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• ♦Manual Notice 2009-1
• ►Preface
• ►1. Design General
  • ►1. Overview
    • ♦Non-discrimination
    • ♦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

Manual Notice: 2009-1

From: Mark A. Marek, P.E

Manual: Roadway Design Manual

Effective Date: March 01, 2009

Purpose

This revision is intended to update the Roadway Design Manual, specifically to include TxDOT’s Nondiscrimination Policy.

Contact

Address questions concerning the information contained in this manual to the Roadway Design Section in the Design Division.

Copyright Notice

This Roadway Design Manual and all future revisions: Copyright ©2009 by the Texas Department of Transportation (TxDOT). Published by the Design Division (DES). All rights reserved.

Archives

Past manual notices are available in a pdf archive.