The document provides instructions to tenderers for the design and construction of an elevated viaduct from CH:15738 m to 20900 m on Corridor-2 of the Chennai Metro Rail Project, Phase I. Key details include the contract number, tender validity period of 120 days, time for completion of 730 days from commencement, and eligibility requirements for tenderers. The instructions cover preparation of tenders, technical and financial package requirements, clarifications, amendments, submission process, opening and evaluation. Tenderers are advised to carefully examine all documents and seek any clarifications needed on the project.