 Along with Setesdal Bilruter it bought Høvågruta in 2002.It was in 2008 bought by Nettbuss Sør AS and incorporated into their fleet of companies.For a short while RTB operated an express busline between Kristiansand and Oslo called Miljøxpressen, 
but as this line was in direct competition with Nettbuss Sør AS's Sørlandsekspressen, it was closed down shortly after takeover.