Researchers do not yet understand the precise roots of highway noise but suspect that tread grooves funnel air, thereby acting like tiny pipe organs, or that they vibrate at noise frequencies when they strike or peel away from pavement.

• 研究人员目前还不知道高速公路噪音的真正成因，不过他们猜测，可能是胎面的沟纹汇聚空气，就像是微小的风管一般，也可能是沟纹碰到或离开路面时，以噪音频率振动而发出了声音。