In the world of Mass Media, anything that portrays any message is considered as channel. For example, the panel vans wrapped with a business name, colorful logo and big phone numbers are advertising vehicles.
These advertising vehicles do wonders to make products and companies viral. This is not the traditional way of advertising but it has power to get more reach as compare to any other form of advertisement.
We do not usually read newspapers or magazines and we do not even bother to see what is inside because mostly, advertisement related stuff is published on the inner pages of newspaper not on the front.
What these advertising vehicles do? They catch our attention by being super huge and colorful and the innovative slogans or appealing offers written on them make us feel like we are missing something. In other words FOMO is established though such advertisement and that is a psychological approach to get human attention.