NEW: BLACK ice and a thick frost will return to Co Donegal again tonight, making for new treacherous road conditions, the council has said.
Donegal County Council says gritters will be out on main designated roads across the county throughout the night and into tomorrow morning.
Temperatures will fall below -5C overnight.
There was chaos on roads throughout Co Donegal this morning as a heavy frost caused dangerous driving conditions.
There were a number of road traffic accidents but no-one was seriously hurt.
The roads are again expected to be particularly bad around the Twin Towns, Convoy, Letterkenny, Milford, Ramelton, across Inishowen as well as in Gaoth Dobhair, Ballyshannon, Pettigo and Donegal Town.
Parts of the roads around both Glenties and Ardara have remained treacherous all day as temperatures hovered around 0C.
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