Does the plate under this sign indicate the end of the road with dangerous bends?

Why?

Below the A-3 warning sign for dangerous bends is a T-3 supplementary plate marked “Koniec”, meaning “End”. It marks the end of the section affected by the hazard shown on the sign, which here is a series of dangerous bends.

§ 3 ust. 5 rozporządzenia w sprawie znaków i sygnałów drogowych, tabliczka T-3