Elaine Chao, a former top U.S. labor official, was sworn in on Tuesday to lead the U.S. Transportation Department, which overseas aviation, vehicle, train and pipeline safety.
Chao, a former U.S. labor secretary and deputy transportation secretary, took office hours after the U.S. Senate voted 93 to 6 to confirm her.
Chao, 63, will face key decisions on how to regulate the growing use of drones and automakers' plans to offer self-driving cars.