Anything permanently outdoors needs a rigid weatherproof substrate rather than a sticker on a wall, and a mechanical fixing rather than adhesive, which lets go through a summer and a wet season. Reflectivity matters where the sign must read at night under headlights. Post-mounted signs need clearance so a vehicle does not clip them. See safety signs, signboards and sign stands.

Street signs and display boards shown outside a commercial facility for directions, safety messages and site communication.
Street Signs for Safety and Direction

Shop street signs for car parks, facilities, worksites and public areas. Improve direction, identification and safety communication.