Action is being taken as a result of their being 129 deaths on Irish roads so far this year.
Areas where road fatalities are more likely to occur will see an increased presence of speed vans.
Gardaí say the action is being taken as a result of the 129 deaths on Irish roads so far this year, 65% of which involved a single-vehicle.
The Meath Westmeath Garda division has seen 12 road fatalities up to this point in 2023, while there's been 10 in the Kildare Laois Offaly division.
The aim of the campaign is to reduce speed-related collisions, reduce injuries and above all save lives.
Mobile Safety Cameras Assistant Commissioner Pauls Hilman, Roads Policing and Community Engagement says:
"Mobile Road Safety Cameras are deployed within identified stretches of road with a known traffic collision history or the prevalence of vulnerable road users. Mobile Safety Cameras are designed to change driver behaviour in these high-risk stretches of road. The additional hours are being targeted within the areas where the highest proportion of fatal road collisions are taking place. However Mobile Safety Cameras will continue to operate as normal also throughout the rest of the country.
An Garda Síochána continue to deploy Roads Policing members on our road network across the country. Last Monday, on National Slow Down Day, over 865 drivers were detected driving in excess of the speed limit. Each individual driver has a responsibility to slow down and not just drive within the speed limit but to the appropriate speed for the road, weather, traffic and vehicle conditions. An Garda Síochána will continue to prioritise our response to the very alarming trend in increase in fatalities on our roads."