Magi Highway commuters, in Central Province, reported that certain sections of the road proved to be impassable during the weekend.
The Kalamona Bridge for one, in the Rigo district, was submerged by flood water.
Commuters had to spend Friday night on the other side of the road until the water ebbed the next day.
Three motor vehicle accidents were reported in that particular section as well though fortunately, no lives were lost.
Rains are expected to continue as the low pressure, sitting over the Coral Sea, is expected to move into far north Queensland on Tuesday morning.
The National Weather Service has reissued heavy rain and flood warning advice from the Port Moresby Warning centre for all regions of the country.
Heavy rain, showers and thunderstorms causing flooding and landslides associated with the monsoon trough will be experienced in some areas of Southern, Momase, Highlands and New Guinea Islands region.
Heavy rains are forecasted to occur and persist over the areas mentioned within the next hours, causing flash flooding and landslides, especially in Western, Gulf, Central, and Milne Bay provinces, including New Ireland, New Britain and Morobe provinces.
Meanwhile, far north Queensland is bracing itself for Tropical Cyclone Trevor, which is predicted to be upgraded to category two tomorrow.
TC Trevor formed this morning as a category one storm off Cape York Peninsula. This is the fifth tropical cyclone to be named in Australian waters this season.
(Crossing the Kalamona Bridge)