The A18 'Two-way traffic' sign is a crucial Danish warning sign alerting you to upcoming two-way traffic. It prompts you to reduce your speed, widen your observation, and prepare for potential oncoming vehicles, especially if road width, visibility, or grip conditions change. Understanding this sign helps you maintain control and safe distances, preventing risky manoeuvres like overtaking.
Mastering the interpretation of the Two-way traffic sign (A18) is crucial for safe Danish driving and passing your theory test. This Danish warning sign requires drivers to anticipate upcoming changes in traffic direction and adjust their driving behaviour accordingly, a key element in road sign meaning and traffic sign explanation.
This Danish warning sign is an early planning cue. It appears before the hazard so drivers can adapt speed, following distance, lane position, and observation before the situation becomes demanding. A strong theory explanation connects the sign to a practical response: anticipate the risk, keep control, avoid unnecessary overtaking, and leave extra margin where visibility, grip, crossings, or road width may change. Official catalogue code: A18.
The "Two-way traffic" sign gives advance warning of two-way traffic. It gives drivers time to reduce speed if needed, widen observation, and prepare before reaching the hazard. Catalogue code A18.
Get clear, practical answers to the most common questions about the A18 - Two-way traffic 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 Danish driving theory exam in Denmark.
The A18 sign's primary purpose is to give you advance warning of a section of road where traffic will be travelling in both directions. This allows you to adjust your speed, observation, and positioning before reaching the area, ensuring you are prepared for oncoming vehicles.
You should consider reducing your speed early when the A18 sign appears, especially if it precedes a section where visibility is reduced, road grip is poor, the road width narrows, or vulnerable road users like pedestrians or cyclists are present. This provides a greater safety margin.
A common trap is treating the A18 sign as merely decorative or only reacting when the hazard is directly ahead. Learners might also forget to increase their following distance or fail to anticipate that overtaking might become unsafe due to the upcoming two-way traffic.
No, the A18 sign does not require you to stop or automatically yield. It is a warning sign indicating that traffic will be flowing in both directions. Your obligation to yield or stop depends on other traffic controls like traffic lights, other signs, or priority rules at junctions.
The road layout is key. If the A18 sign is placed before a narrow bridge, a sharp bend with limited visibility, or a section with poor road markings, your need to reduce speed and increase observation is much greater. Always consider the immediate context and any accompanying subpanels or road markings.
A clear reference image of the A18 - Two-way traffic road sign used in Denmark.

The A18 - Two-way traffic road sign may also be known by these alternative names or terms.
The A18 - Two-way traffic road sign is part of the Danish Warning Signs category, which groups together signs with similar rules and functions.
Comparing signs like "Two-way traffic" (A18) with others helps cement your knowledge of Danish traffic rules and road signs, improving sign recognition for your theory test revision. Reviewing similar road signs side-by-side sharpens your ability to distinguish them, crucial for effective traffic sign comparison during your Danish driving licence exam preparation.

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After reviewing the full list of Danish road signs, test your understanding by attempting practice questions focused on sign recognition and meaning. Reinforce your learning and identify areas needing further study to confidently pass your driving theory exam.
View All Danish Road Signs List