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The straps were there long before KERS. GH85 is correct- it is for static electricity discharge.
Air moving over the car at 200 mph will do wonders to develop an electrostatic charge on the outside of the car.
Carbon fiber is electrically conductive. Pretty highly so. I once had to tac weld a steel wing mount in place for jigging on a carbon fiber rear wing. I had the ground for the TIG placed up high, near the wing. When I switched sides and got the torch near the underside of the wing, the arc jumped from the steel jig to the wing and the entire thing lit up like a christmas tree. Much like a CD in a microwave. No damage was done, but it startled the **** out of me..
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