European route E20 is a part of the United Nations International E-road network. It runs roughly west–east through Ireland, the United Kingdom, Denmark, Sweden, Estonia, and Russia. Its length is but it is not continuous; at three points, a sea crossing is required. Roll-on/roll-off ferries make the crossings from Dublin to Liverpool and from Stockholm to Tallinn. No publicly accessible ferries traverse the North Sea from Kingston-upon-Hull to Esbjerg (as of 2019), but a ferry for commercial drivers leaves Immingham for Esbjerg on most days. Route Ireland The initial section of the E20 from Shannon Airport to Dublin via Limerick is approximately 228 km long and is only partially signed, along the M7/N7. The section from Shannon Airport to east of Limerick is mainly dual carriageway, with a short section of motorway as part of the Limerick Southern Ring Road. The Shannon Tunnel, opened on 16 July 2010, completed the bypass of Limerick. The section from Limerick to Naas is motorway (M7), and the final section from Naas to Dublin is dual carriageway (N7). A ferry must be used from Dublin to Liverpool. United Kingdom E20 follows the A5080 from Liverpool to Huyton, the M62 and M60 from Huyton to South Cave, and the A63 from South Cave to Kingston upon Hull. The route length across the UK is in total but is not signposted. There are no ferries between Kingston upon Hull and Esbjerg. Alternative ferries were once available from Immingham, which is from Kingston upon Hull, and Harwich, which is from Kingston upon Hull. There are no longer any passenger routes operating between the UK and Scandinavia. The closest alternative is to take the Eurotunnel Shuttle from Cheriton (Folkestone) to Calais, or take a ferry from Harwich to Hook of Holland. Both of these routes would require a detour of around 900 miles (940 miles to Esbjerg, as this route would require you to drive along the E20 to reach Esbjerg). Denmark In Denmark, E20 is a motorway from Esbjerg to the Øresund Bridge. The length of the Danish part is . It passes first along Jutland from Esbjerg to Kolding, then crosses the Little Belt Bridge onto Funen. E20 crosses the entirety of Funen, passing approximately 2 km south of Odense. Then, at Nyborg, E20 crosses the Great Belt Fixed Link onto Zealand. E20 follows the Vestmotorvejen until Køge, where it goes north to Copenhagen. In Copenhagen,