Eric Williams was flown Masaschusetts General Hospital on Friday afternoon after being ejected from the vehicle he was driving.
Williams’ Jeep Wrangler struck a fire hydrant and rolled over in the area of 111 Broad Street in Whitman, shutting down the road for more than two hours.
Two others, including the teen’s brother, Dylan Williams, and Brendon Lever, also of Hanson, were ejected from the vehicle, but were not hurt.
None were wearing seat belts.
The Jeep struck and sheared off a fire hydrant, rolled over and landed on the driver side.
The cause of the crash remains under investigation.