6.7km tunnel pondered for expressway

Proposal comes with a B36bn price tag

The Expressway Authority of Thailand (Exat) has proposed an underground route to replace a controversial section of the N1 Expressway development following a 17-month initial feasibility study.

Speaking at the second hearing on the project, Exat governor Surachet Laophulsuk said on Monday the agency had considered several aspects, including engineering, investment costs and environmental impact and found the underpass the most feasible.

The 6.7km underpass, which will be the country’s first expressway tunnel, will run along Ngarmwongwan Road via Phongphet Intersection, Bang Khen Intersection, and Kaset Intersection…