Pattaya has implemented a major infrastructure upgrade — the Pattaya Klang Underpass. Opened in 2017, it has significantly improved traffic flow in the city center. Below — the latest updates and its role in Pattaya’s transport system in 2025.
What It Is and Why It Matters
The Pattaya Klang Underpass includes:
- Total length: 1.9 km (with ramps);
- Underground section: 420 meters;
- Lanes: 4 underground (2 in each direction) and 6 surface lanes.
At the time, it was Thailand’s longest road tunnel. Designed with dolphin-themed panels, light boxes and acoustic walls — reflecting Pattaya’s coastal identity.
How It Works and Its Benefits
The tunnel has:
- Reduced traffic jams in central Pattaya;
- Improved pedestrian and vehicle safety;
- Made traffic flow more predictable, especially near Bali Hai Pier and central business zones.
Current Status (February 2025)
The underpass is fully operational and handles tens of thousands of vehicles daily. In January 2025, it was officially included in the Pattaya Marathon route — a sign of its integration into city life.
Additional Infrastructure Projects
A parallel drainage tunnel (2 meters in diameter) is under construction to prevent seasonal floods and improve water management in the area.
Conclusion
The Pattaya Klang Underpass is a major step in Pattaya’s infrastructure modernization. It eases traffic pressure, improves safety and supports large-scale city events. With ongoing upgrades like flood control, the tunnel continues to enhance Pattaya’s urban mobility and resilience in 2025.
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