YOU SAID:
I was in a car which was driving.
INTO JAPANESE
運転していた車だった
BACK INTO ENGLISH
Vehicle he was driving was
INTO JAPANESE
彼が運転していた車両だった
BACK INTO ENGLISH
The vehicle he was driving was
INTO JAPANESE
彼が運転していた車両だった
BACK INTO ENGLISH
The vehicle he was driving was
Come on, you can do better than that.