Nikkalite" Engineering Grade (EG) is a beaded technology material designed for use on non-critical traffic signs and is highly resistant against the extremes of hot, cold, dry and humid weathering conditions. Meets ASTM D4956 Type I specifications.
I like Nikkalite for small town street name signs. The only problem I can see with it is that it's cold sensitive eg: When it is cold it tends to tear and not weed well. Even just a little cold.