Andy! i was going to say what a great shot even before I read the description.. from a moving car? even more fantastic! I luv the lines in the photo too (fence and hydro structure)"The poetry of photography will always be more important than the mechanics of the camera..." - J-H. Lartigue
Great shot Andy, have you tried a noise reduction program on it? it might just clean up the sky and give it even more punch....a lovely shot either way.
You don't take a photograph, you make it. - Ansel Adams