Sign J1: Warning for an uneven or poor road surface
Legal meaning
Poor road surface.
Shape and colour
Triangle with a red rim and a black bumpy surface: warning of a bad road surface.
Where the sign stands
Outside the built-up area 100–150 m before the bad stretch, inside it shorter, on the right; a plate may give the length.
What the exam asks about this sign
The exam asks what to do at a bad road surface: reduce speed, increase distance and avoid abrupt steering; the sign imposes no speed. Trap: candidates pick a fixed speed or an obligation to stop, but J signs only warn; you decide the safe speed yourself.
Often confused with
- Warning for a road bump (speed hump)
J38— Speed hump: a single obstacle instead of a bad surface. - Warning for a slippery road
J20— Slippery road: slick instead of bumpy. - Warning for road works ahead
J16— Roadworks: often the cause of a bad surface.
Signs in the same series
- Warning for a bend to the right
J2 - Warning for a bend to the left
J3 - Warning: double bend, first one to the right.
J4 - Warning: double bend, first one to the left.
J5 - Warning: steep hill UPWARDS (climb).
J6 - Warning: steep hill DOWNWARDS (descent).
J7 - Warning for a dangerous crossroads
J8 - Warning for a roundabout ahead
J9