Our 17 year old daughter has a 19 year old boyfriend. Spring break is coming and they want to go somewhere together. Neither set of parents are able to take time off from work, but the 'kids' have their hearts set on going somewhere together. We tossed around some ideas (I wasn't serious) but to my surprise, they contacted 'grandpa' who lives in Florida who has agreed to let them visit him. We live in Illinois and they would drive! What is the law regarding a 17 year old girl traveling across multiple states with a 19 year old boy?