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German Road Signs and Traffic Sign Meanings

Sign 157-21: Left-Side Distance Marker Board Warns of Railway Crossings Ahead

157-21 - Dreilanee distance marker board with Entfernungsangabe - installed on the left German road sign meaning

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.

Understanding the Left-Mounted Three-Stripe Distance Marker

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.

Definition of 157-21

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.

Meaning of 157-21

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.

Allowed actions for 157-21

Reduce speed early enough to keep full control before reaching the hazard.Scan both sides of the road, mirrors, lanes, shoulders, and crossing areas for the risk shown by the sign.Increase following distance and be ready to brake smoothly if another road user reacts suddenly.Choose a lane position that leaves safe clearance from the warned danger while staying within your lane and markings.Continue only when your speed and observation match the hazard, road surface, and available sight distance.

Prohibited actions for 157-21

Do not treat the warning as optional or wait until the hazard is directly in front of you.Do not overtake, accelerate, or follow closely when the sign points to reduced visibility, unstable road surface, crossing traffic, or vulnerable road users.Do not assume the danger is limited to the exact sign location; it may begin shortly after the sign and continue through the affected section.Do not ignore weather, darkness, traffic density, or roadworks conditions that can make the warned hazard more serious.

157-21 - Dreilanee distance marker board with Entfernungsangabe - installed on the left road sign FAQ

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.

What does the Dreilanee distance marker board (157-21) signify?

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.

How should I react when I see sign 157-21 on the left side of the road?

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.

What is the difference between left and right-sided Dreilanee distance marker boards?

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.

Are there any specific exam traps related to sign 157-21?

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.

Can supplementary plates affect the meaning of sign 157-21?

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.

157-21 - Dreilanee distance marker board with Entfernungsangabe - installed on the left road sign image

A clear reference image of the 157-21 - Dreilanee distance marker board with Entfernungsangabe - installed on the left road sign used in Germany.

157-21 - Dreilanee distance marker board with Entfernungsangabe - installed on the left road sign

Other names for the 157-21 - Dreilanee distance marker board with Entfernungsangabe - installed on the left

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.

German road sign 157-21German traffic sign 157-21StVO sign 157-21Dreilanee distance marker board with Entfernungsangabe - installed on the left signDreistreifige Bake mit Entfernungsangabe - Aufstellung linksdanger warning signs 157-21

German Danger Warning Signs road sign category

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.

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