WASHINGTON – A government auditor says more work is needed to ensure the safety of Mexican trucks and buses awaiting permission to drive on U.S. roadways. The U.S. Transportation Department's inspector general's office made public its latest report on Mexican truck and bus safety Tuesday. The audit says some states are not consistently reporting traffic convictions of people driving in the U.S. with Mexican drivers' licenses. Also, bus inspections are not being done, are done infrequently or have other problems.