The R115 / Military Road starts in Rathfarnham, County Dublin, outside the Yellow House pub and continues to the Ballyboden roundabout, where it intersects with the R113; it then follows the Edmondstown Road for 100 metres where it meets the R116. At this point the route takes the Scholarstown Road and turns left onto Stocking Lane where it rises through the Dublin Mountains (past the Hell Fire Club), followed by a descent into Glencree at the head of the valley of the Glencree river, with a spur down that valley to Enniskerry, before rising again to the vicinity of the entrance gate/road to the TV mast at Kippure (this part of the Military Road is the highest paved public road in Ireland at 523 m). It descends slightly to the Sally Gap Crossroads (elevation 495 m)(), where it intersects with the R759 road. From there it continues to a point east of Mullaghcleevaun Mountain (850 m) before descending to the village of Laragh, near Glendalough, via the scenic Glenmacnass waterfall.