I used to fire away, but experience taught me that it actually resulted in missed opportunities. I would have a specific car in mind and shoot away as it passed, but now I can shoot multiple pans in the same group during a single pass - makes for a much more efficient and enjoyable day.

I like to compose my pans as best I can, use minimal clicks and bottom focusing to "keep the car on the ground". The pans above actually have very little cropping done.

I will post part 2 pics in a day or two, the rain made for some pretty cool shots.