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 Oslo (Rygge) is an airport located about 75 km South of Oslo, on the [[E6]] direction [[Göteborg]]. To reach Oslo via HH, you simple need a sign for Oslo and you can either hitch from the airport or walk about 1.5 km to (North direction, along the motorway) the Rygge on-ramp where local traffic passes at the roundabout. The first petrol station is a few kilometres North, around Moss. From there it's rather easy to get a direct ride to Oslo.

Or you can just stand at the end of the car park building on the slip road (turn right out of terminal building and walk until you reach the end of the building). I just hitched to Oslo city centre in one lift (by holding up an 'Oslo' sign). The first car stopped. Or you can ask people at the airport if they're going to Oslo. My brother did this and got a lift with the first person he asked. I was heading East to Töcksfors (just over the Swedish border on the E18) so got dropped at the junction of the 151 near the town of Son and continued East from there. Not the easiest hitch (4 hours) but still much quicker than getting the airport bus into Oslo and then the Stockholm bus back out to Töcksfors. I found drivers friendly, willing to go a little out of their way, and everyone spoke good English.