Shelters are backlit, providing 24-hour visibility to pedestrian and vehicular traffic. They are often located in areas that restrict other forms of OOH media enabling advetisers with coverage that would otherwise not be available.
They are often purchased to target the particular metropolitan district in which they are located. Individually they have value, but collectively along a street or bus route, their value is greater than the sum any single units.
Their magazine-quality production makes them particularily attractive not only for general coverage, but ethnic or micro-marketing. Often bought with other OOH media they are also purchased to raise awareness of alternative media including Radio and TV.