BMW 3 Series outdoor campaign. 14m x 9m unipole sign on A1 Motorway (Bucuresti - Pitesti)
Large format advertising signs 14x9m bulletin board unipole sign
Mounting two 14 meters x 4 meters units on the same pole and having 1 meter vertical gap, makes 14m x (4 + 1 + 4)m = 14x9m = 56 sqm posting area. This way, 14x9m format offers a photo friendly format, while 14x4m (14'x48' bulletin board equivalent) is highly effective for large text based artworks.
As long as 14x4m Bulletin board is rather a text friendly format, 14x9m could be used for photo based advertising messages.
Advertising signs - billboard sizes