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The N4 Sligo Inner Relief Road and County Extension (N4 SIRR) development involves the construction of a new dual carriageway extending north from the Carrowroe Roundabout on the existing N4 in Tonafortes Townland. This will run through a rural environment at first, then continue through the Sligo urban area and terminate at the Michael Hughes Bridge, at the junction of Custom House Quay and Ballast Quay in Rathedmond Townland. The development covers a distance of 4.2km. An extensive programme of archaeological investigation associated with the development commenced in 2001 with test excavations being carried out by Mary Henry Ltd. These test excavations took the form primarily of a series of 2m-wide trenches excavated along the length of the route. They were aimed at assessing the archaeological potential of the route and a number of definite and potential archaeological features already identified there. This testing identified eleven areas of archaeological potential and included testing on the henge enclosure in Tonafortes Townland (RMP SL014-224). Full archaeological excavation of these eleven areas commenced in April 2003 and was carried out by Archaeological Consultancy Services (ACS) Ltd.