We make all our signs from .080” thick aluminum. Other companies use steel which rusts, plastic which cracks or warps, or a thinner gauge aluminum (.060 or .040) which bends or buckles.
We use 3M reflective sheeting and 3M UV resistant inks.
3M offers the following on their sheeting:
Signs are available in the following color options: Blue/White for Interstate Routes, Black/White for U.S. or State Routes, Blue/Yellow for County Routes.