There is a ferry connection direction north from Hirtshals to Larvik, but there is no connection south from Larvik to Hirtshals. The south bound route always takes the overland path via Gothenburg (https://maps.openrouteservice.org/directions#/directions/400,Larvik,Norwegen/Containerkajen,Hjorring,ND,D%C3%A4nemark/data/55,130,32,198,15,97,4,224,38,9,96,59,2,24,5,192,166,6,113,0,184,64,70,0,24,3,164,32,86,0,153,240,5,128,54,1,57,247,214,171,15,182,128,104,207,180,129,153,232,14,207,140,173,0,28,132,4,48,175,64,55,15,65,189,105,53,27,217,173,50,133,169,112,28,91,173,90,189,122,21,25,32,99,122,32,56,128,128,1,213,60,8,137,176,229,0,11,202,0,91,92,194,172,222,129,0,12,222,0,6,221,23,4,22,26,30,0,13,201,0,28,192,22,140,25,26,18,196,15,221,0,61,26,29,17,12,12,47,7,50,3,195,215,54,29,22,4,0,23,202,168,0)