Gardaí have arrested four drivers on suspicion of drink and drug-driving since Friday evening.
One driver was detained after flashing an unmarked patrol car on the N4 dual carriageway -- and then overtaking at 130 km/h.
The driver was arrested on suspicion of drink driving.
Gardaí are warning people to slow down, put away mobile phones, and never drive under the influence of an intoxicant.
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The Road Safety Authority says research shows young men are the most vulnerable group on the roads when it comes to drink and drug-driving.
