The fact is you or most of us dont notice the sound of a normal cars tyres, the big old Mud terain track edge type of army coming to town grumble is more defined. But if you start to take note of cars passing individualy especially if your in a quiet place, you will realise just how noisy car tyres are.
The Busy highway at a distance background" Whoosh"or "Hiss" if you like is clearly audible when the world gets moving first thing in the morning.
I live in a rural area, and i hear my neghbours Car tyrres in the quiet of a morning long before i hear the 2litre audi TDI. if its windy or brease from certain directions you are not forced to notice it , but in a still quiet morning or at dusk say, its noticeable.
Noise is like light polution you live in it constantly, its just background, but when you are away from it the silence is as they say deafening.
I remember during covid 19 first lockdown, even out here it was very quiet, loudest things were the crows calling, pigeons etc, at dust after the blackbirds had stopped singing it was eerily quiet.