The typical cross section of expressway drawing DWG file includes component of clay, sandy clay with grits, clayey sand (sc), silty sand (sm), yellowish grey, somewhere is clayey gravel (gc) ash grey, medium denese. all detailed structures refer to other drawings, available sight distance for drain shall be applied where the groundwater table is observed and/or as decided by the engineer. download free expressway CAD drawing DWG file.