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29 November 2010
Last updated at 02:20 ET
Gritting lorries servicing dangerously-icy roads have been attacked by youths in Londonderry on Sunday.
The window of one vehicle was smashed and the Roads Service was not able to treat a number of roads in the Creggan and Gobnascale areas.
Elsewhere, the service said all roads had now been treated and were "passable with care".
Many areas, however, are experiencing ardous driving conditions and several schools will remain closed.
Overnight emperatures in Castlederg, County Tyrone, were recorded at -8.5C and -7.1C in Enniskillen.
On Sunday, temperatures plummeted to the coldest on record for November in Northern Ireland.
The lowest reading was at Lough Fea which dropped to -9.5C (14.9F).
The next coldest temperature was -9C (15.8F) recorded in 1978 at Murlough.
The Roads Service warned of extremely hazardous driving conditions and advised drivers to exercise caution.
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The window of one vehicle was smashed and the Roads Service was not able to treat a number of roads in the Creggan and Gobnascale areas.
Elsewhere, the service said all roads had now been treated and were "passable with care".
Many areas, however, are experiencing ardous driving conditions and several schools will remain closed.
Overnight emperatures in Castlederg, County Tyrone, were recorded at -8.5C and -7.1C in Enniskillen.
On Sunday, temperatures plummeted to the coldest on record for November in Northern Ireland.
The lowest reading was at Lough Fea which dropped to -9.5C (14.9F).
The next coldest temperature was -9C (15.8F) recorded in 1978 at Murlough.
The Roads Service warned of extremely hazardous driving conditions and advised drivers to exercise caution.
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