• ♦Manual Notice 2006-2
• ►Preface
• ►1. Design General
  • ►1. Overview
    • ♦Application of Design Guidelines
    • ♦Roadway Design Manual Format
    • ♦External Reference Documents
  • ►2. Design Exceptions, Design Waivers and Design Variances
    • ♦Overview
    • ♦Design Exceptions
    • ♦Design Waivers
    • ♦Design Variances
  • ►3. Schematic Layouts
    • ♦Overview
  • ►4. Additional Access to the Interstate System
    • ♦Requirements
  • ►5. Preliminary Design Submissions
    • ♦Submissions
  • ►6. Maintenance Considerations in Design
    • ♦Maintenance
• ►2. Basic Design Criteria
  • ►1. Functional Classifications
    • ♦Overview
  • ►2. Traffic Characteristics
    • ♦Overview
    • ♦Traffic Volume
    • ♦Traffic Speed
    • ♦Turning Roadways and Intersection Corner Radii
  • ►3. Sight Distance
    • ♦Overview
    • ♦Stopping Sight Distance
    • ♦Decision Sight Distance
    • ♦Passing Sight Distance
    • ♦Intersection Sight Distance
  • ►4. Horizontal Alignment
    • ♦Overview
    • ♦General Considerations for Horizontal Alignment
    • ♦Curve Radius
    • ♦Superelevation
    • ♦Sight Distance on Horizontal Curves
  • ►5. Vertical Alignment
    • ♦Overview
    • ♦Grades
    • ♦Vertical Curves
    • ♦Grade Change Without Vertical Curves
    • ♦Combination of Vertical and Horizontal Alignment
  • ►6. Cross Sectional Elements
    • ♦Overview
    • ♦Pavement Cross Slope
    • ♦Slopes and Ditches
    • ♦Median Design
    • ♦Lane Widths
    • ♦Shoulder Widths
    • ♦Sidewalks and Pedestrian Elements
    • ♦Curb and Curb and Gutters
    • ♦Roadside Design
    • ♦Horizontal Clearances to Obstructions
  • ►7. Drainage Facility Placement
    • ♦Overview
    • ♦Introduction
    • ♦Design Treatment of Cross Drainage Culvert Ends
    • ♦Parallel Drainage Culverts
    • ♦Side Ditches
  • ♦8. Roadways Intersecting Department Projects
• ►3. New Location and Reconstruction (4R) Design Criteria
  • ►1. Overview
    • ♦Introduction
  • ►2. Urban Streets
    • ♦Overview
    • ♦Level of Service
    • ♦Basic Design Features
    • ♦Medians
    • ♦Median Openings
    • ♦Borders
    • ♦Berms
    • ♦Grade Separations and Interchanges
    • ♦Right-of-Way Width
    • ♦Intersections
    • ♦Speed Change Lanes
    • ♦Auxiliary Lanes on Crest Vertical Curves
    • ♦Horizontal Offsets
    • ►Bus Facilities
    • ♦Bus Streets
  • ►3. Suburban Roadways
    • ♦Overview
    • ♦Basic Design Features
    • ♦Access Control
    • ♦Medians
    • ♦Median Openings
    • ♦Speed Change Lanes
    • ♦Right of Way Width
    • ♦Horizontal Clearances
    • ♦Borders
    • ♦Grade Separations and Interchanges
    • ♦Intersections
    • ♦Parking
  • ►4. Two-Lane Rural Highways
    • ♦Overview
    • ♦Basic Design Features
    • ♦Access Control
    • ♦Transitions to Four-Lane Divided Highways
    • ♦Passing Sight Distances
    • ♦Speed Change Lanes
    • ♦Intersections
  • ►5. Multi-Lane Rural Highways
    • ♦Overview
    • ♦Level of Service
    • ♦Basic Design Criteria
    • ♦Access Control
    • ♦Medians
    • ♦Turn Lanes
    • ♦Travel Lanes and Shoulders
    • ♦Intersections
    • ♦Transitions to Four-Lane Divided Highways
    • ♦Converting Existing Two-Lane Roadways to Four-Lane Divided Facilities
    • ♦Grade Separations and Interchanges
  • ►6. Freeways
    • ♦Overview
    • ♦Basic Design Criteria
    • ♦Access Control
    • ♦General
    • ♦Mainlane Access
    • ♦Frontage Road Access
    • ♦Driveways and Side Streets
    • ♦Methods
    • ♦Designation
    • ♦Design
    • ♦Mainlanes
    • ♦Design Speed
    • ♦Level of Service
    • ♦Lane Width and Number
    • ♦Shoulders
    • ♦Medians
    • ♦Outer Separation
    • ♦Crossing Facilities
    • ♦Vertical and Horizontal Clearance at Structures
    • ♦Frontage Roads
    • ♦Function and Uses
    • ♦Planning
    • ♦Design Speed on Frontage Roads
    • ♦Capacity and Level of Service
    • ♦Frontage Road Design Criteria
    • ♦Conversion of Frontage Roads from Two-Way to One-Way Operation
    • ♦Interchanges
    • ♦Three Leg Interchanges
    • ♦Four Leg Interchanges
    • ♦Diamond Interchanges
    • ♦Cloverleaf Interchanges
    • ♦Directional Interchanges
    • ♦Ramps and Direct Connections
    • ♦General Information
    • ♦Design Speed
    • ♦Horizontal Geometrics
    • ♦Distance Between Successive Ramps
    • ♦Cross Section and Cross Slopes
    • ♦Sight Distance
    • ♦Grades and Profiles
    • ♦Metered Ramps
    • ♦Collector-Distributor Roads
    • ♦Frontage Road Turnarounds and Intersection Approaches
  • ►7. Freeway Corridor Enhancements
    • ♦Overview
