Highway Design Manual for Landscape Architects

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Highway Design Manual for Landscape Architects
Highway Design Manual (HDM) for Landscape Architects

A highlight of topics related to Landscape Architecture.

The Highway Design Manual (HDM) establishes uniform design standards to accomplish Caltrans’ highway design function.  It is Caltrans’ main source of guidance on highway design.

The most relevant chapter to the landscape architect is Chapter 900 (PDF)  “Landscape Architecture”, but there are several additional chapters that provide relevant information.  Below are HDM Chapters, Topics and Indexes in which Landscape Architects are typically involved:

Chapter 10          Division of Design
Chapter 20          Designation of Highway Routes
Chapter 40          Federal-Aid
Chapter 60          Nomenclature                                                         12-30-15
Topic 62 – Definitions
                62.5        Landscape Architecture
Chapter 80          Application of Design Standards
Chapter 100        Basic Design Policies                                           12-30-15
        Topic 109 – Scenic Values in Planning and Design
Topic 110 – Special Considerations
                110.2     Control of Water Pollution
                110.4     Wetlands Protection
                110.5     Control of Noxious Weeds – Exotic and Invasive Species
                110.10   Proprietary Items
Chapter 200        Geometric Design and Structure Standards    12-30-15
Topic 201 – Sight Distance
                201.6     Stopping Sight Distance on Horizontal Curves
Topic 210 – Reinforced Earth Slopes and Earth Retaining Systems
                210.5     Aesthetic Considerations
Chapter 300        Geometric Cross Section                                   12-30-15
Topic 304 – Side Slopes
                304.1     Side Slope Standards
                304.4     Contour Grading and Slope Rounding
                304.5     Stepped Slopes
Chapter 400      Intersections at Grade                                        12-30-15
Topic 405 – Intersection Design Standards
                405.10   Roundabouts
Chapter 500      Traffic Interchanges                                           12-30-15
Topic 504 – Interchange Design Standards
                504.2   Freeway Entrances and Exits
Chapter 600      Pavement Engineering
Chapter 610      Pavement Engineering Considerations
Chapter 620      Rigid Pavement
Chapter 630      Flexible Pavement
Chapter 640      Composite Pavements
Chapter 650      Pavement Drainage
Chapter 660      Base and Subbase
Chapter 670      Tapers and Shoulder Backing                        12-30-15
Topic 671 – Pavement Tapers
                Figures 671.3B Longitudinal Tapers at Shoulders, Curbs,
Dikes, Inlets, and Metal Beam Guard Railing

Chapter 700      Miscellaneous Standards                               12-30-15
Topic 705 – Materials and Color Selection
                705.2   Colors for Steel Structures
Topic 706 - Roadside Treatment
                706.1   Roadside Management
                706.2   Vegetation Control
                706.3   Topsoil
                706.4   Irrigation Crossovers for Highway Construction Projects
                706.5   Water Supply Line (Bridge) and Sprinkler Control Conduit for Bridge
Topic 707 – Slope Treatment under Structures
                707.1   Policy
                707.2   Guidelines for Slope Treatment
                707.3   Procedure
Chapter 800      General Aspects                                                 12-30-15
Topic 806 – Definition of Drainage Terms
                806.2   Drainage Terms Vernal Pools
Chapter 810      Hydrology
Chapter 820      Cross Drainage
Chapter 830      Transportation Facility Drainage
Chapter 840      Subsurface Drainage
Chapter 850      Physical Standards
Chapter 860      Roadside Channels                                           03-07-14
Topic 861 - General
                861.3   Damaged Channel
Topic 864 – Channel Stability Design Concepts
                864.2   Stable Channel Design Procedure
Topic 865 – Channel Linings
                865.1   Flexible Verses Rigid
                865.3   Long-Term Flexible Lining
                865.5   Bare Soil Design and Grass Lining
                865.6   Rolled Erosion Control Products
Chapter 870      Channel and Shore Protection 03-07-14
Topic 871 – General
                871.2   Design Philosophy
Topic 873 – Design Concepts
                873.1   Introduction
                873.3   Armor Protector
Chapter 880      Underground Disposal
Chapter 890      Storm Water Management                           09-01-06
Topic 892 – Storm Water Management Strategies
                892.3   Design Considerations
Chapter 900      Landscape Architecture                              12-30-15
Chapter 1000   Bicycle Transportation Design
Chapter 1100 Highway Traffic Noise Abatement                 12-30-15
Topic 1102 – Design Criteria
                1102.6   Noise Barrier Aesthetics