A side effect of prefocusing is that most P&S cameras will preset exposure as well. Ideal exposure with a reflected light meter is obtained when the subject reflectance is 18% gray (a medium gray).
Locking focus locks exposure too: By prefocusing on our nearby subject, then recomposing, camera fired just a hint of fill flash, keeping nice detail in the face, and making for a sharp subject rather than a sharp background.
All SLRs are autofocus and while AF can work, you may prefer setting focus to manual and taking control. One technique to try is prefocusing, where you focus on a particular spot on the road and take the shot just as the racer reaches that point.
 See also: Camera, Manual, Focusing, Zoom, Shutter
  
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