Lists of spiral (helicoidal) tunnels and tunnels on a curved alignment on roads and railway lines worldwide.

Road tunnels

* Churchischleif, road to

Isenfluh Isenfluh is a hamlet in Switzerland, north of the road from Wilderswil to Lauterbrunnen. It is first mentioned in 1319 as ''Ysenfluo'' and in 1401 people from the Lötschental started to settle in the small hamlet. The hamlet belonged to the mon ...

(

Switzerland ). Swiss law does not designate a ''capital'' as such, but the federal parliament and government are installed in Bern, while other federal institutions, such as the federal courts, are in other cities (Bellinzona, Lausanne, Luzern, Neuchâtel ...

) *

Drammen Spiral The ''Drammen Spiral'' (Norwegian : ''Spiralen Drammen'') is a tunnel near Drammen, Norway. Tunnel characteristics The tunnel is long and in the shape of a helix, with six rising circles, in the same style as a multi-storey parking lot. Each ro ...

, Norway * on SS 659 near

Formazza Formazza ( wae, Pumât, pms, Formassa) is a ''comune'' (municipality) in the Province of Verbano-Cusio-Ossola in the Italian region Piedmont, located about northeast of Turin and about north of Verbania, on the border with Switzerland. Formazz ...

Italy Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical ...

(full 360° turn) *

Horda Tunnel The Horda Tunnel ( no, Hordatunnelen) is a road tunnel in Ullensvang Municipality in Vestland county, Norway. The long tunnel is in the village of Horda. The tunnel is a spiral tunnel, turning almost a complete circle while continuously trav ...

, E134, Norway * Jinjiazhuang Tunnel (金家庄隧道), world's longest spiral highway tunnel, located in

Chicheng Chicheng (), or Ch’ih-ch’eng, is a county under the administration of Zhangjiakou City, northwestern Hebei province, bordering Beijing to the southeast. The total area of the county is . The easternmost county-level division of Zhangjiakou, ...

Zhangjiakou Zhangjiakou (; ; ) also known as Kalgan and by several other names, is a prefecture-level city in northwestern Hebei province in Northern China, bordering Beijing to the southeast, Inner Mongolia to the north and west, and Shanxi to the south ...

, China * Tagountsa Tunnel, High Atlas, Morocco. A short spiral tunnel built along a now disused military road in 1933.https://www.google.com/maps/place/32°10.125'N+4°56.57'W * Wolonggou Tunnel (卧龙沟长隧道) a motorway tunnel between

Xunhua Xunhua Salar Autonomous County ( zh, s=循化撒拉族自治县, p=Xúnhuà Sǎlázú Zìzhìxiàn; slr, Gökhdengiz Velayat Yisyr Salyr Özbashdak Yurt) is a Salar autonomous county in the southeast of Haidong Prefecture of Qinghai Province, C ...

and Linxia in

China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's List of countries and dependencies by population, most populous country, with a Population of China, population exceeding 1.4 billion, slig ...

Railway tunnels

A part of a line is bracketed (), if it is located in a country other than that mentioned in the specific table: Example: :(Lausanne – Montreux – Sierre – Visp – Brig – ) →

Africa

South Africa

Americas

Canada

Asia

Russia

Europe

Croatia

France

Germany

Italy

Norway

Russia

Switzerland

The turn tunnels in the following table are sorted from West to East according to the location of the start point of the line.

Slovakia

United Kingdom

Oceania

New Zealand

Australia

References

* Hans G. Wägli: Schienennetz Schweiz/Réseau ferré suisse; Schweizerische Bundesbahnen, Generalsekretariat; 1980; (Edition 1998) Locations partly from:
Bundesamt für Landestopografie
Landeskarte der Schweiz, Zusammensetzung 101, Thuner See Zentralschweiz, 1:100'000, 1987
Office fédéral de topographie
Carte nationale de la Suisse, Assemblage 104, Lausanne-Bern, 1:100'000, 1986 * Office fédéral de topographie, Carte nationale de la Suisse, Assemblage 105, Valais∙Wallis, 1:100'000, 1987 * Bundesamt für Landestopografie, Landeskarte der Schweiz, Zusammensetzung 106, Glarnerland Bündnerland, 1:100'000, 1985
Ufficio federale di topografia
Carta nazionale della Svizzera, Carte riunite 107, Ticino∙Tessin, 1:100'000, 1987 {{DEFAULTSORT:Spiral Tunnels And Tunnels On A Curved Alignment

Spiral In mathematics, a spiral is a curve which emanates from a point, moving farther away as it revolves around the point. Helices Two major definitions of "spiral" in the American Heritage Dictionary are: