The shorter the message the larger the print, the easier the advert will be to read for your customers.

 

As you are advertising on several cars try and think up a car gimmick for your company.  For example: Get people to spot your adverts with the registration of the cars.  Then bring the answer to your premises for a discount.  

 

Make up a company car mascot that kids will like to see.  There is nothing like kids trying to spot things in a car to get the parents attention.

 

Put a different message on each car or a sentence that can be made up by spotting all of your adverts. Offer discount if people can find them all.

 

Make sure you have key details on the advert. Web site phone number, company logo etc