Harris County Precinct 4 Constable's Office officials think the victim was hit around 3am in the 23200 block of Aldine Westfield near Ciderwood.
A passerby found the man next to the road in a tire display in front of a garage business. They believe he had been there several hours. He was still alive and was rushed to Ben Taub General Hospital.
At last check, the victim was in critical condition.
Authorities say they found some car parts near the crash to help them identify the vehicle.