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Belgian traffic signs A1a, A1b, A1c and A1d warn of dangerous curves.

Traffic sign A1a warns of a dangerous curve to the left.

Traffic sign A1b warns of a dangerous curve to the right.

Traffic sign A1c warns of a double curve or a succession of more than two curves, with the first curve turning left.

Traffic sign A1d warns of a double curve or a succession of more than two curves, with the first curve turning right.

No. A1c and A1d primarily indicate the direction of the first curve. The following curves may differ in shape, length and sharpness.

Belgian placement rules reserve them for curves that appear unexpectedly or must be negotiated with a significant reduction in speed.

For successive curves, the warning sign is normally placed before the first curve. A supplementary panel may indicate the length of the winding road section.

Yes. A supplementary distance panel may indicate approximately how far ahead the dangerous curve begins.

No. The applicable regional, zonal, posted and vehicle-specific speed limits remain in force.

Yes. Belgian drivers must adapt their speed to the road layout, visibility, weather, traffic and vehicle condition and remain able to stop before a foreseeable obstruction.

Reduce speed before entering the curve. Use smooth steering and avoid harsh braking or acceleration while the vehicle is cornering.

Yes. Drivers must normally remain as close as possible to the right-hand side and may not cut across the part intended for oncoming traffic.

No. Drivers may not cross a continuous white line or drive to its left when it separates opposing directions of traffic.

The specified left-side overtaking is prohibited in a curve when visibility is insufficient. An exception applies when the manoeuvre can be completed without crossing the continuous white line separating opposing traffic.

No. The prohibition depends on insufficient visibility and the applicable overtaking and road-marking rules, not solely on the presence of the warning sign.

Stopping and parking on the carriageway are prohibited in a curve when visibility is insufficient.

The curve-specific prohibition applies where visibility is insufficient. All other stopping and parking rules, signs and safety requirements must still be respected.

No. Drivers must continue to follow traffic lights, priority signs and the ordinary priority rules.

Reduce speed and observe the priority signs carefully. The bend may hide crossing traffic, cyclists or pedestrians until the driver is close to the intersection.

Wait until there is sufficient visibility and room to leave at least one metre inside a built-up area or 1.5 metres outside a built-up area. Do not cross a continuous line or enter the path of approaching traffic.

Motorcyclists must remain within their part of the carriageway and ensure that neither they nor their motorcycle enters the section intended for oncoming traffic while leaning through the curve.

Reduce speed before the curve, increase following distance and use the steering, brakes and accelerator smoothly. Painted markings and metal surfaces may be especially slippery.

Yes. From 1 June 2027, A1a and A1b continue to indicate dangerous left and right curves, while A1c and A1d continue to indicate double or successive curves according to the direction of the first curve.