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M50 Motorway In Dublin In Ireland. The M50 Motorway (Irish: Mótarbhealach M50) Is A C-Shaped Orbital Motorway In Dublin And The Busiest Motorway In Ireland. The Current Route Was Built In Various Sections Over The Course Of 27 Years, From 1983 To 2010. It Begins At Dublin Port, Running Northward Through The Dublin Port Tunnel And Along A Portion Of The Airport Motorway. It Then Turns West At Its Junction With The M1, Circling The Northern, Western And Southern Suburbs Of Dublin, Before Merging With The M11 At Shankill In South East Dublin.