The design of Digital Twin is crucial to the Digital Roads project (and to any other projects that aim to leverage DT technologies). The DT platform is essentially a Software as a Service (SaaS). The research objectives for the Digital Twin design encapsulates: • Requirement engineering of the DT platform: eliciting user requirements, system requirements (which include functional and non-functional requirements), data requirements and more. • The design of the Domain Specific Languages (DSLs): based on the requirements, the DSLs capture the concepts (e.g. assets, attributes of assets, relationships among assets) within the DT platform. The DSLs are further broken down into: i) Foundation Data Model (FDM), a general purpose DSL to hold fundamental interoperable information for the DT; ii) Reference Data Library (RDL), an extension of FDM to model the DT for the Roads. The DSLs shall also be able to fuse information from other heterogeneous models (e.g. geometric models, building information models, imageries) for data curation. • The design of the integration cloud: the design primarily focus on how the DT product and DT process models shall be stored so that the CRUD (Create, Read, Update, Delete) operations can be performed efficiently.