A good long exposure makes for a great picture. And if you take the shot in the right light, it can become magical. Take Paul’s long exposure of traffic along the George Washington Parkway. We see traffic coming and going; the white of the oncoming lights and the red of the receding ones. But in addition to the artificial light, there’s the wonderful purple and oranges of the evening sky. Such a mixed lighting situation can be difficult to capture in a photo, because the lights of the traffic are not as bright as the light of the sky. But Paul used a neutral density filter, which reduced the overall light of the scene and allowed him to keep the lens open longer. Thus those near perfect lines of traffic and a gorgeous sky. Well done!