Almost 800 people were arrested for drink-driving over a four-week period, with 12,858 breath tests carried out in the same period.
Gardaí say that despite reduced traffic over the Christmas period, the figures for driving under the influence remain high.
From 4 December to 5 January, 790 people were arrested for driving under the influence.
Penalties were issued to 1,096 motorists for using a mobile phone while driving and 314 Fixed Charge Notices were also issued over seatbelt violations.
Ten people were killed in road crashes during this time, compared to 16 for the same dates in 2019/20.
Figures show that there were 148 road deaths in 2020, an increase of eight on 2019.
Almost 800 people were arrested for intoxicated driving over a four-week period last month, with 12,858 breath tests carried out in that time | More: https://t.co/p0vY7Zmkjd pic.twitter.com/UwGQCHlw8a— RTÉ News (@rtenews) January 27, 2021
During 'National Slow Down day' on 11-12 December, gardaí detected 892 motorists driving over the speed limit.
An Garda Síochána and GoSafe checked 186,125 vehicles during the 24-hour period.
Assistant Commissioner Paula Hilman, Roads Policing and Community Engagement Bureau, said: "The message is clear, never drive if you are under the influence of alcohol or drugs, or a combination of both."
She appealed to motorists not to speed, which "will reduce injuries on our roads and save lives".