Intellectual Property Law
Intellectual Property Law Questions? Ask a Lawyer
Yes you can use most signs. Most public road signs are in the public domain. There can be exceptions such as the Interstate shield, which is copyrighted by American Association of State Highway and Transportation Officials.
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The sign I am specifically thinking of is the kind you see in Europe that shows you when you arrive in a village and when you leave a village, they have a red diagonal line thru it. with the "name" of the village.
The red diagonal line through just about anything is public these days. If someone designs a custom sign that has a red line that may be protected. If you just want to use the red line across a name you choose that is probably not going to be a problem.
Would I be able to trademark or service mark a road sign I put on a T shirt
No, they are in the public domain.