During the tragedy, nine people, three Danes, three Swedes, one German, one Australian, and one Dutchman, lost their lives when 50,000 people pushed forward towards the stage.
Since then, the festival has taken several safety measures and this year it is time for another one: An AI program that can read how close people are to each other and how they move.
It can count heads and shoulders and measure how fast people walk. And it can also read facial expressions and mood, says Roskilde Festival's security chief Morten Therkildsen to the news agency Ritzau.
Even though the technology is based on the festival guests' faces, it cannot recognize individuals.
It will not be able to say: "It's Morten walking there". But it can tell us that "people are walking slower now" or "people are upset," says Therkildsen.
It can also sound the alarm if someone falls and cannot get up again.
This year's festival will commemorate the 25th anniversary, among other things, with a screening of the film "Nine Rocks", which is about the accident.
