Final answer:
The greatest advantage of a Parent-teen driving agreement is that it increases communication between parents and teens.
Step-by-step explanation:
The greatest advantage of a Parent-teen driving agreement is that it increases communication between parents and teens. This agreement sets clear expectations and guidelines for both parties involved, allowing for open and consistent communication about driving rules, responsibilities, and consequences. By discussing and agreeing upon these aspects, parents and teens can develop a mutual understanding and strengthen their relationship.