Firefighters from Westport and Norwalk rescued a driver trapped in a car that tumbled down an embankment off the Merritt Parkway during Wednesday afternoon rush-hour traffic.

The incident, reported shortly after 4 p.m., involved a Nissan Sentra that left the highway between northbound Exits 41 and 40, skidded down the embankment at the side of the road and struck a tree, entrapping the driver.

Firefighters from both departments were dispatched to the scene, along with emergency-medical crews and State Police.

The car was secured using a winch system and the driver was freed from the wreck by firefighters using a chain saw.

The victim was placed on a backboard and secured by a collar, then pulled up the embankment using a stokes basket, according to firefighters.

The patient was transported to Norwalk Hospital for treatment of what firefighters said appeared to be minor injuries.

The last fire units cleared the scene about 4:45 p.m.