There was a loud bang as we drove around the M25.
I was already about to pull from Lane 2 into Lane 1, ready for an upcoming junction.
Yes, a high speed blowout of a front tyre. I remembered that thing about not braking but instead letting the car slow down as I indicated my way onto the hard shoulder. Also about parking diagonally with the wheels facing away from the traffic, so that I could get out of the driver door onto the hard shoulder instead of towards oncoming 70 mph traffic.
Hazard lights and all other lights on. Check for a safe place to stand behind the barrier.
I looked at the dead tyre. Behind it was a piece of wood with some nails. It may have been coincidence. High speed blowouts are usually caused by under inflation, kerbing the tyre or some catastrophic damage. I suspect the last case.
The tyre was well and truly popped. Time to call the AA and the very nice rescuer was along speedily to fix everything. Space saver tyre from the boot, torque wrench, correct inflation. And then we were back on our way at a maximum speed of 50 mph.
Later I was along at the tyre place and they read out the treads from my tyres. All six and seven millimetre, so plenty left, well above the three millimetre that I usually consider minimum.
Did I want to see the old tyre? Not really, although I'm pleased it was premium and kept me in a straight line.