Transportation Department says more than 550 driving schools must close over safety failures

More than 550 commercial driving schools in the U.S. that train truckers and bus drivers must close after investigators found they employed unqualified instructors, failed to adequately test students and had other safety issues, the federal Transportation Department announced Wednesday.

The move marks the Trump administration's latest effort to improve safety in the trucking industry. And unlike its actions last fall to decertify up to 7,500 schools that included many defunct operations, this latest step is focused on active schools inspectors identified as having significant shortcomings in 1,426 site visits completed in December...