Large multi-fixture highway lighting.
I think I may have posted something similar back some time ago...but it was just right there & I had the camera in my hand LOL
I didn't even have to see the description to know where this was, I've been past the US 285 and C-470 intersection so often that I know these high-masts by heart, so just seeing the picture on the thumbnail on the main page I knew exactly where it was. And they are unique compared to the other ones in the Denver area.