When it comes to business, the more familiar your name is, the more likely people are to buy from you. While advertising on TV, newspapers and radio can be effective, it is often expensive, especially considering the ongoing costs.
There are more people on the road than ever before. People drive almost anywhere. While traditional forms of advertising such as radio commercials and billboards are proven to be effective, drivers cannot look at billboards because they need to keep their eyes on the road and the cars around them and everyone switches the radio station when a commercial comes on. However, car ads bring the advertisement right to the level of the drivers. You can't help but notice a brightly colored magnet on a car driving beside you or front of you. People will see your business advertised on average from 5 seconds to as many as 5 minutes if you continue to follow a car. This allows for greater exposure of the advertisement to the consumers and can engrave the image of the advertisement because it is seen for so long. The car also allows for more lines of sight then traditional outdoor mediums. Most billboards can only be see from one direction, however a brightly colored magnet can be seen from all sides, front, back, drivers side. This medium is also the cheapest of all forms of outdoor mediums in terms of CPT (cost per thousand). Per: New York Times