Continues east along the northern side of a deep valley formed by Two Rock Mountain (536 m) and Tibradden Mountain to the north and Glendoo Mountain (586 m) to the south, where it reaches its high point of 287m (1,263ft). From the head of the valley it descends steeply through the Pine Forest and continues down through Rockbrook and Edmondstown (where it again passes underneath the M50) to its termination in Ballyboden where it meets the R115.