German traffic sign 157-21, officially 'Dreistreifige Bake mit Entfernungsangabe – Aufstellung links', is a crucial danger warning sign. It prepares you for an upcoming railway crossing by indicating your distance to it. This left-mounted version is placed on the driver's left side of the road. You must prepare to reduce speed and be ready to stop well before reaching the tracks, combining this visual cue with other road markings and signals.
German road sign 157-21, the three-stripe distance marker installed on the left, signals proximity to a hazard, requiring immediate attention and speed adjustment. Mastering this road sign meaning is crucial for your German theory test revision and ensuring safe driving practices.
German road sign 157-21, officially designated "Dreistreifige Bake mit Entfernungsangabe - Aufstellung links", belongs to the danger warning signs group. It prepares the driver for a railway crossing sequence, where speed, observation, and stopping readiness must be planned well before the tracks. You may see it in approaches to hazards, rural roads, urban conflict points, railway crossings, roadworks, and weather-sensitive sections, depending on how the road authority has arranged the location. This left-side version is used where the sign is placed on the left side of the carriageway or where a mirrored symbol fits the approach direction. Any left reference should be read as part of the direction, road side, lane arrangement, or placement shown by the sign. The practical meaning is not just the symbol itself, but the driving decision it triggers: adjust speed, position, priority, route choice, stopping behaviour, or attention before the situation becomes urgent. For learners, the key skill is anticipating what could go wrong before the hazard is visible. Always combine the sign with road markings, traffic lights, police instructions, and any supplementary plates at the same location.
German road sign 157-21 means "Dreilanee distance marker board with Entfernungsangabe - installed on the left" and is officially listed as "Dreistreifige Bake mit Entfernungsangabe - Aufstellung links". In practice, it tells drivers to recognise the situation early, adapt before reaching the controlled area, and check whether markings or supplementary plates change how the rule applies.
Get clear, practical answers to the most common questions about the 157-21 - Dreilanee distance marker board with Entfernungsangabe - installed on the left road sign. Learn how the sign works, what rules it represents, and how it affects real driving situations. This FAQ strengthens your understanding and supports accurate decision making for the German driving theory exam in Germany.
Sign 157-21, the Dreilanee distance marker board installed on the left, warns drivers of an approaching railway crossing. The number of red stripes on the board indicates the distance to the crossing, with three stripes meaning the crossing is still some distance away. It's a crucial signal to prepare for potential stops and check for trains.
When you see sign 157-21 on your left, you should immediately acknowledge it as a warning for a railway crossing ahead. Begin scanning for the crossing itself, and be ready to adjust your speed. You need to plan to slow down and stop before the tracks if necessary, so it's wise to increase your awareness and potentially reduce speed early.
The core meaning of warning about an approaching railway crossing remains the same. The difference lies in their placement: sign 157-21 is installed on the left side of the carriageway, while a corresponding sign on the right would be on the right side. Always observe the placement to understand which side of the road the warning is coming from and how it relates to your lane.
A common exam trap is not understanding that this sign requires proactive preparation. Learners might mistakenly think they only need to react when they see the tracks themselves. Remember, the purpose of this sign is to give you advance warning, so you must prepare to slow down and observe much earlier than the immediate hazard. Always consider combined signals and road conditions.
Yes, supplementary plates or additional road markings can significantly refine the meaning of sign 157-21. For instance, a plate might specify the exact distance in metres, indicate a specific type of crossing, or warn of additional hazards. Always read any accompanying signs or markings carefully in conjunction with the main warning sign.
A clear reference image of the 157-21 - Dreilanee distance marker board with Entfernungsangabe - installed on the left road sign used in Germany.

The 157-21 - Dreilanee distance marker board with Entfernungsangabe - installed on the left road sign may also be known by these alternative names or terms.
The 157-21 - Dreilanee distance marker board with Entfernungsangabe - installed on the left road sign is part of the German Danger Warning Signs category, which groups together signs with similar rules and functions.
Comparing similar road signs, like this left-mounted distance marker board, sharpens your recognition skills for the German theory test. Understanding the subtle differences between related traffic signs is crucial for accurate recall and fewer errors during your exam preparation.

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Deepen your understanding of specific road sign categories or test your knowledge with practice questions. Explore our themed sign groups for targeted study or jump into quizzes to reinforce your recognition skills for the official German theory exam.
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