Just replacing existing sign faces was the choice for Pima County where there was a logo change. Graphic Impact chose translucent vinyl since the design is a simple one. For more intricate full color projects, most likely we would have chosen digital imaging using the right concentration of inks so the light would show through. If this was an opaque sign box, either Aluminum or E-Panel would have been chosen.
Many time it depends on location and whether it in an area where vandalism has occurred.