An Alpharetta woman driving on Ga. 400 in Sandy Springs was impaled in the neck by a railroad nail, police said.

Monica Mesa was on Ga. 400 just before Roberts Road on Saturday when a railroad nail came through the windshield, striking her in the neck, according to a Sandy Springs police report.

Mesa had passengers in the car, but she was able to slowly pull over and stop the car, Sandy Springs police spokeswoman Sgt. Forrest Bohannon told Channel 2 Action News.

None of the passengers was hurt by debris. Bohannon said police don’t believe the object was thrown by a person intentionally.

“We don’t know if it fell off a vehicle or if it was already in the roadway and was kicked up by a vehicle running it over,” Bohannon said.

An ambulance took Mesa to North Fulton Hospital and doctors operated on her to remove the nail, which police took as evidence. Co-workers told Channel 2 she was recovering and expected to be OK.

UPDATE: Sandy Springs confirmed Friday the object was a railroad nail.