CH. Karnchang Public Company Limited has signed as the Contractor in the Contract for maintenance and improvement of the structures and system works of the Si Rat Expressway, the Si Rat - Outer Ring Road Expressway and the
Udon Ratthaya Expressway with Bangkok Expressway and Metro Public Company Limited as the Employer per the details of works as follows: Execution Date is July 12, 2022. Estimated Contract Value is THB 1,078,094,260 (excluding value added tax). Operation Periods is Approximately 17 months.