The message Here is an intrepid racer, braving the elements in pursuit of his sport. The rain is apparent in the general wetness, the trails of water from the car, and the gloomy light. Great title.
Creative choices Shooting in the rain made for a much more dramatic image than a similar one taken on a nice day would have been, both in the message and the quality of the light. The colors are great; the subject stands out nicely from the background. The motion blur combines with the DOF blur to make the background unobtrusive yet distinguishable enough to give context to the picture. A bit more motion blur would have given an impression of faster speed, but that wasn't the main intent of the photo and a longer exposure would have also made the engine more blurry, so I think the motion blur is just right. The composition is too tight, which makes the photo a bit boring. Some open space to the left would add some excitement, and some space above would provide better balance.
Technical aspects Panning is well done. Focus and exposure are great. The white balance seems slightly off, giving a very minor color cast.
Another vehicle shot. I dont really know why but you havent really managed to portray speed if that was your intention. Great crisp focus on the (slow?) moving subject pity the weather want a bit better.