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Norwegian National Road 23

National Road 23, also known as the Oslofjord Link, is a 40.2 kilometers (25.0 mi) largely limited-access road which connects the municipalities of Lier, Røyken, Hurum and Frogn in Norway. The 7.2-kilometer (4.5 mi) Oslofjord Tunnel causes the road to acts as the only fixed link crossing of the Oslofjord and makes that section subject to tolls.