Norwegian National Road 23
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| Norwegian: Riksvei 23 Nynorsk: Riksveg 23 |
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| Route information | |
| Length: | 40.2 km (25.0 mi) |
| Major junctions | |
| From: | Linnevollen, Lier |
| E18 282 165 289 281 152 E6 | |
| To: | Vessum, Frogn |
| Highway system | |
| National Roads in Norway | |
National Road 23 (Norwegian: Riksvei 23), also known as the Oslofjord Link (Norwegian: Oslofjordforbindelsen), 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.
National Road 23 is the result of the need for an auxiliary road to support a fixed link crossing of the Oslofjord. Since 1939 this crossing was carried out by the Drøbak–Storsand Ferry, a service operated by Bilferjen Drøbak–Hurum. The ferry had a daily traffic of 320 vehicles in 1980. A fixed crossing of Hurumlandet and the Oslofjord was first proposed by Anton Grønsand in 1958. It was followed up in a regional transport plan published in 1963, with a horizon of forty years. Road planning was in the following decade reorganized so that most planning fell within the jurisdiction of a single county. As a crossing of the Oslofjord invariable would have to cross a county border, plans fell outside the natural planning framework. As the idea fell out of the main workload of planners, a limited company, A/S Fjordbroene, was established in 1967. Initiated by Hurum Municipality, it was also partially owned by larger companies in the municipality. It attempted to revitalize the proposal and launched a detailed plan in 1974 which called for two bridges which would connect each side of the fjord to the island of Håøya. The cost of the project was steep, the Håøya bridges alone estimated at 510 million 1981 Norwegian krone (NOK). The plans were rejected by the road administration because of the steep cost and low traffic prognosis, while others criticized the environmental impact it would create on Håøya and at the towns of Svelvik and Drøbak.
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