It looked like there was a snake crawling into my car barn.
It turned out to be a young corn snake or red rat snake (Pantherophis guttatus guttatus). (Yes, I learned the genus as Elaphe, also, but apparently it has been changed.) He wasn't moving.
It appears he was crushed by the door. Here's what I think happened: the crack he tried to enter by is very small and the door is very heavy. It was a windy day and I think the door shifted just enough to crush him. Snakes are delicate animals. The ribs are thin and they have only one lung, an adaptation to their geometry. Ribs can easily be broken and penetrate the lung, which results in death. This poor fellow needed a slightly larger opening.
The death is regrettable because these are valuable snakes. They eat mice and living here in the woods we have an abundance. The mice are forever invading our cars. Lift the hood (for our British friends, that's where we keep the motor) and you're likely to find a cache of acorns and the beginnings of a nest. One even made it into the heating/air conditioning ducts on one car and completely clogged it. A few rat snakes in the barn and that problem would be minimized. Besides, I think these corn snakes are attractive.