The safety measures that Ford Motor Co. has spent weeks preparing to resume North American production fell short of assuaging the United Auto Workers union, which could stand in the way of much of the industry’s plans to reopen.

Ford briefed reporters Thursday on how it will require face masks, check temperatures and close cafeterias at factories across the continent when it restarts operations at an untold date. UAW President Rory Gamble said the union is still talking with the company about its protocols.

"The UAW is asking for as much testing as is possible to prevent exposure to the virus,” Gamble said in a statement. While the availability and accuracy of tests are "fluid,” he said, the union wants as much of them deployed as possible.