This roof flap is a design meant to help cars remain stable even in a spin-out. Previously, Nascar vehicles risked taking air if they spun out at full-speed, and while that's still a danger, the roof flaps are meant to help reduce that risk.
Road Trip 2013
July 31, 2013 4:00 AM PDT
Photo by: Daniel Terdiman/CNET
| Caption by: Daniel Terdiman
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