Gah, driving back from the bike shop today, 60mph limit, admittedly some snow had fallen but not really, none on the roads, verges and hedges dusted but still >90% green/brown rather than white. None falling at the time, roads not even wet, can maybe see sense in doing 50mph or so rather than sitting on the limit.
So I've no idea why the person in front felt that 30mph was
too fast and jumped on the brakes everytime they reached it
And then of course they still stayed at 30mph through the 30 limit sections. Odd.
And no, I wasn't tailgating and therefore inducing the braking, I was a good distance back.