Published Tuesday, 04 December 2012
Black ice is affecting some routes. (© Pacemaker)
Police said the Ballydrain Road in Comber, Co Down, has been badly affected.
They added that caution should also be taken on roads in Banbridge, Rathfriland, Waringstown, Lurgan and Portadown due to black ice.
It follows bands of freezing showers overnight and a cold start to Tuesday, with a fairly widespread frost away from the North Coast.
The Roads Service said it applied more salt to the roads after rain washed some away.
A statement continued: "Bands of showers passing overnight have caused wash off of salt applied to the scheduled network yesterday evening.
"Further treatment is underway this morning and is due to be completed by 7am.
"Motorists and pedestrians are advised to exercise caution this morning especially when using untreated routes."
The frost is expected to melt away during the day as temperatures reach a maximum of 7C.
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