Vestfjarðagöng


Vestfjarðagöng is the longest tunnel in Iceland, located in Westfjords in northwestern Iceland. It has a length of and was opened in September 1996.
The tunnel has three entrances and the three arms meet at junction in the tunnel. The three arms are known as:
Only the Tungudalur arm has two lanes throughout. Much of the rest of the tunnel has only one lane with passing places, with traffic light control to avoid collisions.
The tunnel avoids the Breiðadalsheiði road pass, whose summit at 610m was formerly the highest pass in regular use in the Westfjords. It was frequently blocked by snow and prone to avalanches.