From the west side of Oslo to the border with Sweden at Svinesund. Without touching the highway. Where not to make the road to the goal, part of the way?
Sorry only Norwegian comments, but it is not much of value I say.
And you will probably avoid hearing my awful English anyway....
The trip starts right after the Oslofjord tunnel, which goes under the fjord. At its deepest, we are 134 meters below sea level.
If you come from Sweden, large parts of Norway are now ready to be explored. And there is no disadvantage to avoiding driving through Oslo, especially during rush hour it is unpleasant to drive there.
Good trip!

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