A: No. Autodesk offers AutoCAD Mobile and Autodesk Viewer for iOS/Android, but they only open and mark up DWG files. You cannot edit Civil 3D objects (alignments, profiles, pipe networks) on mobile.
Real-time 3D modeling for roads and highways . software portable autocad civil 3d
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If you truly cannot install Civil 3D, these portable tools handle specific civil tasks: software portable autocad civil 3d