Post mounted signs are usually at the entrance of a business showcasing the brand, services and products of the company. A very visual stand alone solution.
The material depends on the location and the period of time you want the board to be installed. We would use either Correx for short-term impact, heavier foamex or even the more expensive dibond for long term board installations.
Pre-fabricated, wooden and metal signs are also available that can be branded using vinyl graphics.