Almost half of learner drivers are breaking the law, according to new figures released by An Garda Síochána.
Two recent garda operations which targeted learner drivers found 43% were failing to adhere to the conditions under which they were granted driving permits.
Out of 2,200 learner drivers stopped at checkpoints, 946 were unaccompanied by a full licence holder.
Three out of 10 also failed to display L-plates on their vehicle — another road traffic offence.
Gardaí confirmed court proceedings are being taken against 279 learner drivers, while a further 949 received an official caution.
There are an estimated 235,984 learner drivers in the Republic, of which 114,632 are holding their first permit.
The issue of learner motorists driving without being accompanied by an experienced driver was a particular focus of garda enforcement of road safety over the bank holiday weekend.
Assistant Commissioner John O'Mahoney said gardíi will continue to prioritise the enforcement of regulations to ensure greater compliance by learner drivers.
"One of the focuses of An Garda Síochána this year is particularly on the area of learner drivers," he said.
"The more inexperienced you are, the more likely you are to make a mistake (and) to do something which can result in a serious or fatal collision."
Additional reporting: Irish Examiner