The first start of the day. The temperature is barely above zero. I turn the key, and the PACCAR MX-13 coughs once, then settles into that steady low rumble only a real long-haul truck can make. The dashboard glows red,
If you’ve ever crouched next to your car and squinted at the jumble of letters and numbers stamped into a tire’s sidewall, you might have thought it was meaningless alphabet soup. It’s not. Those codes are the tire’s passport: a