The only way I know of to do that kind of time photography on the computer would be to take a picture of the empty road and then draw in the lights. Like Zeissman said it's more trouble than it's worth. If I'm not mistaken your camera's speed will go as slow as 1/2 sec. so you could get some motion blur, but not as much as you're talking about. One other thing to consider is that you might start getting a lot of noise (like grain) in your picture with slow shutter speeds. Some of the newer cameras have noise reduction modes, or you could take an extra picture at the same settings with the lens cap on and composit the two together in Photoshop to subtract it, but this site doesn't alow that kind of manipulation.
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