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

In the photo you are driving a passenger car and approaching a narrow passage under a flyover, where the roadway narrows to one lane; on the right there are signs B-31 "priority for oncoming vehicles", B-18 (2.5 t) and B-16 (2.2 m). No oncoming vehicle can be seen under the flyover or beyond it, so you may enter the narrowed section. The answer is: yes.

The Regulation on road signs and signals states that sign B-31 prohibits drivers from entering a narrowed section of the roadway if this would force drivers who are on that section or approaching it from the opposite direction to stop; sign B-18 prohibits the movement of vehicles with an actual total mass of more than 2.5 t, and B-16 - of vehicles higher than 2.2 m. The red arrow on B-31 is your direction - the one that gives way; drivers from the other side see the blue sign D-5 and have right of way. The ban on entering applies only when someone is coming - since the passage is empty, you drive in, but slowly, ready to stop if a vehicle appears from behind the flyover. A passenger car is within both limits.

Legal basis: § 25 and § 20 para. 2 and 4 of the Regulation on road signs and signals