Capturing movement with blur

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usually blur is undesired in photography, in this instance I have tried to capture a sense of movement by using blur. This particular photo was t

aken at the car traveling at high speed on the duel carriage, to avoid capturing to much blur (which would have caused the photograph to be just one big blur) I had to travel in another car along side the one situated in the image. i feel that this technique really worked well as the car can be clearly seen but there is still a sense of movement. The cocktail of green blur in the background highlights the car.