https://www.volvocars.com/my/support/car/s80/14w46/article/3ddbe0c1c4422e98c0a801e80149382a/2ce306f983858535c0a801e801f47d55/f5eee1abf78d301ac0a801e800e88623/
Volvo Support for S80 Tyres - tread wear indicators | A tread wear indicator shows the status of the tyre's tread.
wear indicatorstyrestreadvolvosupport