: Professional signs use rust-proof aluminum, often with a 3M-approved laminate to protect against UV rays and graffiti.
Options range from 5 MPH to 55 MPH. A 15 MPH sign (18"x12") is available from RoadTrafficSigns.com for $25.86. Aluminum YIELD Sign (R1-2) Traffic Safety Warehouse Go to product viewer dialog for this item.
Official Street Signs, Flat-Blade 18 x 6" .080" Double Sided EG Reflective Aluminum Street Name Sign SafetySign.com Go to product viewer dialog for this item.
A standard 18"x6" double-sided reflective sign for $33.16 at SafetySign.com .
: Maximum visibility, 10x more reflective than standard materials.