Sleet and snow disrupts travel across the North West
A number of roads and local bus services in the north west have been affected by adverse weather conditions.
The falling snow has made driving conditions difficult in some areas, although roads are being gritted.
There is a Met Office warning for snow and ice across the west and north of Northern Ireland.
Translink have said express buses are operating as usual but some city services & rural areas may be disrupted.
'Thick and fast'
Harold Henry from Transport NI told BBC Radio Foyle that roads are passable but with care.
Earlier, he said snow was coming in thick and fast and it could continue, "particularly on the higher ground".
"Engineers will continue to monitor the situation and if further action is required it will be taken. Some temperatures have fallen before zero so there is a risk of ice as well."
Weather conditions continued to cause disruption on Tuesday night, with BBC Northern Ireland cameraman Phil Hilditch saying it had taken him more than two hours to travel from the BBC Foyle complex in Londonderry to Altnagelvin Hospital.
Police advised drivers to avoid the Scraghey Road in Castlederg, County Tyrone because of snow.
City of Derry airport have tweeted an apology to passengers for some "minor" flight delays, while Translink are issuing updates on disruptions to their rural and city services.
A number of local schools also closed including Cumber Claudy Primary School and Evish Primary School in Strabane.