For the record
Roadkill. Did not have a tape, but it was about five feet long. There are not any Gray Ratsnakes within 100-150 miles of this location, and in agreement with Maryland DNR, this is most appropriately considered an Eastern Ratsnake; https://dnr.maryland.gov/wildlife/Pages/plants_wildlife/herps/Squamata.aspx?SnakeName=Eastern%20Ratsnake