FALMOUTH — A Westbrook woman, whose flat tire had just been fixed by a tow truck driver, was seriously injured Wednesday morning in a two-car crash at mile marker 54 on the Maine Turnpike in Falmouth.

The crash, which happened about 10:30 a.m., forced police to shut down both northbound lanes for three hours while rescue and wrecker crews responded.  During that time northbound traffic was diverted to Exit 53 in Portland.

Steve McCausland, a spokesman for the Maine Department of Public Safety, said the woman, 73-year-old Wanda Brochu, pulled her vehicle into the path of a pickup truck after having a flat tire fixed in the breakdown lane.

Brochu was trapped in her vehicle until firefighters could extricate her, police said.

Brochu was listed in satisfactory condition Wednesday night at Maine Medical Center in Portland.