What should you do?
Slow down and prepare to stop; treat each carriageway as a separate road, checking right for the near side and left for the far side before crossing or joining.
How to recognise it
Yellow diamond with two parallel black horizontal bars (the dual carriageway) and a short stem from below that stops at them.
Common confusion
Compare with the crossroads with dual carriageway sign, where the stem passes through both bars because your road continues across.
Explanation written by the My Driving Test editorial team using the Department of Transport Traffic Signs Manual conventions and the RSA Rules of the Road.
