Small black and grey snake [Northwest Connecticut]

Hello all, this is my first post here, so nice to meet you!

As I was walking yesterday I came across this snake on my road, so I tried to move it so it wouldn't get crushed by a car. It was kinda aggressive so I left it alone. I've been trying to figure out what it is, but little luck.


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EDIT:

Thanks for answering! I'm glad to know what it is if I see it again.

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