Four people have died in separate road collisions in Louth, Kerry, Roscommon, and Donegal.
In Co Louth, a man in his 40s died after he was struck by a car at Junction 16 on the southbound carriageway of the M1 near Dundalk in the early hours of Sunday morning.
The incident occurred at around 2.45am.
Four people in the car were treated at the scene for non-life threatening injuries.
The road was closed for a technical examination and local diversions were in place.
Gardaí are appealing to any witnesses, particularly any road users who were travelling on the M1 between 2.30am and 3am, and who may have camera footage (including dashcam), to contact Dundalk Garda Station on 042 938 8400, the Garda Confidential Line on 1800 666 111 or any garda station.
In Co Kerry, a teenager died after a road collision near Listowel, on Saturday night.
Gardaí say the boy, who was aged in his late teens, was seriously injured in the incident, which occurred at around 9.50pm on the R555 at Duagh village, Listowel.
He was taken to Kerry University Hospital, where he later died.
The driver of the car and three other passengers were not injured.
The road was closed for a technical examination and local diversions were in place.
Gardaí are appealing for any witnesses, or any road users who were travelling on the R555 last night between 9.30pm and 10pm, and who may have video footage, to contact Listowel Garda Station on 068 50820, the Garda Confidential Line on 1800 666 111 or any garda station.
Elsewhere, a man in his 20s died when the car he was driving overturned at Skrine Hill in Co Roscommon, in the early hours of Sunday morning.
Gardaí say no other vehicles were involved.
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The road was closed and local diversions were in place.
Gardaí are appealing to road users travelling in the area between 2.30am and 3am, and who may have camera footage (including dash-cam), to contact Roscommon Garda Station on 090 663 8300, the Garda Confidential Line on 1800 666 111 or any garda station.
In Donegal, a man in his 40s was killed after a motorcycle crash on the R262 near Glenties shortly before 4pm yesterday.
The motorcyclist was treated at the scene before being pronounced dead a short time later.
The section of road between Kilraine and Frosses was closed off for a forensic examination, and gardaí in Glenties are appealing for witnesses to contact them on 074 9167100.
The latest death bring to 144 the number of people who have died on Irish roads so far this year.
Those figures are up significantly on last year and are among the worst recorded in recent times.
These road deaths also came during Irish Road Safety Week.
New figures show that the number of gardaí involved in roads policing has dropped by more than a third since 2009.
That year, 1,046 gardaí were involved in roads policing, but this year, that figure has fallen to an average of 676.
Peadar Toibin, Aontú Leader, who obtained the figures in a parliamentary question, called for more investment in the recruitment and retention of gardaí.
"It's incredible that over the last 14 years, there's been a massive fall in the number of gardaí policing the roads, a fall of 36%," he said.
"That figure is falling every single month this year as well.
"Unfortunately, there is a direct correlation between this fall in garda figures and the increased deaths. We're urging the minister to make sure that we start to fund gardaí properly, to treat the gardaí properly and to recruit more."
Minister of State for Transport Jack Chambers says the Government want to recruit gardaí and have a number of measures in train to try tackle rising road deaths.
"There are multiple factors which contribute to the increase in road fatalities," Mr Chambers said.
"Strengthened enforcement is a key focus for the Government and that's why a 20% increase in garda hours will help improve visibility and enforcement.
"But we're also working with the Commissioner and his team to ensure that we improve visibility and see strengthened enforcement from roads police units between now and Christmas."
