Road Rules and Right-of-Way
Right-of-way rules exist to make behaviour predictable. In PNG, traffic keeps to the left, which shapes every junction rule.
Junctions and intersections
At a give-way or unmarked intersection, give way to traffic already on the through road and to any vehicle approaching from your right. At a roundabout, traffic already circulating has priority; you give way to the right as you enter and signal left to leave. At a stop sign you must come to a complete halt, then proceed only when clear - a rolling stop is a fail.
Turning and overtaking
When turning left, keep close to the left kerb and give way to pedestrians crossing. When turning right, you cross oncoming traffic, so yield to vehicles coming towards you. Overtake on the right by default, only where the line markings allow, only when you can see far enough ahead, and never at a crossing, on a blind crest or curve, or where a solid line forbids it.
Following and speed
Keep a safe following distance - the two-second rule in good conditions, more when wet or loaded. Speed limits are maximums for ideal conditions, not targets; you must slow for rain, gravel, darkness or pedestrians.
Trap to watch: questions often place a give-way situation on an unmarked junction and expect "give way to the right". Another common trap is a right-turning vehicle versus oncoming traffic - the turning vehicle yields.
Rule of thumb: at any unclear junction, the vehicle approaching from your right goes first; if in doubt, yield.