 Tide also runs the buses in northern Rogaland on contract with Kolumbus.The group has two daughter companies, Tide Buss AS that operates the scheduled busses, and the leisure travel company Tide Reiser AS that also operates express, airport and charter buses and chartered ferries and fast passenger craft.Formerly, Tide operated the passenger- and car ferry routes previously operated by HSD and Stavangerske, with the daughter company Tide Sjø.