Are you allowed to start an overtaking manoeuvre in the situation shown?

In the photo you are driving in winter along a narrow road through a snowy forest behind a lorry; the lanes are separated by line P-3, which may be crossed from one side only - it is solid on your side and broken on the opposite side - and the shoulders are covered with snow. You are not allowed to start overtaking, because you would have to cross the solid line from its side. The answer is: no.

The Regulation on road signs and signals states that marking P-3 "line crossable from one side" means that you are not allowed to cross this line from the side of the solid line or to drive onto it, except when returning after overtaking to the lane you were in before; the Road Traffic Act also requires you, before overtaking, to make sure that you have adequate visibility and enough space to overtake without obstructing anyone. The solid line on your side closes the left part of the roadway to you - drivers from the opposite direction may cross this line and return, but you may not. In addition, there is snow on the roadway and a lorry that blocks your view of what is coming from the opposite direction. You stay behind it at a safe distance and wait for a long, straight section with a broken line on your side.

Legal basis: § 86 para. 4 of the Regulation on road signs and signals; Art. 24 para. 1 point 1 of the Road Traffic Act (Prawo o ruchu drogowym)