It is illegal to empty toilets outdoors. Rest stops and emptying sites for toilets are marked on the Norway Camping map available from the Norwegian Tourist Board. Also marked on that map are the roads unsuitable for caravans. The many lay-bys along the roads are not meant for overnight stays. Parking overnight on the roadside is OK, though, if you are not in the way.
Some cities provide parking lots especially for motorhomes.
The NAF maintains emergency telephones along mountain roads and from June 16th to August 14th operates a 24-hour service that patrols main roads and passes, tel. To find out your nearest emergency pick up service contact Viking Redningstjeneste, tel. N-0255 Oslo, tel. If you must use a telephone directory, look under redningstjeneste.