Tractor tyres live in a peculiar legal twilight – not quite cars, not quite farm tools, and apparently exempt from the tidy rules that keep the rest of us in line. If your Fiesta tyres are down to the threads, you’ll get fined, lectured, and probably humiliated by the MoT man. But slap tyres smoother than a billiard table on a Massey Ferguson, lumber onto the A46 at 15 miles an hour, and the law just smiles indulgently, as though tractors are governed by some unwritten “Tread Depth Magna Carta” penned by a shepherd in 1743.
Car tyres have an exact figure: 1.6mm. Tractor tyres? Nothing. Just the vague instruction that they must be “in good condition,” which is bureaucrat code for “we’ll know it’s bad when it’s in pieces all over the road.” It’s rural common sense over regulation – a quick glance, a muttered “looks alright,” and that’s that.
But here’s the delicious irony: tractors have their own built‑in enforcement system. If the tread’s gone, they simply don’t work. The moment those tyres go bald, the tractor stops being a mighty tool of agriculture and turns into a several‑tonne ornament, wheels spinning helplessly while the farmer stares in frustration. Nature steps in where the law doesn’t – no tread, no traction, no ploughing, no point.
And yet, despite this, many tractors spend more time on tarmac than on soil these days – hauling hay, blocking roundabouts, and generally slowing Britain to a crawl. Shouldn’t that mean they play by road rules? Apparently not. Tractors exist in some parallel legal universe, where the tread is as undefined and mystical as Brexit’s “benefits,” and the only true law is that if your tyres are too bald, you’ll find out soon enough – stuck in a muddy field, going nowhere fast.



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