File:Charlotte Route 4 shield.svg

This design was first posted by the city of Charlotte, North Carolina with no copyright notice in the late 1970s. It does not appear that a copyright was registered, so it was never copyrighted. The logo is a registered service mark though.

This specific SVG was created from Image:US DOT FHWA MUTCD SHS 2004 3-7 M1-6 450x450mm 00.svg and the city's Crown Logo Guidelines (as stated above, the logo is trademarked, but not copyrighted).