The snow storm has left roads around Tallaght, Clondalkin and Lucan impassable this afternoon.
Roads in Crumlin, Dundrum and Castleknock are also shut, while flooding has forced the closure of The coast road between Dun Laoghaire and Sandycove.
Met Eireann has again extended a red alert warning for snow and ice in Dublin, which will now remain in place until 9am Saturday.
According to the AA, conditions are snowy right across Dublin, with the worst affected routes in the south and west.
The majority of routes around Tallaght, Citywest, Clondalkin and Lucan are impassable due to ice and thick coverings of snow on the roads, with Lucan Village and Liffey Valley inaccessible.
The Naul Road at the back of Dublin Airport is impassable, while Gardaí say it's very snowy in Castleknock too.
Thousands of buildings across Dublin are still without power after the storm.
Greenhills, Rathfarnham and Ringsend are among the worst affected areas.