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.

[1] 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.

[4][5] The Øresund crossing begins as a tunnel at Kastrup, which then transfers onto the bridge at the man-made island Peberholm.

Furthermore, it is a motorway most of the route from Vretstorp (20 km (12 mi) west of Örebro) to Stockholm.

The part through Stockholm has very heavy traffic, including the most heavily trafficked road in Scandinavia[citation needed], Essingeleden (160 000 vehicles/day).

A new tunnel for route E20, "Norra länken", was built north of the city center and opened 30 November 2014.

[citation needed] Between Stockholm and Tallinn a car ferry departs daily, taking 15 hours.

The port in Stockholm is located at Lilla Värtan, about 4 km northeast of the central core of the city.

The border crossing requires a reservation - despite this, waiting lines still can extend for many hours and even days.