possibly two weeks to protest work conditions, a spokesman for the group organizing the strike told Transport Topics.

Several hundred truck drivers at the Southern California ports of Los Angeles and Long Beach went on strike last week against four fleets, including two controlled by XPO Logistics, seeking recognition as company employees instead of contractors.

Truck drivers at the ports of Los Angeles and Long Beach continued a strike against four fleets, including two controlled by XPO Logistics, for a second day April 28.

Several hundred truck drivers at the ports of Los Angeles and Long Beach began a strike against four fleets, including two controlled by XPO Logistics, but there were no reports of interrupted cargo flow on the docks at the nation’s two largest ports.

The United Steelworkers, representing more than 30,000 U.S. oil workers, instructed members to reject a seventh labor contract offered by Royal Dutch Shell Plc as the biggest refinery strike since 1980 dragged on.

Truck drivers ended a strike at the ports of Los Angeles and Long Beach after five days, the Los Angeles Times reported.

Truckers at Port Metro Vancouver reached a deal to end a strike that began March 10, the Vancouver Sun reported.