Earlier, Greater Manchester Police said seven people were injured in a pile-up involving up to 10 cars on the frozen A627(M) motorway in Oldham.
Meanwhile, the Highways Agency and councils have cut their use of salt for gritting roads by half - up from the 25% cut agreed last week - to protect supplies.
Councillors in Leeds and neighbouring Kirklees warned they had less than two days' supply of salt left, while private salt firm Grittit has brought in security guards after 75 tonnes of material was taken from its depots nationwide.
Freezing conditions caused water pipes to split in many regions. Yorkshire Water has been taking 160 calls a day about the problem and has 75 teams repairing them.
Meanwhile, rescue teams in Snowdonia have warned about the dangers of avalanches after 500 tonnes of snow slid down a mountainside near Aber Falls.
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