Great action capture. Good motion blur and perspective on the vehicle. Including the dust behind the racer in the composition is a good idea. Color and exposure are right and the image has no overexposed areas.
In some cases there will be voters that feel you are "shoehorning" this image into the "darkness" challenge but it really does fit it well if they opened their minds. Unfortunately there are some very narrow thinking voters out there.
On the technical side there is a lot of electronic noise that you should apply noise reduction to if you can.
Is this what darkness means to you? Really? Oh well, it is a great action shot and I don't want to score someone low because I don't see thier vision of darkness.