High schoolers who make overnight visits to colleges they are considering are engaging in potentially dangerous or illegal behavior, according to a survey released Tuesday by the Center for Adolescent Research and Education at Susquehanna University and the group Students Against Destructive Decisions. A survey of more than 1,000 teens who said they had been on an overnight college visit found that:

• 16 percent reported drinking alcohol on the visit.
• 17 percent had sex or engaged in "intimate sexual behavior" during the trip.
• 5 percent reported using drugs other than alcohol.
• 2 percent drove while impaired.