It's always interesting to see another way of looking at a scene. I must say cars probably wouldn't have struck me as a likely subject!
Have you got a 77mm R72 filter for the D70? You're not using a
modified camera are you?
Looks like you did a reasonable job on the focus, which is impressive given the above. Similarly keeping the car in the frame would have been a challenge, which I'm guessing is why you were shooting at the wide end of your zoom!
But shooting at ISO 800 and then boosting exposure in ACR by 1.8EV hasn't done a lot for the quality. These get very "pasty" towards the right.