European route E45 in Sweden that it had several numbers. From south they were 45 (Göteborg-Grums), 234 (Grums-Mora), 81 (Mora-Östersund) and 88 (Östersund-Karesuando). Before the year 1985 the road Östersund-Karesuando had several numbers, 88, 343, 97, 98, 395 and 396. Before year 1962 the road Göteborg-Grums was called road 7. European route E45 in Sweden European route E45 in Sweden, previously Swedish national road 45, is a national road and the longest road in Sweden, with a length of 1,690 km (1,050 mi). It is one of the longest national roads in Europe. It covers the stretch between Gothenburg and Karesuando via Trollhättan, Vänersborg, Mellerud,
Siljan Ring by rocks of the Llandovery series (Lower Silurian). During the last ice age the area was covered by a thick icesheet. The bedrock was sculpted by the ice, with the softer Palaeozoic sedimentary rocks being preferentially eroded. These erosional hollows are now occupied by lakes Siljan, Orsa, Skattungen and Ore. In accordance with theories about abiogenic petroleum (that hydrocarbons can be formed without involving material from dead plants and animals), astrophysicist Thomas Gold suggested that there might be major deposits of oil and natural gas in the area. Drilling was carried out in the late 1980s and early 1990s but