Well, at my house when I was 18, it didn't matter that I was old
enough to make my own decisions, as I was supposed to be old enough to
understand that walking in at 3 a.m. was also disruptive to the other
members of the household, so respecting that fact was also a part of
learning responsibility and respect for others. If I wound up spending
the night with a friend, so be it, as long as my parents knew it was
an unplanned possibility ("i.e. Hey mom, I might spend the night at
Cindi's," so they didn't worry their heads off that I had been left
for dead in a ditch.

Are you talking about 3 a.m. as in waking people up, or 3 a.m. as in people
worrying? �Simple care addresses the first concern, a cell phone and a set of
rules about putting in calls addresses the second. �Neither needs a curfew.

Ah, right. The car pulling into the driveway, slamming car doors, car
alarm settings, creaky stairs, etc. won't wake anyone up ever? Some
people are light sleepers or have a hard time getting back to sleep
with either approach, especially when they hear someone sneaking
through their house. They are more than likely to wake and see that
these noises are occurring at the set curfew time and be able to be
relaxed and nonjarred enough to fall back asleep however. It is my
opinion that if a parent has a problem with any of these things, then
they have the right to continue to enforce reasonable curfews.
Obviously we disagree.