What does this vertical marking indicate?

Question

KET Užduotys · Accepted Answer

Correct answer: Marker posts and barriers.. Explanation: Vertical marking made of a wide diagonal black stripe is used to mark objects close to the carriageway — such as marker posts, barriers or guardrail supports — so that drivers can see them better.. KET reference: KET 3 priedas 2.4: A wide diagonal black stripe marks marker posts, barriers, fence (guardrail) supports and the like.