In the presented situation, is the distance between the warning sign and the dangerous spot up to 100 metres?

In the photo you are driving through a section of road works; on the right there are signs A-20 "section of roadway with two-way traffic" and B-33 "40", and in front of you a lane separated by barriers leads onto the opposite roadway. Since the speed limit here is 40 km/h, the warning sign is placed up to 100 m from the dangerous place. The answer is: yes.

The Regulation on road signs and signals states that the distance of a warning sign from the dangerous place is from 150 m to 300 m on roads where the speed limit exceeds 60 km/h, and up to 100 m on other roads. The 40 km/h limit puts this section in the second group. Beyond the sign two-way traffic begins, so you keep to the right side and do not overtake.

Legal basis: § 3 para. 2 and § 10 para. 2 of the Regulation on road signs and signals