Blog Post:
The Department of Highways is making major strides on the 50-kilometre expansion of Highway 37, better known as the Cha-am Bypass, in a move that’s set to transform travel and economic activity between Cha-am, Hua Hin, and Pranburi.

Funded over the 2023–2025 fiscal years, the ฿7 billion project is one of the most significant transport infrastructure upgrades in the region’s history. Once completed, it will enhance road safety, reduce congestion, and strengthen Hua Hin’s position as a top-tier destination for both tourism and real estate.

What’s Being Built?

The upgrade includes:

  • Expansion from 4 to 6 lanes with 3.5-metre-wide lanes in each direction

  • A 10.6-metre central median with concrete barriers

  • 2.5m-wide outer shoulders and 1m-wide inner shoulders

  • 6 grade-separated interchanges

  • 17 U-turn points, including flyovers and under-canal bridges

Key interchanges include:

  • Huai Taphat

  • Silpakorn University

  • Hua Hin District Office

  • Nong Phai

  • Chang Thaeng Krachat

  • Wang Yao near Pranburi

Each section is strategically designed to increase safety and accommodate future traffic growth—projected to reach over 53,000 vehicles per day by 2044, up from 29,000 in 2020.

Real Estate & Local Economy Impact

For homeowners and investors, this project is more than just a road:

  • Improved access to Hua Hin, Black Mountain, and surrounding villages boosts demand for property

  • Reduced travel time from Bangkok and Cha-am will attract weekenders and second-home buyers

  • Easier commuting between tourist hotspots and residential zones strengthens short-term rental and tourism potential

Expect areas near new interchanges and U-turn points to rise in appeal, particularly for:

  • Golf property owners around Springfield and Black Mountain

  • Residential buyers in Hin Lek Fai, Bo Khaem, and Nong Phai

  • Developers seeking new investment opportunities in western Hua Hin and Cha-am’s outskirts

Sustainability & Aesthetics

Aside from efficiency, the Department of Highways has committed to:

  • Landscaping upgrades at key junctions

  • Decorative concrete designs for underpasses and roundabouts

  • Minimizing environmental impact through community-led U-turn planning (e.g., Ban Sam Phan Nam and Ban Khao Sawoei Ratch)

This aligns with Thailand’s 13th National Economic and Social Development Plan (2023–2027), supporting both tourism and agricultural logistics in the region.

When Will It Be Done?

The expansion is well underway, with some junctions already completed and others actively under construction. The full project is expected to be completed by the end of 2026, with benefits felt immediately upon each section’s completion.