Two workers of an Ontario Ministry of Transportation subcontractor were injured, one critically, after being hit by the driver of a vehicle early Sunday morning in Bradford.
The collision happened just after 7 a.m. on Highway 400 southbound at Fifth Line.
According to the OPP, two workers were standing outside their vehicles following an earlier single-vehicle collision when a passenger vehicle entered that closed crash scene and struck one of their "blocker" trucks.
The driver and passenger of that vehicle were taken to a local hospital with unknown injuries, police said.
ORNGE air ambulance told CP24 that they transported one of the workers, a woman in her 20s to a trauma centre, around 7:45 a.m.
The gender and age of the other worker is still not known.
One of the workers is currently in life-threatening condition, while the other is now listed as being in stable condition with serious injuries, the OPP said in a tweet.
Highway 400 southbound was closed from highways 88 to 8 (Canal Road) for several hours as police investigated, but has since reopened.