121-20
Sign 121-20: Road narrows on the left

Explanation
The road narrows from the left. Expect vehicles to move over from the left or merge into your path, and adjust your speed.
Back ←Where you learn this sign
Lesson L09 · Road use & lanesLanes, markings, special paths↗Lesson L20 · Roundabouts & narrow passagesRoundabouts and narrow passages↗Lesson L21 · Warning signsRoad layout↗Similar signs to tell apart
Road marking 297: Lane arrows
Road marking 297.1: Advance warning arrow
Road marking 340: Broken lane line
Road marking 295: Solid line (lane or edge line)
Road marking 296: One-sided solid line
Sign 245: Bus lane
Sign 237: Cycle pathTest yourself on these signs
A one-minute drill: pick the right meaning for each sign.
Legal basis: § 40 StVO