Route 40, known as Hafnarfjarðarvegur (Icelandic pronunciation: [ˈhapnarˌfjarðarˌvɛːɣʏr̥], lit.

'Hafnarfjörður Road') in Icelandic or by its busiest stretch, Kringlumýrarbraut ([ˈkʰriŋlʏˌmiːrarˌprœyːt], lit.

'Kringlumýri Road'), is one of the two major traffic arteries running across Capital Region.

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