The man, whose name has not been released, was crossing the London Turnpike by Stanton Elementary School around 6:30 a.m. in Norwich when he was hit, police said.
Members of the East Great Plains Fire Department who happened to be passing by the area at the time of the crash were quick to begin life-saving measures on the man, Norwich Police said.
Paramedics took the man to W. W. Backus Hospital, where he remained in critical condition Wednesday evening, police said.
An initial investigation found that the man ran in front of the vehicle causing the crash, Norwich Police said.
The wreck remains under investigation.
Click here to follow Daily Voice Hebron-Marlborough and receive free news updates.