Interstate 55

Interstate 55 is a major north–south Interstate Highway that spans 2,330 miles (3,749.77 km) from Palermo in Italy to southern Norway. I-55 is the longest Interstate in Europe.

I-55 is split into two segments: The first section runs entirely on the island of Sicily. With only 129 miles (207.6 km), I-55 runs from Palermo with IT-113 to Messina, Italy with IT-55 and I-57. Across the Strait of Messina, the second section stretches from Villa San Giovanni, Italy with IT-55 to NO-6 south of Lillehammer, Norway. Major cities connected by I-55 include (from south to north) Palermo, Messina, Naples, Rome, Florence, Bologna, Milan, Zürich, Stuttgart, Frankfurt, Hanover, Hamburg, Copenhagen, Malmö, Gothenburg, and Oslo.

Italy
See also: Interstate 55 in Italy

Switzerland
See also: Interstate 55 in Switzerland

As soon as I-55 enters Switzerland, the freeway begins to run through the Alps. I-55 is then goes through the small town of Bissone before meeting its first exit with CH-13. The freeway meets the Gotthard Road Tunnel to pass through St Gotthard Pass not so long after meeting CH-13. Due to the length of the tunnel, I-55 is forced to use two lanes from one end to the other end of the tunnel.

Germany
See also: Interstate 55 in Germany

Denmark
See also: Interstate 55 in Denmark

Sweden
See also: Interstate 55 in Sweden

Norway
See also: Interstate 55 in Norway

Italy

 * I-4 in Buonfornello
 * I-57 / IT-55 in Messina
 * IT-55 in Villa San Giovanni
 * I-355 in Lamezia Terme
 * IT-7 in San Licandro
 * I-75 in Cis
 * IT-45 in Caserta
 * IT-17 in Cassino
 * I-955 in Rome
 * I-10 / IT-240 in Rome
 * IT-90 in Rome
 * IT-3 in Orte
 * IT-73 in Burchio
 * IT-69 in Tavarnuzze
 * I-10 / IT-18 in Florence
 * I-575 in Bologna
 * I-65 in Modena
 * I-220 in Milan
 * I-20 in Corsico
 * I-20 in Dugnano

Switzerland

 * CH-13 in Bellinzona
 * I-28 in Oftringen
 * I-50 in Baden
 * I-28 in Winterthur

Germany

 * DE-294 in Rottweil
 * I-50 / I-68 in Stuttgart
 * DE-5 in Karlsruhe
 * DE-39 in Walldorf
 * DE-155 in Mannhiem
 * I-66 in Frankfurt
 * I-70 / DE-45 in Gambach
 * I-59 in Breitenbach
 * I-70 in Kirchheim
 * DE-7 in Kassel
 * I-72 in Friedland
 * TBC

Italy

 * I-355 - A spur connecting I-55 and Catanzaro
 * I-955 - The southern beltline of Rome, connecting the airport and the city.

Germany

 * I-355 was a spur connecting I-55 and Kiel. It was replaced by I-455 in September 2021.
 * I-455 - A beltway I-55 in Kiel

Denmark

 * I-555 - A connector for Esbjerg and I-55
 * I-755 - A spur connecting Gedser and I-55 near Copenhagen.

Sweden

 * I-255 - Connects Trelleborg and Malmö
 * I-155 - A spur that connects Gothenburg and I-55.

Norway

 * I-355 - A spur connecting NO 18 and Oslo.