Article 1, Section 8:
The Congress shall have the power...
to regulate commerce... among the several state;
to establish post offices and post roads;
"Regulate commerce" has been interpreted to mean either to control interstate commerce or to keep it regular. I think the latter interpretation is correct and consistent with the writings of the founders. So keeping interstate commerce regular means building interstate highways. Then there's also the power to establish "post roads", that's just a road built for the purpose of transporting post. So I do think the Department of Transport is one of the only ones that actually is constitutional. Though that's not to say it couldn't be reduced in size and scope.
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The Department of Transportation increases spending on highway repairs.
department of transportation
The Department of Transportation through the Federal Highway Administration
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.
The US Department of State issues US passports!