A good Samaritan who stopped to help at a crash on the highway in Fairfield early Saturday morning was struck by another vehicle and was taken to the hospital.
Firefighters initially responded to a two-car crash on the Merritt Parkway in front of the northbound rest area.
Fire officials said a good Samaritan pulled over to help someone who had been injured in the crash and was struck by a third vehicle.
A total of five people were transported to area hospitals with various injuries. Investigators did not release details on the severity of those injuries.
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Drivers are reminded to use extreme care on limited access highways after a crash.