Applicable throughout Papua New Guinea, a speed-limit of 60 km/h (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 75 km/h 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.

Papua New Guinea is a contracting party to "The UN Convention on Road Traffic" (1949), as of 12 February 1981.

Speed restriction signage used in PNG is to the international system in design.