Letters and signs are a common artistic flare on many DOT, local, and even commercial projects. One of the main benefits to using form liner to create this look is that it allows us to detail the tool so that it can be easily dropped into and cast in a form. No dealing with numerous Styrofoam pieces, no aligning and centering in the form, and if you want, no dealing with individual letters.
Additionally, like the Lake Elsinore sign below, one of the advantages of making a sign as a liner is that the lettering can be cut through a texture pattern. Using this technique, letter panels can blend in with the wall pattern texture which gives the sign the striking look of a watermark in concrete.
Spec Formliners, Inc., likes to make sign-making easy.