Alright so I looked up how to attack these shots on my iphone while I was riding with Greg on our way to VIR this weekend. They are tricky! The whole long exposure and keeping fast moving cars in focus pretty much comes down to luck and a steady hand. It also sucked that the clouds were so random it went from light to dark every couple seconds it seemed like.
The trick is:
Low ISO (100-200ish)
High F stop (9-14)
Exposure at 1/60th to about 1/180th
Increasing the exposure bias helps too (I used +2.3 sometimes)
I am a digital photographer in Richmond, VA. I love to capture things the way they are and show the world. 95% of my work is straight off the camera. My specialty is automotive, however I will capture anything. Email for more info!
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