CH. Karnchang Public Company Ltd.
ITALIAN-THAI Development Public Company Ltd.
Department of Highways
Department of Rural Roads
Bangkok Expressway Public Company Ltd.
Electricity Generating Authority of Thailand (EGAT)
Department of Groundwater Resources
Airport of Thailand (AOT)
Royal Irrigation Department
Bangkok Metropolitan Administration
Metropolitan Waterworks Authority (Thailand)
Expressway Authority of Thailand
Department of Public Works and Town & Country Planning
State Railway of Thailand
Office of Transport and Traffic Policy and Planning (OTP)