A MET Office weather warning is in place for snow in some parts of Northern Ireland on Monday and a number of schools have been closed.
On Monday afternoon, the PSN warned motorists that the Tornagrough Road, Hannahstown, west Belfast in the area of Quarterlands is extremely treacherous.
Drivers are advised to drive with care in the area.
Scattered rain, sleet and snow showers will continue on Monday morning, mainly across east and southeast.
It has been snowing heavy this morning in Glengormley, Carnmoney and in the Glens of Antrim.
The PSNI revealed on Monday morning that the Carntall Road in Newtownabbey has been closed at its junction with the Doak Road due to a two vehicle collision and the snowy conditions.
Flights from George Belfast City airport to Leeds/Bradford were cancelled on Monday morning because of heavy snow in England.
The wintry mix is expected to become more widespread and heavier throughout the day.
Inland parts of Counties Down, Armagh and Antrim will bear the brunt of any falls of fresh snow in the evening.
It is possible that 2cm to 5cm of snow could fall in there areas, with more on the hills.
The Roads Service has advised motorists to exercise caution when travelling, particularly when driving on untreated roads.
A number of schools have already been closed due to the weather conditions.
• Glenbank Nursery School, Belfast
• St Mary’s on the Hill, Glengormley, County Antrim
• Lagan College, Belfast
However, staff at the college said A-level module exams will continue if students can make their safety to and from the school.