Ball of Green Light-Sydney Harbour07/09/2014

Whilst travelling along the Cahill Expressway southbound towards Sydney CBD I saw a ball of green light very quickly fall from the sky and disappear behind buildings about the location of Sydney Harbour just West of the Sydney Harbour Bridge, in front of Milson's Point. The object looked somewhat like a flare although not quite as bright and moved way too quickly. Ruling out reflections of the Green lane makers on the bridge because i was not yet on the bridge or the ramp leading to he bridge nor was i near any traffic signals. Very strange. I did not notice anything strange around the harbour apon crossing the Harbour Bridge or again crossing the Pyrmont Bridge and ANZAC Bridge.