Billboard is the common term used to describe a type of outdoor advertising[advertising?:advertising material cutting machine] found along major highways.
Billboard is most frequently given to large steel-framed signs, which are mounted on poles 20-100 ft (6.1-30.5 m) above the ground. Most often, the sign is printed on large poster sheets, which are affixed to the face of the sign. These billboard signs may also be equipped with a variety of special lighting and display effects. This type of billboard sign is one component of a unique advertising medium that communicates to audiences on the go.As recently as 25 years ago, 90% of outdoor advertising consisted of billboards. Today, the industry has expanded to include smaller billboard signs on bus shelters, kiosks, and malls. There are over 500 companies nationwide that specialize in this type of advertising-billboard.
