Integrated Tidal Flood Control Toll Road in Central Java Nears Completion
PT Wijaya Karya (Persero) Tbk (WIKA) continues to demonstrate its commitment to supporting national strategic infrastructure development through the Semarang-Demak Toll Road project. The project is part of the Trans-Java Toll Network, playing a crucial role in enhancing connectivity across Central Java’s northern coastal region and facilitating the movement of goods and people along the Pantura corridor.
Unlike typical toll road projects, the Semarang-Demak Toll Road is designed as a multifunctional infrastructure that not only supports transport connectivity but also integrates as a sea dike. The project is expected to help address tidal flooding issues in Semarang and surrounding coastal areas, providing dual benefits as both a transport infrastructure and a long-term flood control solution.
As of May 2026, WIKA’s progress on the Semarang-Demak Toll Road Section 1B has reached 83.39%. This includes key works such as main road construction, on and off ramps, elevated bridges, combi walls, and sand embankments over bamboo mats.
In execution, WIKA has implemented specialised construction methods due to the project’s coastal location with soft soil characteristics posing significant technical challenges. A key element is the use of combi walls, which form part of the sea dike structure and support the toll road’s embankment.
The combi wall structure is designed to withstand combined soil and seawater pressure, including hydrostatic forces and potential ground settlement. Thus, it plays a critical role in maintaining long-term structural stability in coastal areas prone to tidal flooding.
Additionally, the project employs sand embankments over bamboo mats as a ground reinforcement solution. This method ensures even load distribution, enhances initial construction stability, and reduces the risk of differential settlement in soft soil.
WIKA Corporate Secretary Ngatemin stated that WIKA’s involvement in the Semarang-Demak Toll Road project reflects the company’s role in delivering infrastructure that addresses both mobility needs and environmental challenges in coastal areas.
“The Semarang-Demak Toll Road is a strategic project with significant functions, not only as a new connectivity route in the Pantura corridor but also as a tidal flood control infrastructure for coastal communities. Through this project, WIKA is committed to ensuring construction quality, workplace safety, and the application of methods suited to the coastal region’s characteristics. We hope the project will deliver long-term benefits for the community, strengthen regional connectivity, and drive economic growth in Central Java,” Ngatemin said.
Through the Semarang-Demak Toll Road project, WIKA reaffirms its role as a strategic government partner in delivering infrastructure that enhances connectivity while providing sustainable solutions to environmental challenges and community needs.