The M50 northbound has now reopened after a serious crash earlier this morning.
A series of collisions involving a military convoy on the motorway left 28 soldiers injured and closed the northbound lanes to traffic.
Three military trucks and two private vehicles were involved in the crash.
All of the soldiers received minor injuries and they have now been released from hospital.
Eight ambulances were called to the scene and the injured were taken to five different hospitals in Dublin.
The collision occurred at the Ballymun exit on the M50 shortly before 11am.
The soldiers' organisation PDFORRA has called for a full investigation into the crash.
Simon Devereux, Deputy General Secretary of PDFORRA, said the trucks had no safety devices such as seat belts and they want the military authorities to stop using the trucks until they are put in place.
Gardaí and the Defence Forces will each be conducting investigations.
The troops were part of a nine vehicle convoy that departed Cathal Brugha Barracks this morning with 75 personnel for an exercise in the Cooley Mountains, Co Louth.
It is understood that safety concerns had previously been expressed by soldiers about the lack of roll bars or other protection on these army trucks.
In June 2007, 12 members of the Defence Forces were injured following an accident while travelling in the rear of an army truck in Granard, Co Longford. As a result, the Defence Force says it is procuring Roll-Over Protection Systems, including safety harnesses, for over 150 such trucks. But the plan is still in the early stages.
