 During the night, racers use lighting systems to negotiate the course.24 Hours of Adrenalin held their last world solo 24 hour championships in 2010 and there was no world solo 24 hour championships in 2011.A new organisation WEMBO was founded to continue solo 24 hour mountain biking at world level and WEMBO have held both continental and world solo 24 hour mountain bike championships since 2012.