Motorists are being advised to drive with extreme caution after reports of flooding and debris on the roads following overnight storms.
Roads Service NI has said it dealt with 49 fallen trees and there could also be ice in some areas.
The Glenshane Pass which was affected by snow was treated on Sunday night and is expected to be clear of snow on Monday.
Roads Service dealt with 22 incidents of flooding on roads overnight.
The Foyle Bridge in Derry is now open to high-sided vehicles.