The project is the extension of existing Ratchaphruek road with the total length of 15 km to connect the existing highway route no. 345 and no. 346 in north-south direction and a branch to connect Kanchanaphisek road in east-west direction. It consists of 10-lanes at grade road, 10 flyover bridges and 4 interchanges. 

NCE provided the engineering solutions in order to accelerate the construction time and reduce costs. Cast in-situ viaduct box girder bridges were redesigned to precast segmental continuous box girder with external post-tensioning with single or double bored piles.