The 'Turn Right Only' sign (402.4) is a mandatory traffic sign that dictates a specific direction of travel. When you see this sign, you must turn right and cannot proceed in any other direction from that lane or path. This sign is crucial for maintaining order and safety, especially at junctions, islands, or where traffic streams need to be separated, ensuring you follow the intended and safest route.
This mandatory direction sign clarifies that a right turn is the only permissible manoeuvre, crucial for maintaining orderly traffic flow and preventing conflicts in complex intersections. Mastering its specific meaning is vital for your Icelandic driving theory test revision and understanding road sign explanations.
Turn Right Only is a mandatory sign used where traffic has to move in a particular way to stay safe and orderly. It often appears at islands, central refuges, one-way arrangements, path networks, and places where separating traffic streams matters more than driver preference. The sign should be read together with arrows, lane markings, kerbs, and the physical road layout because those details show exactly how the instruction is applied on site. Ignoring a mandatory sign can place you into direct conflict with opposing traffic, pedestrians, cyclists, or a protected part of the road space.
This sign makes turn right only compulsory for the road user or lane concerned. You must follow the direction, side, or path shown instead of choosing your own line through the location.
Get clear, practical answers to the most common questions about the 402.4 - Turn Right Only 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 Icelandic driving theory exam in Iceland.
The 'Turn Right Only' sign (402.4) is a mandatory direction sign. Its main purpose is to compel road users or those in a specific lane to turn right, ensuring traffic flows in a pre-determined, safe, and orderly manner. It overrides any driver's preference to choose a different path.
When you see the 'Turn Right Only' sign (402.4), you are prohibited from choosing any direction other than right. This includes driving straight on, turning left, or improvising by swerving across lanes late to correct a missed turn. You must also avoid driving on the wrong side of any central island or refuge indicated by the sign.
You must position your vehicle early to ensure you can safely make the compulsory right turn. Pay close attention to lane markings, road layout, and any accompanying arrows. Use your mirrors and signals as needed, and adjust your speed to complete the manoeuvre smoothly and safely, following the direction indicated by the sign and the road.
No, 'Turn Right Only' signs are mandatory and do not have exceptions for driver preference. They are placed where following the designated direction is critical for safety and traffic management. Always interpret them as a strict instruction to turn right from the specified lane or path.
A common exam trap is assuming you can still proceed straight if the road seems wide or if you miss the turn. Another mistake is not understanding that this sign dictates the movement for that specific lane or position, not just general area advice. Learners might also incorrectly believe they can correct their path later if they fail to position correctly.
A clear reference image of the 402.4 - Turn Right Only road sign used in Iceland.

The 402.4 - Turn Right Only road sign may also be known by these alternative names or terms.
The 402.4 - Turn Right Only road sign is part of the Mandatory Direction Signs category, which groups together signs with similar rules and functions.
Mastering Icelandic road signs means understanding subtle differences. Comparing signs like 'Turn Right Only' with others in the same category helps solidify your memory and reduce errors during your theory test revision. Explore similar road signs and traffic sign comparison to boost your sign recognition for the exam.

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After reviewing the full list of Icelandic road signs, reinforce your learning with targeted practice. Explore our sign group categories or take a specific quiz to test your recognition and recall. Ensure you're fully prepared to identify and interpret all traffic signs for your upcoming driving theory exam.
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