Rain in the desert won't be the biggest problem NASCAR faces today in Las Vegas. The real problem: wind.
Scattered showers are easier to deal with than sustained winds of 30 mph and gusts of 40 or faster. Aerodynamics are a huge part of stockcar racing. This year's changes to lower downforce are an ongoing experiment for the sport.
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So when Kurt Busch leads the 39-car field to the starting line at Las Vegas Motor Speedway, every driver will have a major question in mind: How will my car handle in the Kobalt 400?