Our teenage son has been driving for a year now. He drives to school, drives to practices, and runs errands for us. Although he is a very skilled and safe driver, he has not had much highway experience. That’s why today was a test for me as we traveled to Portland and back, with him in the driver’s seat. I always thought I’d be that hip parent, the one who is as cool as a cucumber, the mom who doesn’t get worked up over every little thing that could possibly go wrong. Put simply, I was NOT going to be …