Applicable throughout Papua New Guinea, a speed-limit of 60kmh (37 mph) applies in town areas (built-up areas), unless otherwise indicated by speed control signage applicable to a specific road.
Outside built-up areas, a 75kmh speed-limit (47 mph) applies to highways, unless otherwise indicated.
Papua New Guinea does not use 'end speed-limit' signage (used globally to fall to a regulated rural default speed limit), or 'speed derestriction' signs (to cease all speed restrictions). Any signposted limit outside the two speed-limits listed above, apply only to the specific length of road which it is signposted, its stated speed restriction ending at - the end of the particular road itself (T-intersection or dead-end, the end of the road), or at another speed restriction sign.
It should be noted that Papua New Guinea is a contracting party to 'The UN Convention on Road Traffic' (1949), as at 12 February 1981.
Speed restriction signage used in PNG is to the international system in design.