The number of arrests for drug driving has exceeded those for drink-driving for the first time ever.
In the first five months of the year, 1,500 drivers were arrested after they were detected with drugs in their system.
During the same period, 1,400 people were detained by Gardai for drink-driving.
Ahead of the June Bank Holiday weekend, Gardai are warning that "drug driving has increased substantially in recent years".
It come as 78 people have been killed or seriously injured over the June Bank Holiday weekend in the last 5 years.
According to figures published by the Road Safety Authority, 12 per cent of men and 5 per cent of women admit to consuming alcohol before getting behind the wheel.
Assistant Commissioner Paula Hilman says "Intoxicated driving is a major factor in serious injury and fatal collisions on our roads. I appeal to people to drive safely and not to drive under the influence of alcohol or drugs."