This story appears in the Aug. 4 print edition of Transport Topics.

Anne Ferro, who oversaw a period of voluminous rulemaking for the trucking industry, has announced her resignation as head of the Federal Motor Carrier Safety Administration.

During Ferro’s five-year tenure, the longest in FMCSA history, nary a sliver of trucking, from drivers’ hours to in-cab technology to drug and alcohol testing, was left untouched.

“Together, we have made a difference for countless families across the country by raising the bar for safety in motor carrier operations,” she wrote in a July 25 letter to her staff.

Ferro’s last day will be Aug. 15. She will become president of the American Association of Motor Vehicle Administrators.

Even as she came under fire and FMCSA faced lawsuits over rulemakings, Ferro defended the agency’s handiwork.

“I am not hired to help the industry,” she said at a House hearing in March over changes to the 34-hour restart provision in the new hours-of-service rule. “I’m hired to ensure the safety of the traveling public and to improve the safety of the operations of trucks and buses.”

When Obama nominated Ferro, safety advocates questioned her ties to the trucking industry. In the end, however, trucking and its allies in Congress became some of her fiercest critics.