Prior to the construction of the Loughrea Bypass and M18 during the 2000s the N66 ran from the N18 road in Gort to the N6 in Loughrea itself and this was its configuration for most of its lifetime which was from c. 1970 to 2005.[1]
The N65, since 2010, continues north from Loughrea and forms an interchange with the M6. All routings lay entirely within County Galway.