Road closed between Longford and Newtiownforbes
Update: A 23-year-old woman has been airlifted to Beaumont Hospital in Dublin following the serious collision in Co Longford.
The incident occurred on the N4 at Lamagh shortly after 3pm.
A garda spokesman said a woman in her 50s was arrested at the scene of the crash.
The road has been closed on the Longford town side of Newtownforbes.
Diversions are in place and a forensic collision investigator is en route to the scene.
Also read: Gardai issue warning about deer hazzard
Subscribe or register today to discover more from DonegalLive.ie
Buy the e-paper of the Donegal Democrat, Donegal People's Press, Donegal Post and Inish Times here for instant access to Donegal's premier news titles.
Keep up with the latest news from Donegal with our daily newsletter featuring the most important stories of the day delivered to your inbox every evening at 5pm.