School leavers party for weeks on midnight buses, and Norway says it's gone too far

After 13 years of school, Selma Jenvin-Steinsvag and her classmate Aksel were running to catch the Oslo metro in red overalls. "After that all our written exams will be done," said Selma, 18.

The sight of school-leavers, known here as russe, walking around in colourful overalls is something of a coming-of-age tradition that brightens up the weeks before Norway's national day on 17 May.

That marks the day the russe can finally relax after their exams and have one final party. But for increasing numbers of young Norwegians, the parties have been starting weeks earlier, well before their exams have finished.

And there is one side to the celebrations that has increasingly alarmed parents and politicians alike - the russebuss.

"It's a party bus! We go out every night for a month, we get drunk, we're partying with our friends and it's just fun!" says 19-year-old Edvard Aanestad, who is finishing school on the west side of Oslo.

The fear is that all the weeks of partying as well as the peer pressure involved are having a detrimental effect on teenagers' overall wellbeing, as well as their grades.

A small fortune is often spent renting the buses and decking them out and many school-leavers go into debt to pay for it all.

"A russebuss drives all night from around midnight until early morning. We play really, really loud music and party all night," says Edvard's friend, Henrik Wathne, who's 18.

Alongside all the fun, there have been complaints that the celebrations result in heavy drinking, drug use and little sleep. There are also concerns that many teenagers feel left out because they cannot afford the cost.

And all of it currently coincides with the exam period.

Prime Minister Jonas Gahr Store said last year that he too had enjoyed his graduation, but the party bus culture had spun out of control.

His intervention followed years of public debate, with objections from authorities as well as many of the school-leavers and their parents.

"We are worried about some negative trends in our schools and neighbourhoods, and within Norwegian youth culture in general," says Solveig Haukenes Aase, whose eldest child is graduating this year.

Her two younger children are yet to start high school and she complains that the culture affects younger teenagers too: "In recent years, it has also started to have an impact on middle school kids."

Together with other parents she formed a group aimed at making the environment for young people safer.

"The attitude of school authorities previously was that it's a private matter, that the russe celebration is something that happens in your spare time," she told the BBC.

"But there has been a change in mentality among teachers, principals and school authorities, and it's now widely acknowledged that the new russe culture has a huge impact on the school environment.