Which sign indicates that the only permitted directions and senses are straight ahead or turning left?

Question

DentroTest · Accepted Answer

The correct answer is This is a mandatory sign (circular with a blue background). These signs, belonging to the R-400 series, indicate the only directions and senses that vehicles must take. By showing arrows pointing straight and to the left, the sign prohibits taking any other direction (such as turning right).  In contrast, sign 1 is a warning sign (P-16a) indicating an intersection with priority over the road to the left. Sign 2 is a prohibitory sign (R-303) indicating precisely that turning left is forbidden.

Which sign indicates that the only permitted directions and senses are straight ahead or turning left?

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