First of all, shutter speed was 1/6th, not unknown.
And secondly, I seriously sat here waiting for this shot for more than 15 minutes. I set up my tripod with my camera on it and pre-exposed some shots to get exposure correct and then I sat on the ground with my remote in my hand waiting for a truck to come across the bridge. I would love to read all of the comments that you want to leave saying that this shot isn't quite perfect, but I can assure you that it is. Originality, rule of thirds, proper exposure, proper shutter speed, proper aperture, perfect highlights, perfect shadows, creative idea, etc, etc, etc...
hehe, it's not perfect, too much sun there on bridge, but i relly did not noticed it then before I read it was 'perfect' :p you should have waited more than 15 minutes ;)
But why I do like this picture very much is not so technical, I like it becouse it 'twists' time of water and truck, becouse of that truck i can feel movment of water
nice capture. But i feel there is lot of disturbance on the bridge, plus the rock on the left side looks very prominent. I would suggest a bit of cropping as enclosed, hope you don't mind. Still, nice capture.