In the presented situation, can you enter the narrowed section of the roadway?

Why?

Sign B-31, 'Give priority to oncoming vehicles', prohibits entry if you would force an oncoming vehicle to stop. No such vehicle is visible in the photograph, so you may enter after checking that the passage is clear. The other signs also apply: actual total vehicle weight must not exceed 2.5 tonnes, and height including any load must not exceed 2.2 metres.

§ 25 oraz § 20 ust. 2 i 4 rozporządzenia w sprawie znaków i sygnałów drogowych, znaki B-31, B-16 i B-18