Heavy snow leads to 'horrendous' driving conditions
Heavy snow brought chaos to Northern Ireland's roads last night with many routes at a virtual standstill.
The north west around Londonderry and Coleraine suffered badly with police urged drivers to avoid the M1 and M2 motorways where conditions were described as "horrendous".
With the province's three airports at Aldergrove, Co Antrim, George Best Belfast City and City of Derry all hit by the weather, dozens of flights to and from UK destinations were delayed.
The Glenshane Pass on the main Belfast to Derry route and a mountainous stretch between Limavady and Coleraine, Co Derry, were only just passable.
Earlier, scores of schools stayed shut and are not expected to reopen until Wednesday at the earliest. Night classes were also postponed, as well events throughout the province.
A meeting in Dundalk, Co Louth, involving Northern Ireland Chief Constable Matt Baggott and the Irish Republic's Garda Commissioner Fachtna Murphy had to be called off.
Shops closed early and as thousands of people left for home there were delays on the congested roads in and around Belfast. In Derry and other parts of the north west many cars had to be abandoned.
After more than five hours of heavy snow in some areas the Met Office warned of another night of sub-zero temperatures, some as low as minus 8C. Police warned motorists only to travel if absolutely necessary and to stay away from minor roads.