Secretary of Transportation Elaine Chao / by Justin Merriman

Secretary of Transportation Elaine Chao poses for a portrait at the University of Michigan's North Campus' MCity, a full-scale simulated city test course for autonomous vehicles, on Tuesday, Sept. 12, 2017 in Ann Arbor, Michigan. 

Secretary of Transportation Elaine Chao speaks with people at the University of Michigan's North Campus' MCity, a full-scale simulated city test course for autonomous vehicles, on Tuesday, Sept. 12, 2017 in Ann Arbor, Michigan. 

A computer screen shows software that allows an autonomous vehicle to travel a road course at University of Michigan's North Campus' MCity on Tuesday, Sept. 12, 2017 in Ann Arbor, Michigan. 

Secretary of Transportation Elaine Chao speaks at the University of Michigan's North Campus' MCity, a full-scale simulated city test course for autonomous vehicles, on Tuesday, Sept. 12, 2017 in Ann Arbor, Michigan. 

Secretary of Transportation Elaine Chao visits the University of Michigan's North Campus' MCity, a full-scale simulated city test course for autonomous vehicles, on Tuesday, Sept. 12, 2017 in Ann Arbor, Michigan.  Read more about the secretary's visit at the Washington Examiner.