"One of the physical features in the area of the Gabhra Valley that they could have imagined as being the “great Rath” and commemorative mound of the dead Fianna is the present-day Rath Lugh."
from The Tara Skryne (Gabhra) Valley in Early Irish Literature
by Dr. Muireann Ní Bhrolcháin
As Dr. Ní Bhrolcháin explains in the linked article, it is sometimes difficult to find written references to Rath Lugh in the mythology. I tend to concur with her position that this is due to name shifts over the centuries, and that Rath Lugh (more correctly, "Rath Lugha") plays a crucial role in mythology, history and the current metaphysical lay of the land.
The current road plans intend to pave over at least one of the holy wells of Rath Lugh, and pave over or bulldoze into the tombs. The outer edge of the Rath and the forest around it have already been badly damaged. Anyone with the slightest interest in Irish history and Irish mythology must realize the importance of this sacred site, and protect it.