121-10
Sign 121-10: Road narrows on the right

Explanation
The road narrows from the right. If you are on that side and must move left to pass, let oncoming traffic go first (§ 6 StVO).
ⓘ Obstruction on my side = I wait.
Back ←Where you learn this sign
Lesson L20 · Roundabouts & narrow passagesRoundabouts and narrow passages↗Lesson L21 · Warning signsRoad layout↗Similar signs to tell apart
Sign 215: Roundabout
Sign 205: Give way
Sign 208: Give way to oncoming traffic
Sign 308: Priority over oncoming traffic
Sign 120: Road narrows
Sign 121-20: Road narrows on the left
Sign 123: RoadworksTest yourself on these signs
A one-minute drill: pick the right meaning for each sign.
Legal basis: § 40 StVO