Protesters at the Carrickmines Castle site have said they are willing to be arrested if it stops the routing of the South Eastern Motorway through part of the medieval site in south Dublin.
A group of about 20 protesters have been occupying the site at Carrickmines on a 24-hour basis since September.
That month, the Minister for Transport, Mr Brennan, approved the start of construction work at the site, saying modifications would preserve 60 per cent of the historic settlement.
Mr Vincent Salafia, a spokesman for the group, said it was curious that the protesters were never asked to move from the site or that gardaí had never been called in.
"If they do arrive, then some people here are ready to be arrested," he said.
The group has asked for a number of assurances, including the removal of heavy equipment from the site and the protection of the courtyard and driveway.
The group is also seeking a meeting with the archaeological contractor, the National Roads Authority, Dún Laoghaire-Rathdown County Council and the Department of Transport.
A spokesman for the National Roads Authority said the developers were anxious to resolve the issue. He said more than €6 million had been spent on archaeological excavations over the past 2½ years. While the main group of archaeologists left the site at the end of August, up to 50 archaeologists were still involved in retrieving artefacts, he said.
The archaeologists are now in the final stages of this work and the road construction is expected to begin within a month or so.
Construction work on the South Eastern Motorway is continuing on either side of the site. Last year, the European Commission wrote to the Government seeking information on the project.
The National Roads Authority is now finalising its "comprehensive and extensive" response. It rejects allegations that a key archaeological report was ignored when the road was designed.
