National speed factor sign?

Why is the national speed limit sign simply a white circle with a black queue through it and other speed limits are numbers such as 30, 40 and 50? Why did they establish not to just put a 70 sign or contained by some cases a 60 sign?

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Answers:    It's a throw back to the days previously we had national speed confines. The white circle with the black diagonal stripe actually medium a speed de-limited road, i.e. you could do whatever speed you considered necessary on that road.

The indroduction of speed limits within 1965 effectively made these signs obsolete but a bit than replace them their meaning altered to tight maximum speed limit.

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So that if the national speed closing date is changed the thousands of signs don't have to be replaced.

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