Teenagers are being urged to avoid sex on roundabouts.
Getting busy while driving around rotaries is one of the crazes Norway's 18 and 19-year-olds engage in every year.
Car crashes and fatalities have multiplied during Norway's post-graduation period called "Russ."
There's also usually lots of drinking and nudity, as young adults test their newfound freedom.
The official warnings come from the country's Public Roads Administration as a way of promoting better safety.