ACT Fire and Rescue had to extract an injured man from his upturned car in Civic after his car plunged through a roadside barrier, flipped and dropped about 30 metres onto its roof in a construction pit.
The crash happened about 5.15 pm on Wednesday on London Circuit.
The car narrowly missed falling onto heavy machinery working on the site below.
A witness said that construction workers on site had rushed to the man's aid.
The man was taken from the vehicle, assessed by paramedics, and transported to hospital in a stable condition.
What caused the incident is not clear although police suspect the incident may have been caused by the driver having a medical condition.
The incident remains under police investigation.
