Video roughly measuring the sound pressure level (SPL) of a Model 3 on a smooth highway as ~68 decibels (dB).
This is not a scientific test and the absolute value of the measurement is not particularly useful on its own. It is useful to compare with other videos in the series to get an idea of the relative increase or decrease in dB between vehicles, road conditions, and speed.
Measurements are taken with a Radioshack sound level meter set to A-weighting and slow response.
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