I am a Sr. Design Engineer with more than 8 years of experience in Roads . I have been using Civil 3d from last 7 years and my most of the design works are in steep hilly areas like Karakorum Ranges where normal subassemblies and methods are not usually applicable and special design methods , structures and techniques are required so my skills in Civil 3d and subassembly composer improved substantially. Also provision of tunnels, special drains and long bridges some times considered in the design.