Head shape and body pattern led me to believe that it is a Rat Snake instead of a Racer.
Northern Black Racer:
Eastern/Black Rat Snake:
In reference to your painted turtle rescue, I have moved two off the road this year so far, one being quite a large (female?) today. I pulled a 3point turn and drove back and an SUV was heading toward it, and it was almost as if they tried to hit it. The turtle had to pull its head back into its shell, if it hadn't it wouldn't have had a head. I dislike people sometimes.
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