The geophysical survey carried out as part of the Environmental Impact Statement identified a probable medieval moated site (c .60m x 60m) in Garretstown townland (at Garretstown 2). The medieval moated site at Garretstown 2 lies outside the roadtake, as the road was moved to avoid the square enclosure, but external features including industrial and agricultural activity have been exposed.

Artist's impression of a medieval moated site (after Billy Colfer). These were well-defended farmsteads usually on the margins of Norman territory.

http://www.m3motorway.ie/Archaeology/Section2/Garretstown2/