One man lost his life in the tragic incident.
Gardaí are renewing their appeal for witnesses to a fatal crash in Westmeath.
A man in his 20s died in the collision on the N4 at Ballinafid at around 9.30 on Friday morning.
Three other men are still being treated in hospital.
Anyone who was travelling on the Mullingar to Longford road around the time of the incident is being asked to contact Mullingar Garda Station.