nice effort. to make this better, you could: make it larger (640 on its longest side), make the car off center, catch more of the front of the car. the nice thing is, all you have to do is wait every 30 seconds for another one to come by...
This image is way too small to really judge well, though it looks like a great action shot. Try to make your submissions around 620-640 pixels wide or tall, whichever is the longer dimension. If you need more help PM me or ask on the forums.
Please use Photoshop or your photo editing program to make the photo 640 pixels on the long edge, then optimize for the web at 150k. Tiny pictures are hard for us to judge, and you will get alot of 1s from people who don't bother with small photos. It looks a bit blurry to me, use a faster shutter speed since you're in bright sun.