Highway Intersection Cad System

The design of intersection is an important part of highway design. On the basis of analyzing and summarizing intersection's character, the author has studied the horizontal design method and the new vertical design method based on Coons surface model. Further more, combining the design custom of intersection, the author has developed "Highway Intersection CAD System" based on Windows Operating System. By using Visual Basic 5.0 language, ActiveX Automation Interface, the OOP technology and developing AutoCAD 2000, the system not only can achieve the horizontal design and the vertical design of three-legs and four-legs intersection at the tangent section and the curved section, but also can calculate earthwork based on Digital Terrain Model. The system manages the engineering data by using the engineering database, which have the fundamental functions of real-time storage, real-time query, realtime modification.