Double curveWallonia
261. Double curve
A double curve is a road section containing two successive curves in opposite directions. The first curve may turn left and then right, or right and then left.
The same warning sign may also indicate a longer succession of curves. Drivers should reduce speed before the first curve, remain within their lane and be prepared for the following curves to differ in direction, sharpness and length.
Wikimedia.org • Jean Housen • CC BY-SA
Which Belgian signs warn of a double curve?
Traffic signs A1c and A1d warn of a double curve or a succession of more than two curves.
Can a panel indicate the distance to the first curve?
Yes. A supplementary distance panel may indicate approximately how far ahead the dangerous section begins.
Does a Belgian double-curve warning sign impose a speed limit?
No. The applicable regional, zonal, posted and vehicle-specific speed limits remain in force.
Must you sometimes drive below the permitted speed?
Yes. Drivers must adapt their speed to the curves, visibility, weather, traffic, road surface and condition and load of the vehicle.
Must you be able to stop within the visible distance?
Yes. Drivers must remain able to stop before a foreseeable obstruction, including one hidden beyond either curve.

Traffic rules
Wallonia