I was stopped at a traffic light near to an old railroad track and highway overpass. You have to look up while waiting for light to change while doing so object passed my line of sight. The object did not strike me as being an airplane or helicopter. The object appeared as silver disc with the bottom seeming flat. It motion was like when a plane passes you by while taking off or landing. For the few seconds object was visible I was struck with the thought what was that. The object passed behind a 2 story house which was few hundred feet from my location. It may have changed direction because further down the road you have a line of sight to the horizon.