I'm going to add some advice which you can feel free to completely ignoreabout the Halloween Fright Night issue and general college parenting.
STOP getting involved in these kinds of decisions!!!!!! Your daughter is not in high school anymore, when she needed your permission to do these kinds of things. STOP being involved at this level. Say "Sounds like fun! Be careful, you know I'm a mom and I worry!" if you must, but stay out of her decision making at this point.
Trust me, you will be so glad you did ultimately. If you are too nervous this time then force yourself to butt out and look at it as practice for yourself in the art of letting your college students grow up.
STOP being so worried about them driving, and if you can't stop then stop saying it out loud. They don't need their mom to be a ninny about road trips. Remember, I'm the mom whose daughter had car trouble during her 14 hour drive back to school and had to coast to the side of the road after her car lost power and was towed to a motel by the AAA guy. I would have LOVED the tire signal - we get that all the time and it's just a function of the weather changing.
Really, I mean this all kindly but you HAVE to stop being so involved in this kind of stuff. You aren't doing your students any favors by holding them back. And someone was right when they said they were lucky the students were telling their parents this kind of stuff anyway - most college kids don't ask permission to make their own plans.
Following this thread because my DD17 will be going 4 hours away next Fall. You all are helping me prepare!
This post made me comment. I have been here before with my DS28 and have to agree. In my experience, getting too involved in their decisions doesn't effect the decisions as much as it effects the information they share. Of course, that can be good too. Sometimes you just don't want to know!