Is it actually caused by the tyres or is it the flow of air under the car?
It happens to EV’s so likely not engine noise related.
As it sounds different on different surfaces why aren’t all roads designed to reduce what is effectively noise pollution?
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>Is it actually caused by the tyres
Yup.
Though of course there’s also wind noise happening at the same time, usually.
>why aren’t all roads designed to reduce what is effectively noise pollution?
Because we care more about designing roads to maximise grip and reduce deaths from multi-car pileups and/or simply sliding off the road or into opposing traffic when cornering.
Turns out gripping and letting go of the wheel tends to make the noise caused by gripping and letting go of the wheel.
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