Highway 174 eastbound has reopened after a serious crash.
Ottawa Police say three vehicles rolled over near the Blair Road exit, causing significant delays and the closure of the eastbound lanes at the split.
Paramedics say they transported five people to hospital.
One man in his 20's was transported to the trauma centre with significant injuries to his leg.
The other four people involved each suffered minor injuries.
Police are seeking witnesses to the crashes.
If you have information, you're asked to call Ottawa Police at 613-236-1222.