4 Engineering Assessment 4.1 Introduction 4.2 Design Standards 4.3 Departures from Standard 4.4 Topography and Land Use 4.5 Roads Infrastructure - Ground Conditions, Geology and Geomorphology 4.6 Main Crossing Geotechnical Summary 4.7 Drainage, Hydrology and Hydrogeology 4.8 Land Based Structures 4.9 Fencing and Environmental Barriers 4.10 Traffic Signs and Lighting 4.11 Road Restraint Systems 4.12 Public Utilities 4.13 Design Development 4.14 Proposed Construction Sequence References