Sometimes parents see something that you might not realize, like the 16 miles might be taking on too much with your job, socializing, and other time commitments, worried you'd lose weight, maybe you are accident prone, and many other things they might not have come out and said. As long as they don't come on as totally unreasonable, you can try to keep an open dialog, reminding them that you are an adult now and would like to make some of your own decisions. Congratulations on your choice to further your education. Heck, you're young and have your whole life ahead of you. You can get your exercise maybe another way. Good luck. ??Get a job closer in for the summer?