Anyone who may have witnessed the collisions, or has dash-cam footage from those areas, is asked to contact Gardaí.
Three women have been killed in separate crashes in Clare, Meath and Wexford.
Gardaí have today confirmed a pedestrian in her 20s, who was seriously injured in a collision with a car near Enniscorthy yesterday afternoon, has since died in hospital.
A cyclist in her 70s died following a collision with a tractor in Tulla yesterday lunchtime, while another pedestrian in her 60s was killed in Ashbourne yesterday evening.
Anyone who may have witnessed the collisions, or has dash-cam footage from those areas, is asked to contact Gardaí.

Sharp Rise In M9 Collisions With Garda Call-Outs Up Year-On-Year
Councillor Seeks Clarity On How Often Nightclubs and Late Bars In Naas Are Inspected For Fire Risks
New Figures From CSO Reveal How Much International Protection Applicants Earn Compared To Average Worker In Ireland
Unpaid Eight-Month Work And Training Placement For Adults With Disabilities Branded "Extremely Unfair"
Department Of Education Defends Kildare SNA Cuts Amid Claims Of Reduced Need At Some Schools
Naas Nurses Threaten Escalation As Staffing Row Deepens
Driving Tests Face Disruption As RSA Testers To Strike Next Week
Jury Delivers Not Guilty By Reason Of Insanity Verdict In Ballyfin Demesne Strangling Case