Hmm I know it's not the same but I see a lot of people fall asleep on public transit only to be jolted awake, look around confused for a few seconds and then bolt for the doors because they are realizing they're about to miss their stop. I think it's great to say "you can't go to sleep" but I have a feeling people will fall asleep anyways, especially commuting to and from work. Based on the disoriented, panicked, suddenly awake people I see on public transit, I think the 10 second warning could scare somebody awake, have them panic and cause an accident.
