Anyone and I mean anyone with a teenager should go to this site and pick up iTrail. Don't tell the kids, just put it in their car or better yet, a small pocket of their backpack. You can track them anywhere and make sure they are not getting into trouble. You don't want to be the parent of a teen the ends up missing or worse. Nice to see that your kids really are telling you the truth now and then. GPS was meant for this. You can also make sure they are not speeding too.