Minister of State at the Department of Transport, Mr Ivor Callely, will seek to have safety barriers in place along the middle of the M50 "within weeks".
He made the commitment yesterday evening after the death in hospital of a 22-year-old Dublin woman involved in last weekend's three-car pile-up on the motorway.
"First and foremost my thoughts and deepest sympathies are with the young woman's family, and with those still injured in hospital," said Mr Callely. "But I must say that following urgent discussions with Department officials, who have been in touch with the National Roads Authority, we will be putting safety barriers, even if only temporary at this stage, in place along that route within weeks."
Six other people were injured in the crash, which occurred on the motorway between Blanchardstown and Finglas last Sunday.
The woman, whose name has not yet been released, was the driver of a car travelling northbound when a car coming in the opposite direction crossed the central reservation and crashed into her car and another car. It is believed the dead woman was from Dublin.
Separately, a man in his 50s died after he was knocked down by a car near Coachford in Co Cork in the early hours of yesterday morning.
The accident happened at Nadrid at around 1.30 a.m. A man was arrested in connection with the incident and later released. The collision brings to 346 the number killed on Irish roads so far this year, compared with 318 at the same stage last year.
A report into the instance of late-night road accidents, originally due in September, is set to be presented to the Minister for Transport, Mr Cullen, before Christmas.