Before signing up with Free Car or Car Solution, there are a few requirements you have to meet :
1. You must be at least 18 years old and have a valid driver's license.
2. They only work with companies in the United States, Canada, UK, France and (only for Free Car) Spain. Unless you are living in one of these countries, joining the this program has no use.
3. You must have car insurance (and, of course, gas money).
4. You must, in no way, deteriorate the advertisement. If this happens, you must report it to the company that provided it and they will have it changed.
5. The advertising car must be your primary car (even if you own a second car).