Expressway Authority of Thailand planned to develop Roi Et No.23 National Highway Project, in Unkown, Roi Et, Thailand. China Railway 20 Bureau Group Corporation was the construction contractor. The project covered the construction of a 25.9 km highway. Located at Northeast Thailand's Roi Et, the highway was to be renovated into a four-lane road. The construction period was 870 days. The project was Thailand’s first China-participated national highway and traffic pressure in northeastern Thailand would be greatly relieved and livelihoods in affected areas were expected to be improved.