The M3d 'On the Indicated Lane' direction plate is a crucial supplementary sign in France, working with main traffic signs to clarify their application. It precisely indicates to which side, lane, or direction a primary rule or warning applies, preventing confusion and ensuring drivers react correctly. Always check this plate in conjunction with the main sign and road markings before making decisions about stopping, turning, or changing lanes, as it dictates the specific area controlled.
This 'On the Indicated Lane' sign (M3d) clarifies which specific lane or direction a primary road sign's instruction applies to, crucial for accurate decision-making during your theory test revision. Mastering its interpretation ensures you correctly follow traffic rules and avoid misinterpreting restrictions in French driving theory.
Direction plates are used when a sign affects only one direction, one side of the road, one lane, or a particular movement. They must be read with the main sign and road markings before stopping, turning, changing lane, or deciding whether a restriction applies. A safe response is to confirm both the sign and the part of the road it controls. Official French sign code: M3d.
"On the indicated lane" shows the side, lane, or direction to which the main sign applies. It prevents the rule or warning being applied to the wrong part of the road.
Get clear, practical answers to the most common questions about the M3d - On the indicated lane 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 French driving theory exam in France.
The M3d sign's main purpose is to show the specific lane, side, or direction to which another main traffic sign applies. It ensures that you don't misinterpret a sign's instructions, like a speed limit or prohibition, as applying to the entire road when it only affects a particular part.
When you see the M3d sign, you must read it together with the main sign it accompanies and observe the relevant road markings. Pay close attention to the direction indicated by the arrows on the M3d plate to understand exactly which part of the road or which movement the main sign's rule governs. Adjust your driving position and intended actions accordingly, if your lane or direction is affected.
A common mistake is not looking at the M3d sign at all, or only seeing the main sign and assuming its rule applies to all lanes. Another error is reacting too late, perhaps making a sudden lane change after passing the sign, rather than anticipating the direction indicated. Always confirm the sign's scope before acting.
Yes, the effect of a main sign can change significantly when paired with an M3d direction plate. For example, a 'no stopping' sign might only apply to the left lane when the M3d plate indicates that direction, while other lanes might remain unaffected. It's essential to understand precisely what the direction plate is controlling.
If you find the M3d direction plate and the road markings confusing or unclear, always err on the side of caution. Choose the safest and most legally compliant option, which usually means proceeding slowly and being prepared to follow any potential restriction or warning indicated by the main sign until you can clarify the situation.
A clear reference image of the M3d - On the indicated lane road sign used in France.

The M3d - On the indicated lane road sign may also be known by these alternative names or terms.
The M3d - On the indicated lane road sign is part of the France Direction Plates category, which groups together signs with similar rules and functions.
Master French road signs by comparing this 'On the indicated lane' direction plate with similar traffic signs. Focused study of related signs sharpens your recognition and reduces errors, crucial for passing your theory test revision.

M3a 'On the Right Lane' Direction Plate: Follow the Main Sign Correctly

The M3a sign indicates the left lane is controlled by another sign or restriction.

Master the M8e 'Left' Direction Plate: Know Exactly Where the Main Sign Applies

Warning: Children Crossing Ahead – Prepare to slow down and be vigilant!

Prepare for Pedestrians: The A13b 'Pedestrian Crossing Ahead' Warning Sign

Prepare for cattle on the road with the French A15a warning sign.
Now that you've reviewed the full list of French road signs, enhance your understanding. Explore signs grouped by specific categories for deeper insights, test your recognition with practice questions, and solidify your knowledge for the Code de la route exam.
Browse All French Road Signs