THE construction of retainer walls along coastal roads of the Dreketi-Nabouwalu highway will cost $3million.
China Railway First Group Fiji Limited project engineer Jeff Peng said the company was working to construct 7000 cubic metres of the walls.
Mr Peng said the retainer walls served to protect embankments and prevent soil from eroding into the sea.
"We will also build retainer walls for river banks and streams that run along the project site to ensure that roads are protected," he said.
"Meanwhile, we are also working on addressing waterlogged areas along the highway, which has become a major problem for vehicle operators in the past.
"The approach involves the usage of geo-textile materials to cover these wet surfaces and then filling them up with rocks to ensure a stable foundation for the roads."