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In the snowy winter of 1981, I drove up to Oxford to fetch Mrs S (to be, as she was then) home from Uni for Christmas. The M40 was under 8" of that "dry" kind of slush that's like Demerara sugar. When I got to the roundabout at the end of the M40 at Uxbridge (this was long before there was an M25 round there) I realised I couldn't steer round the roundabout - I just couldn't turn the steering wheel enough.
Close examination of the front wheels gave the answer. The entire void of the wheel arches of my car were full of impacted slush, and the front wheels literally couldn't turn.
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