At an intersection one should go to the left or right.
There is reversible traffic on the road to be crossed.✓Bonne réponse
One-way traffic is organized on the crossed road.
Explication
The blue sign with a horizontal double-headed arrow announces reversible traffic on the road being crossed. It does not prescribe a turn toward either side, and a one-way road would be shown with a single direction rather than opposing horizontal arrows.
