Does the board under the prohibitory sign indicate the length of the road on which the prohibition is binding?

Why?

Below the B-36 no-stopping sign is a T-20 plate showing “100 m” with two upward arrows. It means the restriction applies for 100 metres from the sign, rather than starting 100 metres ahead.

§ 15 ust. 5 pkt 1 rozporządzenia w sprawie znaków i sygnałów drogowych, tabliczka T-20