At an intersection with no traffic lights, police officer, or priority signs, which rule governs the right of way under Congolese traffic law?

1. Priority to the right (priorité à droite), requiring drivers to yield to vehicles approaching from their right
2. Priority to the left (priorité à gauche), requiring drivers to yield to vehicles approaching from their left
3. Priority to the largest vehicle, granting heavy trucks right of way over light passenger cars
4. Priority to whichever vehicle reaches the intersection first at the highest speed