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This study proposes a 3D intelligent object model in highway construction to electronically represent a large amount of information in highway projects based on the international standard ISO 10303. Also known as STEP (Standard for the Exchange of Product), ISO 10303 is an open standard, and has been used for data exchange in building projects of the AEC industries. Motivated by the success from the building industry, this research attempts to apply an object based intelligent model in 3D highway modeling. In order to test the feasibility of the proposed approach, a prototype was developed and tested on a highway project in Seoul, Korea with a team led by Korean Institute of Construction Technology (KICT). The proposed 3D intelligent model was applied to build a 3D model and automatically derive cost/schedule estimates from the 3D object model. To develop a 3D object model in highway road construction, this paper explores different options such as Industry Foundation Classes (IFCs) and LandXML and establish a comprehensive object model for highway structures with different components such as roads, a bridge, and a tunnel as well as topographical representations that could be used for cost/schedule estimation.

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This study proposes a 3D visualization model in highway design/construction that electronically represents information of highway projects. The 3D model will be based on the STEP (Standard for the Exchange of Product model data), which is an open standard, so it can be used as data structures. Since the design model includes integrated resources to represent 3D geometric shape and project management information of the infrastructure, the built visualization model will allow end-users to extract the necessary data from the object based 3D intelligent model. This integrated data model is expected to provide practical engineering information to improve the design/construction process. This study presents the framework for the integration of application programs such as existing 3D/CAD programs used in practice by applying the STEP-based information model and information technologies. With the system integration framework composed of the information model, data repository, application program, and application programming interface, this research proposes establishing a prototype system according to the system integration framework so that end-users can manage information of an infrastructure in an integrated computing environment. The final output of this research is to present a methodology to automatically generate a construction schedule from infrastructure facility design information. This method is performed by the full connection between construction quantity takeoff analysis and design information by using the information model.

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