Planning permission for the Galway City Ring Road is to be quashed by An Bord Pleanala.
It's because the board has conceded it failed to take into account the Government's new Climate Action Plan, adopted late last year.
An Bord Pleanala says it was not aware that the plan had been adopted when it granted permission for the €600m project in November.
It's after a High Court challenge was taken against the decision by The Friends of the Irish Environment group.
It's expected the planning application will re-examined, taking the Climate Action Plan into account before any new decision is reached.
Senator Sean Kyne has been speaking to David Nevin in the past few minutes to give his reaction.