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Roadway Design Manual (RDW) - Texas …

Roadway Design Manual Revised April 2018. 2018 by Texas Department of Transportation (512) 463-8630 all rights reserved Manual Notice 2018-1. From: Camille Thomason, Manual : Roadway Design Manual Effective Date: April 26, 2018. Purpose Roadway Design Manual updates to provide vertical clearance guidance for roadways on the Texas Highway Freight Network (THFN): To provide guidance for the THFN Design Deviation Process;. To provide an explanation and guidance for which projects on the THFN are affected by the new policy;. To provide vertical clearance criteria for applicable projects on the THFN. Contents Table of Contents The addition of the Texas Highway Freight Network (THFN) Design Deviation process to Chapter 1, Section 2. The new addition of Section 8 to Chapter 3. Chapter 1. Contents: The addition of the Texas Highway Freight Network (THFN) Design Deviation process. Section 2: The addition of a new subsection that defines the Texas Highway Freight Network (THFN) Design Deviation process.

Manual Notice 2018-1 From: Camille Thomason, P.E Manual: Roadway Design Manual Effective Date: April 26, 2018 Purpose Roadway Design Manual updates to provide vertical clearance guida nce for roadways on the Texas

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Transcription of Roadway Design Manual (RDW) - Texas …

1 Roadway Design Manual Revised April 2018. 2018 by Texas Department of Transportation (512) 463-8630 all rights reserved Manual Notice 2018-1. From: Camille Thomason, Manual : Roadway Design Manual Effective Date: April 26, 2018. Purpose Roadway Design Manual updates to provide vertical clearance guidance for roadways on the Texas Highway Freight Network (THFN): To provide guidance for the THFN Design Deviation Process;. To provide an explanation and guidance for which projects on the THFN are affected by the new policy;. To provide vertical clearance criteria for applicable projects on the THFN. Contents Table of Contents The addition of the Texas Highway Freight Network (THFN) Design Deviation process to Chapter 1, Section 2. The new addition of Section 8 to Chapter 3. Chapter 1. Contents: The addition of the Texas Highway Freight Network (THFN) Design Deviation process. Section 2: The addition of a new subsection that defines the Texas Highway Freight Network (THFN) Design Deviation process.

2 Chapter 3. Contents: Addition of the Texas Highway Freight Network (THFN) to the Contents. Section 1: Addition of the Texas Highway Freight Network (THFN) to list of Roadway classes, and cross references to Chapter 3, Section 8, and Chapter 1. Addition of reference to the THFN Design Deviation process. Section 8: New Section that explains the application of the Texas Highway Freight Network (THFN) policy. This includes the following: The policy is effective for applicable bridge construction and reconstruction projects on the THFN, Let on September 1, 2020 or later, Designation of a Roadway as being on the latest THFN map maintained by the Transportation Planning and Programming Division (TP&P), The specific vertical clearance Design criteria: ' for applicable bridge structures;. ' for pedestrian crossover structures;. ' for overhead signs;. 19' for traffic signals on a designated THFN.

3 Chapter 4. Section 5: Addition of a cross reference to Chapter 3, Section 8. Chapter 6. Section 1: Under the Project Conditions, Addition of a cross reference to Chapter 3, Section 8. Chapter 8. Section 1: In the last paragraph, the addition of a reference to the THFN Design Deviation process. Section 2: Under Vertical Clearance at Structures, the addition of a reference to Chapter 3, Section 8. Contact Contact the Roadway Design Section of the Design Division at (512) 416-2678 with any questions or comments. Archives Past Manual notices are available in a pdf archive. Table of Contents Preface Non-discrimination .. 1-1. Overview .. 1-1. Chapter 1 Design General Section 1 Overview .. 1-2. Application of Design Guidelines .. 1-2. Roadway Design Manual Format .. 1-2. External Reference Documents .. 1-3. Section 2 Design Exceptions, Design Waivers, Design Variances, and Texas Highway Freight Network (THFN) Design Deviations.

