This B3a prohibitory traffic sign in France clearly indicates that lorries are forbidden from overtaking other vehicles. As a prohibitory sign, it enforces a specific traffic rule to enhance safety or manage traffic flow, particularly on roads where overtaking by larger vehicles could be hazardous. Drivers of lorries must adhere strictly to this restriction and must not overtake unless a specific exemption is indicated by a supplementary plate or subsequent signage.
This sign explicitly prohibits lorries from overtaking, a crucial rule for managing traffic flow and safety on French roads. Mastering such prohibitory signs is vital for your driving theory revision and passing the exam.
Prohibitory signs are legally binding signs that prevent unsafe or unsuitable traffic movements. This sign may restrict entry, overtaking, turning, parking, stopping, horns, vehicle type, vehicle size, weight, or dangerous goods. Drivers should identify whether the restriction applies to them before entering the controlled area and should choose another lawful route if necessary. Official French sign code: B3a.
"No overtaking by lorries" tells drivers that a movement, access, vehicle category, stopping action, dimension, weight, or behaviour is prohibited. The restriction applies from the sign unless a plate or road layout states otherwise.
Get clear, practical answers to the most common questions about the B3a - No overtaking by lorries 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 B3a sign means that vehicles classified as lorries (or heavy goods vehicles) are prohibited from overtaking any other vehicle. This is a mandatory instruction that applies from the point of the sign onwards, unless a supplementary plate indicates otherwise or an end-of-restriction sign is encountered.
This sign specifically targets lorries. Drivers of cars or motorcycles not classified as lorries are generally permitted to overtake, provided it is safe and otherwise lawful. However, always check for any supplementary plates that might extend or modify the restriction.
A common trap is assuming the restriction doesn't apply if you see other lorries overtaking; the sign's instruction remains valid regardless of other drivers' behaviour. Another mistake is not checking supplementary plates, which could specify times, distances, or types of lorries affected, or even exceptions. Failing to plan an alternative route if your intended route is blocked by this prohibition is also an exam pitfall.
The prohibition remains in effect until you encounter an 'End of Prohibition' sign (often a circular sign with a black bar across it), or until the road layout or a new sign explicitly cancels the restriction. Do not assume the rule ends automatically when the road conditions change.
Generally, no. However, supplementary plates below the B3a sign can specify exemptions. For example, a plate might state the restriction applies only to lorries over a certain weight or during specific hours. Always read any accompanying plates carefully to understand the exact conditions of the restriction.
A clear reference image of the B3a - No overtaking by lorries road sign used in France.

The B3a - No overtaking by lorries road sign may also be known by these alternative names or terms.
The B3a - No overtaking by lorries road sign is part of the France Prohibitory Signs category, which groups together signs with similar rules and functions.
Understanding distinctions between similar road signs is key for accurate theory test revision. Comparing this 'No Overtaking by Lorries' sign with others aids sign recognition and prevents confusion during your French driving licence exam preparation.

B0 'No Vehicles' Sign: Understanding This Important Prohibition

What does the B1 'No Entry' prohibitory sign mean for French drivers?

France's B10a 'Length Limit' Sign Prohibits Certain Vehicle Movements

Observe the B11 Width Limit sign to avoid restricted zones.

B12 Height Limit: Know Your Vehicle's Clearance and Avoid Restrictions

The B13 Weight Limit sign restricts vehicles exceeding a specified weight.

B13a: Understand the Axle Weight Limit Prohibitory Sign

The B14 'Speed Limit' Sign: Understanding and Obeying Prohibitory Restrictions
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