Under the Congolese Highway Code (Loi n° 78/022 portant Nouveau Code de la Route), on which side of the public carriageway must vehicles normally circulate in DR Congo?

1. On the right-hand side of the carriageway, as close as safely practicable to the right edge or curb
2. On the left-hand side of the carriageway, in accordance with Southern African SADC conventions
3. In the exact middle of the roadway unless another vehicle is approaching from the opposite direction
4. On whichever lane has the smoothest surface, regardless of the direction of oncoming traffic