Road and traffic signs

What does this blue sign mean?

You must keep to at least 30 mph
Correct
Maximum speed 30 mph
Recommended speed 30 mph
End of the 30 mph limit

Why?

A blue circle gives a compulsory instruction. Here it sets a minimum speed limit, so you must not drive slower than 30 mph unless road or traffic conditions make it unsafe.

Highway Code rule Traffic signs

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What does this blue sign mean?

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