In this scenario, are you allowed to begin the overtaking manoeuvre of the preceding vehicle while exercising extreme caution?

Why?

The A-1 sign warns of a dangerous right-hand bend, and double solid centre lines are visible ahead. In this situation, there is not enough room to complete the overtake safely before that section. You must not overtake the car on the signed bend by crossing the solid lines into the opposing lane, even if you take extra care.

art. 24 ust. 1 pkt 1, ust. 7 pkt 2 i ust. 8 pkt 2 Prawa o ruchu drogowym; § 86 ust. 5 rozporządzenia w sprawie znaków i sygnałów drogowych