Take the main road from Oslo and drive westwards, following the signs to Bergen. After around two hours and 135 kilometres, you reach Hallingdal. From there, follow Rv7 and enjoy the two-hour drive.
Roads (from Oslo): E18 - E16 - Rv7
Other main roads
The Hallingdal region is linked to the regions in the north, east and south via E16, E134, Fv13, Fv40, Fv51, Fv53 and Fv55. Fv13 has junctions to Fv7 at Granvin and to E16 at Voss. Be prepared for snow at mountain passes from as early as October