(AP Photo/Wade Payne)

CHARLOTTE, N.C. (AP) NASCAR has changed the rules on its aerodynamic package for short tracks and road courses because the racing didn't improve at those venues under rules introduced last season.

NASCAR had been fairly adamant the rules package would remain unchanged but reversed course late last season when it was evident the racing clearly had suffered at smaller tracks. The most glaring issue was a ho-hum penultimate race at Phoenix Raceway, which this season will host the championship finale.

A week after the dud in Phoenix, NASCAR President Steve Phelps promised fans the sanctioning body was working on improving the racing at short tracks.

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