Businesses and individuals alike need to protect themselves as well as the people on their property by displaying appropriate signage.  Prohibitive signs can be used to keep trespassers off the premises, or restrict certain actions--such as skateboarding or bicycle riding.  Informative signs may be used to indicate rules and regulations as well as notify of surveillance cameras in the area.  Directional signs are used to clearly mark entrances and exits, or specify where deliveries can be made.