An overnight weather warning for snow and ice is still in force on Wednesday morning.
It lasts until noon, with road users warned of dangerous conditions.
The Met Office has said that snow and icy patches could lead to some disruption to travel.
The alert covers all six Northern Ireland counties.
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Travel caution as weather warning remains in force
Two school closures confirmed on Wednesday morning
More reader snow pics from across NI
Crash in Co Antrim with Shore Road delays
Elsewhere, there are significant delays in both directions in Whiteabbey with the Shore Road down to one lane.
What is the forecast for the rest of the week?
Frost and patchy fog are still expected across the rest of the week, with some snow followed by clouds and patchy rain later Friday or Saturday.
The weekend should then see temperatures begin to rise, with highs up up to 12 degrees expected by the start of next week.
How cold is it?
Travel caution as weather warning remains in force
The Met Office has warned drivers of dangerous conditions. Walkers have been warned to take care on footpaths while cyclists are advised to stick to main, treated roads. There is a chance of some freezing fog in the southern parts of the province.
A police spokesperson said: “Road users are advised to exercise caution due to icy roads throughout Northern Ireland.
“Stopping distances increase greatly when weather conditions are poor, so slow down and leave a bigger gap between your vehicle and the vehicle in front.”
Two school closures confirmed on Wednesday morning
- St Patrick’s and St Brigid’s College, Claudy
- Cumber Claudy Primary School
Weather forecast
Tomorrow is set to be a mostly dry but cold day in Northern Ireland, with some sunshine. A few coastal wintry showers and icy patches are expected with a maximum temperature of 2C.
Road salting
Travel warning
Snow-capped Mournes
New Met Office warning comes into effect in NI
The Met Office has warned of widespread snow and ice until noon tomorrow.
Travel disruption is expected this evening and tomorrow morning.
More reader snow pics from across NI
A danger to life flood warning is in place as dozens of people have been rescued by firefighters – and more rain, sleet and snow are on the way.
People living at caravan parks near Barrow upon Soar, Leicestershire, have been urged to act now, with a large-scale evacuation required to save lives after heavy rainfall and rapid snowmelt amid the Environment Agency’s severe flood warning for the River Soar.
One man was rescued from a caravan in Proctors Park, Barrow upon Soar, on a raft on Tuesday morning.
And two people had to be rescued from flood water by firefighters in Leicester Road, Leicester, on Monday afternoon, Leicestershire Fire and Rescue Service said.
Leicestershire Fire and Rescue Service said as of 6am on Tuesday, 59 people had been rescued – including the two in Leicester Road, who were attempting to walk through flood waters and lost their footing.
A spokesperson for the fire service said firefighters and paramedics attended as the people had to be rescued with a water raft and had sustained some injuries.
In North Yorkshire, police said the body of a man had been recovered on Monday from an area of flooding in Beal, near Eggborough and Knottingley.
Scores of flood warnings remain in place across England as fresh snow flurries hit London and Manchester on Tuesday morning.
Readers send in stunning snow pictures from across Northern Ireland
Motorists struggling with driving conditions on the M2
Stunning snow pics in Co Tyrone town
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New weather warning
It will be in place from 3pm today until noon tomorrow for all six counties of Northern Ireland and disruption to travel is expected.
Wintry showers of rain and sleet near coasts, and snow inland, will continue to affect Northern Ireland this afternoon and into this evening. Overnight, showers should become confined to coastal areas.
With winds easing, it is likely to be a much colder night than last night, bringing widespread frost and icy patches.
People are advised to allow extra time for any journeys and to check for road closures.
If driving, make sure you have some essentials in your car in the event of any delays (e.g. warm clothing, food, water, a blanket, a torch, ice scraper/de-icer, a warning triangle, high visibility vest and an in-car phone charger).
The Met Office also says be prepared for weather warnings to change.
Winter scenes in Co Tyrone
Co Tyrone two-vehicle crash
Schools closed after overnight snow
Donemana Primary School: 31 Longland Road
Glendermott Primary School: 50 Ardmore Road
St Peter’s Primary School Plumbridge: 415 Lisnaragh Road
Our Lady of Fatima Primary School: 92 Ervey Road, Tamnaherin
St Patrick’s and St Brigid’s College: Claudy, 55 Main Street
Rossmar School: 2 Ballyquin Road