The Expressway Authority of Thailand (Exat) has proposed a tunnel to replace a controversial section of the N1 Expressway development.
Exat governor Surachet Laophulsuk said on Monday the agency had considered several aspects and found the underpass the best idea.
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 to Prasertmanukit Road before connecting with the N2 Expressway.
Mr Surachet said the environmental impact assessment will end in May next year for submission to the cabinet for approval.
