The source of light in this picture is the sun in the early morning.At this time of the day, the light is a cool white color with low brightness.The absence of sharp shadows suggests a cloud cover in the sky.The direction of light is from the low left, with most of the scene in shadow from the trees on the left side of the road.There is a high contrast in the scene with the bridge and trees making up the darks and the sky and the bridge support making up the lights.The overall mood of the scene is gloomy, suggesting bad weather.