The initial section of the E 20 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 16th 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... Read More