Bus Eireann is warning that some school bus routes may be subject to disruption due to flooding.
The company says where flooding is an issue, most services will operate with disruptions.
However, a small amount of routes may be unable to operate until flood waters recede.
Details of affected routes, below, are also on the Bus Eireann website.
Elsewhere, the Road Safety Authority is warning drivers to also be aware of icy road conditions this morning.
RSA spokesperson Brian Farrell said: "The most important thing you've got to do is remove the most important ingredient in causing skids on ice, and that is the speed of your vehicle.
"It really is important to slow down and not to panic if you do find yourself in a situation where you are skidding on ice. The car will tend to find its grip, but one of the most important things you've got to do is check to see what kjind of safety assist features your car has."
The school bus areas currently affected include:
North Mayo – all services expected to operate, some diversions will apply
South Mayo – Ballinrobe/Neale area, services will operate with diversions
Offaly – flooding in the Pollagh area serving Ferbane post primary centre means this service may operate to the closest safe point to Pollagh village only
Longford – service to Moyne on the R14070 will be disrupted affecting a small number of families
Athlone – main roads currrently clear, so services not affected
Carlow – Bagnelstown, services expected to operate with some diversions
Kilkenny – Graiguenamanagh, Bennetsbridge, Inistogue, Thomastown – services expected to operate with some local diversions
Tipperary – Cahir, Carrick on Suir, Clonmel – services expected to operate with some local diversions
Waterford – Aglish, Clashmore – services expected to operate with some local diversions
Wexford – Enniscorthy – services expected to operate with some local diversions
Sligo – all services expected to operate, some diversions will apply
Galway – services are generally expected to operate normally with the exception of service to Kilcolgan ETNS from the Labane/Kilcogan area, which will operate with diversions. Services to Gort and Kinvara post primary schools will operate but will be rerouted via Kilcolgan. Kinvara national school and Ballyglass national school may also be affected
Roscommon – all services to operate as normal with the exception of one service from the Carrowmore/Ballintubber area to Castlerea post primary centre which currently will not be able to operate
Cork – diversions will be in place on the Killeagh to Castlemartyr Road in East Cork affecting services to Midleton post primary and Carrigtwohill primary schools. Services to Scoil Triest in Cork City from East Cork will also be subject to diversion. All other services expected to operate as normal
Monaghan – services to Ballybay, Rockcorry and Latton from the Cootehill Road are not expected to operate. Service to Central national school (Castleblayney Central School), Oram national school and Castleblayney post primary schools from the Keady Road will be disrupted and may not be able to operate. All other services expected to operate as normal, some with minor diversions
Cavan – service to Cootehill post primary and Dernakesh primary schools from Canningstown Road/Sharpes Corner are not expected to operate. Service to St Bricin’s post primary in Belturbert from the Belturbert-Killeshandra Road may not be able to operate. All other services expected to operate as normal, some with minor diversions
Kerry – Currently all services to operate as normal with the possible exception of Banna/Ballyheighe where a minor diversion may be necessary
Limerick/Galway – Services to Gort and Kinvara post primary schools will operate but will be rerouted via Kilcolgan. Kinvara national school and Ballyglass national school may also be affected