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Figure 3


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Change of sound level LA5 relative to the reference levels. Top: Exterior. Bottom: Interior. Black filled symbols: LA5 differences determined from the measured data. Orange symbols: Predictions obtained for the difference between peak level and ambient level based on the model from [4] using our groove parameters. Blue symbols: Peak level differences as obtained in [11]. Note that for the latter the rumble strip design closest to the published ones was chosen.

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