In this situation, are you being warned of a road narrowing on the left?

The yellow warning sign visible on the right side of the road is sign A-12c 'roadway narrowing - left'. The graphic on the sign depicts a narrowing of the road from the left (the left line is bent inward, while the right is straight), which clearly informs about a narrowing occurring on that side. According to § 7 para. 3 pt. 3 of the regulations, this sign warns of a roadway narrowing, which may be caused, for example, by roadworks indicated by a sign placed below.