    • ♦Freeways With High Occupancy Vehicle Treatments
    • ♦Light Rail Transit
• ►4. Non-Freeway Rehabilitation (3R) Design Criteria
  • ►1. Purpose
    • ♦Overview
    • ♦Design Guidelines
  • ►2. Design Characteristics
    • ♦Pavement Design
    • ♦Geometric Design
    • ♦Design Values
    • ♦Alignment
    • ♦Design Speed
    • ♦Side and Backslopes
    • ♦Lane Widths
  • ►3. Safety Enhancements
    • ♦Overview
    • ♦Safety Design
    • ♦Project Specific Design Information
    • ♦Basic Safety Improvements
    • ♦Other Safety Enhancements
  • ►4. Frontage Roads
    • ♦Overview
  • ►5. Bridges, Including Bridge-Classification Culverts
    • ♦Overview
  • ►6. Super 2 Highways
    • ♦Passing Lanes (Super 2 Highways)
    • ♦Passing Lane Length and Spacing
    • ♦Design Criteria
• ►5. Non-Freeway Resurfacing or Restoration Projects (2R)
  • ►1. Overview
    • ♦Guidelines
• ►6. Special Facilities
  • ►1. Off-System Bridge Replacement and Rehabilitation Projects
    • ♦Project Conditions
    • ♦Design Values
  • ►2. Historically Significant Bridge Projects
    • ♦Reference for Procedures
  • ►3. Texas Parks and Wildlife Department (Park Road) Projects
    • ♦Working Agreements
  • ►4. Bicycle Facilities
    • ♦Overview
    • ♦Guidance for Bicycle Facilities
    • ♦Design Exceptions and Design Waivers for Bicycle Facilities
• ►7. Miscellaneous Design Elements
  • ►1. Longitudinal Barriers
    • ♦Overview
    • ♦Concrete Barriers (Median and Roadside)
    • ♦Guardrail
    • ♦Attenuators (Crash Cushions)
  • ►2. Fencing
    • ♦Right-of-way
    • ♦Control of Access Fencing on Freeways
  • ►3. Pedestrian Separations and Ramps
    • ♦General Requirements
    • ♦Overcrossings
    • ♦Undercrossings
  • ►4. Parking
    • ♦Overview
    • ♦Fringe Parking Lots
    • ♦Parking Along Highways and Arterial Streets
  • ►5. Shoulder Texturing
    • ♦Definition
    • ♦Types of Shoulder Texturing
    • ♦Roadway Applications of Shoulder Texturing
  • ►6. Emergency Median Openings on Freeways
    • ♦Overview
    • ♦Conditions
    • ♦Spacing of Openings
    • ♦Construction
  • ►7. Minimum Designs for Truck and Bus Turns
    • ♦Overview
    • ♦Application
    • ♦Channelization
    • ♦Alternatives to Simple Curvature
    • ♦Urban Intersections
    • ♦Rural Intersections
• ►8. Mobility Corridor (5 R) Design Criteria
  • ►1. Overview
    • ♦Introduction
  • ►2. Roadway Design Criteria
    • ♦Lane Width and Number
    • ♦Shoulders
    • ♦Pavement Cross Slope
    • ♦Vertical Clearances at Structures
    • ♦Stopping Sight Distance
    • ♦Grades
    • ♦Curve Radii
    • ♦Superelevation
    • ♦Vertical Curves
  • ►3. Roadside Design Criteria
    • ♦Horizontal Clearance
    • ♦Slopes
    • ♦Medians
  • ►4. Ramps and Direct Connections
    • ♦Overview
    • ♦Design Speed
    • ♦Lane and Shoulder Widths
    • ♦Acceleration and Deceleration Lengths
    • ♦Distance between Successive Ramps
    • ♦Grades and Profiles
    • ♦Cross Section and Cross Slopes
• ►A. Metal Beam Guardrails
  • ►1. Overview
    • ♦Introduction
  • ►2. Barrier Need
    • ♦Overview
  • ►3. Structural Considerations
    • ♦Overview
    • ♦Post Spacing, Embedment, and Lateral Support
    • ♦Rail Element
    • ♦Deflection Considerations
  • ►4. Placement of Guardrail
    • ♦Overview
    • ♦Lateral Placement at Shoulder Edge or Curb Face
    • ♦Lateral Placement Away From the Shoulder Edge
  • ►5. End Treatment of Guardrail
    • ♦Overview
  • ►6. Determining Length of Need of Barrier
    • ♦Overview
    • ♦Variables
    • ♦Design Equations
    • ♦Using Design Equations to Determine Length of Guardrail
  • ►7. Example Problems
    • ♦Example Problem 1
    • ♦Example Problem 2
    • ♦Example Problem 3
• ►B. Treatment of Pavement Drop-offs in Work Zones
  • ►1. Overview
    • ♦Scope
    • ♦Types of Treatment
    • ♦Factors Affecting Treatment Choice
    • ♦Edge Condition
    • ♦Guidelines for Treatment
    • ♦Use of Positive Barriers
• ►C. Driveway Design Guidelines
  • ♦1. Purpose
  • ►2. Introduction
    • ♦General Guidelines
    • ♦Definitions
  • ►3. Driveway Design Principles
    • ♦General Guidelines
    • ♦Geometrics for Two-Way Driveways
    • ♦Divided Driveways
  • ►4. Profiles
    • ♦Driveway Grades
    • ♦Profiles on Curb and Gutter Sections
    • ♦Profiles with Drainage Ditch
  • ♦5. Driveway Angle
  • ►6. Pedestrian Considerations
    • ♦General Guidelines
    • ♦Sidewalk and Driveway Intersections
  • ♦7. Visibility
  • ♦8. References

Roadway Design Manual

October 2006

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