“There is a Constitutional right to travel. It is an essential part of liberty.”
I agree.
Then on interstate and US highways the Commerce Clause could be used. Those closing down interstate and US highways are interfering with interstate commerce.
The FedGov uses the CC for everything else.
True, but there are also two other Constitutional uses I had in mind:
1) The implied right to travel anywhere as an essential part of liberty
2) Any motorist on any road being blocked could claim they were on their way to another state, a right expressly guaranteed in The Constitution.