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If the memories from my youth are anything to go by, very fast.
I remember my driving instructor telling me that when you got onto the national speed limit country roads that you had to show the examiner that you were aware there was a higher speed limit, i.e. floor it.
Mine too, and she was an ex Copper. Drive to the Speed Limit when it was safe was the advice.
I guess that keeping speed to the traffic around you stops others from swerving into other lanes.
When driving over the M62 the fog/mist/clag on the Saddleworth Moor area does justify a 40mph speed, however.
I googled it, and surprisingly few road deaths come on motorways.
Total road deaths in the year were 1460.
Apparently most fatalities come on country A roads and B roads. Hard to find information on what speed people are going on those cases.