What services are the Department of Transportation in charge of?

The US Department of Transportation establishes design and construction standards for the US and Interstate Highways and manages the Federal highway funding programs. The Department includes agencies like the Federal Aviation Administration and the National Highway Safety Administration, that regulate the safety of various forms of transportation, as well as investigate serious transportation incidents. Through the Pipeline and Hazardous Materials Safety Administration, the Department regulates natural gas and petroleum pipe lines and the transportation of hazardous materials by rail, highway, air and water, and harmonizes those regulations with international requirements.

Before the reorganization that followed the attacks of September 11, 2001, the Coast Guard was part of this Department during peacetime.