What obligation does this circular blue sign with the number 30 impose on the driver?

Question

DentroTest · Accepted Answer

This is the R-411 (Minimum speed) sign. In road safety, a circular shape with a blue background always indicates an obligation. Therefore, this sign compels drivers to travel at least at the speed indicated by the figure (30 km/h) from where it is located until another sign indicating 'end of minimum speed' or 'end of prohibitions' cancels it.  It is important to distinguish it from: Prohibition signs (red border): Indicate maximum speed. Indication signs (square): Indicate recommended speed.

What obligation does this circular blue sign with the number 30 impose on the driver?

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