It is most likely correct to say that the success of an advertisement in the space where it is displayed is not just up to the quantity of targeted group of potential customers but also the amount of time they spend. Public transportation is probably the best advertising medium as it well captures both qualities, i.e. a great number of users per day and a rapid turnover. As an adaptation to high competition, contemporary advertising tends to be more customised and contextual in the battle for public’s attention. More and more of public spaces are being commercialised.