4 1-5. Overview .. 1-5. Design Exceptions .. 1-5. Design Waivers .. 1-8. Design Variances .. 1-9. Texas Highway Freight Network (THFN) Design Deviations .. 1-9. Section 3 Schematic Layouts .. 1-10. Overview .. 1-10. Section 4 Additional Access to the Interstate System.. 1-11. Requirements .. 1-11. Section 5 Preliminary Design Submissions .. 1-13. Submissions .. 1-13. Section 6 Maintenance Considerations in Design .. 1-14. Maintenance.. 1-14. Chapter 2 Basic Design Criteria Section 1 Functional Classifications .. 2-2. Overview .. 2-2. Section 2 Traffic Characteristics.. 2-3. Overview .. 2-3. Traffic Volume .. 2-3. Traffic Speed .. 2-5. Turning Roadways and Intersection Corner Radii .. 2-5. Section 3 Sight Distance .. 2-6. Overview .. 2-6. Stopping Sight Distance .. 2-6. Decision Sight Distance.. 2-7. Roadway Design Manual i TxDOT 04/2018. Passing Sight Distance.. 2-9. Intersection Sight Distance.

5 2-9. Section 4 Horizontal Alignment .. 2-10. Overview .. 2-10. General Considerations for Horizontal Alignment .. 2-10. Curve Radius .. 2-11. Superelevation Rate .. 2-12. Sight Distance on Horizontal Curves .. 2-22. Section 5 Vertical Alignment .. 2-25. Overview .. 2-25. Grades .. 2-25. Vertical Curves .. 2-28. Grade Change Without Vertical Curves .. 2-32. Combination of Vertical and Horizontal Alignment .. 2-32. Section 6 Cross Sectional Elements .. 2-33. Overview .. 2-33. Pavement Cross Slope .. 2-33. Median Design .. 2-34. Lane Widths.. 2-35. Shoulder Widths .. 2-35. Sidewalks and Pedestrian Elements.. 2-36. Curb and Curb and Gutters .. 2-42. Roadside Design .. 2-42. Slopes and Ditches.. 2-43. Lateral Offset to Obstructions .. 2-44. Clear Zone .. 2-45. Section 7 Drainage Facility Placement .. 2-47. Overview .. 2-47. Introduction .. 2-47. Design Treatment of Cross Drainage Culvert Ends.

6 2-48. Parallel Drainage Culverts.. 2-53. Side Ditches .. 2-55. Section 8 Roadways Intersecting Department Projects .. 2-56. Chapter 3 New Location and Reconstruction (4R) Design Criteria Section 1 Overview .. 3-2. Introduction .. 3-2. Section 2 Urban Streets.. 3-3. Overview .. 3-3. Roadway Design Manual ii TxDOT 04/2018. Level of Service.. 3-3. Basic Design Features .. 3-3. Medians .. 3-6. Median Openings.. 3-8. Borders.. 3-9. Berms.. 3-9. Grade Separations and Interchanges .. 3-10. Right-of-Way Width .. 3-10. Intersections.. 3-11. Speed Change Lanes .. 3-12. Auxiliary Lanes on Crest Vertical Curves.. 3-17. Horizontal Offsets .. 3-17. Bus Facilities .. 3-18. Bus Streets .. 3-18. Section 3 Suburban Roadways .. 3-19. Overview .. 3-19. Basic Design Features .. 3-19. Access Control.. 3-21. Medians .. 3-22. Median Openings.. 3-23. Speed Change Lanes .. 3-23. Right of Way Width.

