Michigan State Police were dispatched to the Lodge Freeway near McNichols after reports that someone was running across the road. While en-route, they received a second call that someone had been struck be a vehicle in the left lane.
It happened around 11 p.m. in the northbound lanes, a tweet from police.
The individual has been identified as an 18-year-old man. It's unclear why he was on the freeway. He is in critical condition after being taken to a local hospital.,
The driver that struck the pedestrian stopped at the scene, police say.
Drugs or alcohol do not appear to be a factor.