The bidding process is expected to take place this year, after which construction of the entire route will take four years.
The SRT has divided the project into three construction contracts: the Den Chai-Ngao section, worth Bt26.704 billion; the Ngao-Chiang Rai section, worth Bt28.735 billion; and the Chiang Rai-Chiang Khong section, worth Bt17.482 billion.
Land expropriation will cost Bt10.66 billion, and the cost of hiring a project consultant is Bt1.764 billion.