Bright green, a bit of an odd color choice to paint metal girders underneath a freeway bridge. And yes, in case that first sentence did not clue you in, this view is looking straight overhead and the underside of the bridge.
EXIF data: Nikon D7000, center weighted metering mode, ISO 100, 30mm, f/8, 1/4 sec
Sacramento, Green Girders, Freeway Overpass. Sacramento, California. September 22, 2013. © Copyright Steven Tze – all rights reserved.