Routes to be introduced in Phase 6a will serve communities between Dublin Airport, north Dublin, the city centre, south Dublin, Dun Laoghaire, and north Wicklow.

The companies, which have registered offices in Co Monaghan, say the removal of regular traffic will have a “catastrophic” effect on the commercial viability of their site.

The case asks the court to overturn An Bord Pleanála’s approval of the 8.3km road project from Blackrock to Dublin City Centre