Gardai have warned that "computer nerds" are creating safety issues on the country's roads by relying too heavily on sat navs.
Superintendent John Ferris said motorists are putting the safety of others at risk by failing to show "common sense" during the floods.
"We have computer nerds and people who won't use common sense and they are following the satellite navigation system - and it tells them to turn this way and that way, and they are ignoring the road signs that An Garda Siochana and the local authorities have agreed," Gda Supt Ferris said.
"There are potholes, there is road damage and people are driving way too fast - then they damage their car, they block what is already a small road and that causes difficulty for everybody."
The senior garda officer made the remarks following a meeting of the National Co-ordination Group.
Freezing weather conditions will create treacherous conditions on the roads, as flooding in most of the country finally shows signs of abating. Frost, sleet and snow are forecast for several parts over the next 24 hours, Met Eireann has said.
And further heavy rain is due to hit parts of the south and west over the weekend - creating the prospect of further flooding in many counties. But the colder weather will create hazardous road conditions for motorists.
In Wicklow, part of a path and wall collapsed beside a main road between Avoca and Rathdrum after heavy rainfall.
Meanwhile, Taoiseach Enda Kenny has said "common sense" needs to be applied in the debate over dredging the River Shannon, and has rejected claims that European laws have stopped dredging on the river and thereby contributed to the devastating floods of late.
"The European Commission issued a formal statement just this week indicating that the directives, both in terms of habitat and water, do not prevent dredging," he said.