Are you allowed to continue driving straight on the current lane if there are no other vehicles on the right half of the road?

In the photo you are driving in the left lane of a wide street in a town; in front of you there are signs A-20 "two-way traffic section of the roadway" and B-23 "no U-turns", and on the left, next to a traffic island with signs, an area closed to traffic has been painted. You are not allowed to continue straight on in your current lane. The answer is: no.

The Regulation on road signs and signals states that sign A-20 "two-way traffic section of the roadway" warns drivers on a one-way roadway about the place where two-way traffic begins. Until now the whole roadway was for your direction, so you could drive in the left lane; beyond the sign the left part of the roadway becomes a lane for vehicles coming from the opposite direction. Driving on in the left lane would therefore mean driving against the traffic, head-on into oncoming cars. The Road Traffic Act requires you to drive as close as possible to the right edge of the roadway and on the right-hand side, so in good time - before the place where two-way traffic begins - you switch on the right indicator, check the mirror and the blind spot and move into the right lane, giving way to vehicles already in it. Sign B-23 reminds you that U-turns are prohibited here.

Legal basis: § 10 para. 2 and § 22 para. 5 of the Regulation on road signs and signals; Art. 16 para. 1 and 4 and Art. 22 para. 4 and 5 of the Road Traffic Act (Prawo o ruchu drogowym)