Motorists are facing hazardous driving conditions with black ice on high throughout Calderdale.
Particular areas of concern, include Walsden, Heptonstall and Colden.
There is also traffic build up in the district.
The A629 Calderdale Way in Elland is busy but moving in both directions at the A6025 Halifax Road junction.
There is also heavy congestion in both directions on the A646 Burnley Road because of temporary traffic lights at Friendly.
There are no reported problems on the trains and buses.
Weather wise, Calderdale is set for cold and rainy conditions throughout the day, with lows of 3C and highs of 6C.