From 5am to 1am the bus and tram network around Oslo is in operation. Tickets purchased on trams and buses can be used interchangeably. Tram lines run every 10 minutes in the morning, and every 20 minutes at night. The main tram station is in Jernbanetorget, which is where the main bus and train lines can also be found.
Buses cover weekend nights and none of the day passes are valid at this time. Travelling weekend nights are therefore an expensive affair, costing 50NOK per ticket or more.