You clearly know nothing of the local geography and your arithmetic is wrong. 40 minutes for 28 miles works out at 42mph average, not 50-ish.
As I stated, much of my route consisted of unrestricted roads so 60 or 70 was quite legal and safe: now there are only short stretches at NSL and traffic calming measures (random central islands on what were 3-lane roads to make it hard to overtake slow vehicles).
The arithmetic was a quick guess but allowing for urban areas 50 between then isn't that far out. As a Yorkshireman I think I can be credited with some knowledge of the county.
While 70 (or more pre 1964?) might have been legal that doesn't make it safe on roads that roll and curve through moorland etc. The imposition of central islands and narrowings are usually a response to high accdent rates.
And you cannot refute the massive increase in traffic volumes over 55yrs.
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