An Garda Síochána has begun commissioning and testing average speed cameras in Co Cavan and Co Mayo.
It is part of the planned introduction of three average speed cameras and nine static speed safety cameras across the country this year.
Infrastructure and technology for two camera systems have been installed on the N3 in Cavan, between Kilduff and Billis, and the N5 in Mayo, between Lislackagh and Cuilmore, Swinford, gardaí have said.
Works on these cameras will continue for a number of weeks.
The other average speed camera will be located on the N2 at Slane, Co Meath.
Sites for these cameras were chosen because they meet the criteria as being high collision sites with numerous road traffic collisions, involving injury, serious injury and fatalities, gardaí said.
Average speed cameras work by monitoring a vehicle's speed between two points over a certain distance and issuing a Fixed Charge Notice to anyone detected exceeding the speed limit.
The use of average speed cameras in the Dublin Port Tunnel and between Junctions 26 and 27 on the M7 are effective in getting drivers to reduce their speed, gardaí said.
The static speed cameras will be located on the N59 in Galway, N25 in Waterford, R772 in Wicklow, N14 in Donegal, N80, in Carlow, Dolphin’s Barn in Dublin, N17 in Mayo, N22 in Cork, and N69 in Limerick.
Advanced notice will be given before the enforcement phase begins, gardaí said.
Minister for Justice Helen McEntee said there has been an unacceptable number of road deaths in recent years and the introduction of the cameras should help reduce this.
Speaking on RTÉ's Morning Ireland, she said that increased technology, garda presence and better driver behaviour will result in better outcomes.
"More average speed cameras and static cameras across the country, coupled with gardaí, coupled with, obviously, improvements in our roads, but also people changing their behavior.
"And I have to stress this, the gardaí are saying very clearly, and it's post-Covid in particular, people are taking more risks. They're speeding. They're getting into the car after drinking, taking drugs, and you can see that reflected in our roads."
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