EXA Studies N1 Expressway Design with Brown Line Monorail

MGR Online•Economy•1d ago

Reader Briefing

The Expressway Authority of Thailand is redesigning the N1 Expressway to integrate with the Brown Line Monorail and resolve traffic issues near Kasetsart University.

•EXA is preparing to hire a consultant for 30 million baht to study the N1 Expressway design starting October 2026.
•The N1 project will be an elevated route integrated with the Mass Rapid Transit Authority of Thailand's Brown Line (Khae Rai-Lam Sali).
•EXA is managing multiple urgent projects, including the Double Deck Expressway and Phuket expressways.
•The Rama 3-Dao Khanong-Outer Ring Road West project is 95.98% complete as of August 2026.

Overview

•EXA is preparing to hire a consultant with a 30 million baht budget to study the suitability, review the route, and redesign the N1 Expressway.
•The N1 Expressway study is expected to begin in October 2026, taking 17 months, with a proposal to the Cabinet in 2029.
•EXA previously considered a tunnel under the Kasetsart intersection, but the construction cost exceeded 50 billion baht, making it not worth the investment.
•The Land Traffic Arrangement Committee (KJR) resolved in December 2025 that the N1 Expressway is necessary and instructed EXA to review the study and discuss the route with Kasetsart University.
•The Double Deck Expressway (Ngam Wong Wan-Rama 9) is currently awaiting approval from the PPP Committee to amend the contract under the Public-Private Partnership Act 2019.
•The Rama 3-Dao Khanong-Outer Ring Road West project reached 95.98% construction progress as of August 2026.
•The Chalong Rat extension (Chatuchot-Lam Luk Ka Road) is under construction and expected to open in 2028.

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Key Entities

Organization

Expressway Authority of Thailand(การทางพิเศษแห่งประเทศไทย)ℹ️

The agency responsible for studying and constructing the N1, N2, and other expressway projects.

EXA(กทพ.)ℹ️

Abbreviation for the Expressway Authority of Thailand.

Kasetsart University(ม.เกษตร)ℹ️

The educational institution whose front area is the focus of the N1 Expressway route discussions.

Land Traffic Arrangement Committee(คณะกรรมการจัดระบบการจราจรทางบก)

The body that resolved in December 2025 that the N1 Expressway is necessary.

KJR(คจร.)

Abbreviation for the Land Traffic Arrangement Committee.

Mass Rapid Transit Authority of Thailand(การรถไฟฟ้าขนส่งมวลชนแห่งประเทศไทย)ℹ️

The agency responsible for the Brown Line Monorail (Khae Rai-Lam Sali).

MRTA(รฟม.)

Abbreviation for the Mass Rapid Transit Authority of Thailand.

Cabinet(ครม.)

The government body responsible for approving the expressway projects.

Person

Surachet Laophulsuk(สุรเชษฐ์ เหล่าพูลสุข)

The Governor of the Expressway Authority of Thailand.

Law

Public-Private Partnership Act 2019(พ.ร.บ. การร่วมลงทุนระหว่างรัฐและเอกชน พ.ศ. 2562)

The law governing the contract amendment process for the Double Deck Expressway project.

Place

Phuket(ภูเก็ต)ℹ️

The province where two phases of a new expressway project are planned.

Surat Thani(สุราษฎร์ธานี)ℹ️

The province where the Samui island connection expressway is being studied.

Trat(ตราด)ℹ️

The province where the Chang island connection expressway is being studied.