Not all tunnels in norway are allowed for biking-tourists.
Find out more on http://www.visveg.no.
Click at "Vegfagdata" and "Sykkel tunneler".
Those allowed are marked green, not allowed are marked red.

The North Sea Cycle Route, Rogaland | The Telemark canal | Rallarvegen | The Coastal Route | Lofoten | The Numedal Cycleroute | The Hallingdalen Route | The Discovery Trail | The region of Røros | Vesterålen | Island hopping in Møre & Romsdal | Voss - Bergen | Setesdalen | Sunnhordland | Helgeland