7 3-23. Horizontal Clearances .. 3-23. Borders.. 3-23. Grade Separations and Interchanges .. 3-23. Intersections.. 3-23. Parking.. 3-24. Section 4 Two-Lane Rural Highways .. 3-25. Overview .. 3-25. Basic Design Features .. 3-29. Access Control.. 3-30. Transitions to Four-Lane Divided Highways .. 3-30. Passing Sight Distances .. 3-30. Speed Change Lanes .. 3-32. Intersections.. 3-36. Section 5 Multi-Lane Rural Highways .. 3-37. Overview .. 3-37. Level of Service.. 3-40. Basic Design Criteria.. 3-41. Roadway Design Manual iii TxDOT 04/2018. Access Control.. 3-41. Medians .. 3-41. Turn Lanes .. 3-43. Travel Lanes and Shoulders.. 3-47. Intersections.. 3-48. Transitions to Four-Lane Divided Highways .. 3-49. Converting Existing Two-Lane Roadways to Four-Lane Divided Facilities .. 3-50. Grade Separations and Interchanges .. 3-51. Section 6 Freeways .. 3-52. Overview .. 3-52. Basic Design Criteria.

8 3-52. Access Control.. 3-53. General.. 3-53. Mainlane Access .. 3-54. Frontage Road Access .. 3-54. Driveways and Side Streets .. 3-56. Methods .. 3-58. Designation .. 3-58. Design .. 3-59. Mainlanes.. 3-60. Design Speed .. 3-60. Level of Service.. 3-60. Lane Width and Number .. 3-61. Shoulders .. 3-62. Medians .. 3-62. Outer Separation .. 3-62. Crossing Facilities .. 3-63. Vertical and Horizontal Clearance at Structures .. 3-63. Frontage Roads .. 3-65. Function and Uses .. 3-65. Planning .. 3-66. Design Speed on Frontage Roads .. 3-66. Capacity and Level of Service.. 3-67. Frontage Road Design Criteria .. 3-67. Conversion of Frontage Roads from Two-Way to One-Way Operation.. 3-69. Interchanges.. 3-70. Three Leg Interchanges .. 3-71. Four Leg Interchanges .. 3-72. Diamond Interchanges .. 3-72. Cloverleaf Interchanges .. 3-78. Roadway Design Manual iv TxDOT 04/2018. Directional Interchanges.

9 3-80. Ramps and Direct Connections .. 3-82. General Information.. 3-83. Design Speed .. 3-90. Horizontal Geometrics.. 3-90. Distance Between Successive Ramps .. 3-91. Cross Section and Cross Slopes.. 3-92. Sight Distance .. 3-94. Grades and Profiles .. 3-95. Metered Ramps .. 3-95. Collector-Distributor Roads.. 3-95. Frontage Road Turnarounds and Intersection Approaches .. 3-95. Section 7 Freeway Corridor Enhancements .. 3-97. Overview .. 3-97. Freeways With High Occupancy Vehicle Treatments.. 3-97. Light Rail Transit.. 3-97. Section 8 Texas Highway Freeway Network (THFN) .. 3-98. Overview .. 3-98. Basic Design Criteria.. 3-99. Vertical Clearance at Structures .. 3-99. Signs, Overhead Sign Bridges (OSB's), Signals .. 3-99. Other Overhead Utilities .. 3-99. Chapter 4 Non-Freeway Rehabilitation (3R) Design Criteria Section 1 Purpose .. 4-2. Overview .. 4-2. Design Guidelines.

10 4-2. Section 2 Design Characteristics.. 4-3. Pavement Design .. 4-3. Geometric Design .. 4-3. Design Values .. 4-6. Alignment .. 4-6. Design Speed .. 4-7. Side and Backslopes .. 4-7. Lane Widths.. 4-7. Section 3 Safety Enhancements .. 4-8. Overview .. 4-8. Safety Design .. 4-8. Project Specific Design Information .. 4-9. Roadway Design Manual v TxDOT 04/2018. Basic Safety Improvements .. 4-10. Other Safety Enhancements.. 4-11. Section 4 Frontage Roads .. 4-12. Overview .. 4-12. Section 5 Bridges, Including Bridge-Classification Culverts .. 4-14. Overview .. 4-14. Section 6 Super 2 Highways .. 4-15. Overview .. 4-15. Basic Design Criteria.. 4-16. Chapter 5 Non-Freeway Resurfacing or Restoration Projects (2R). Section 1 Overview .. 5-2. Guidelines .. 5-2. Chapter 6 Special Facilities Section 1 Off-System Bridge Replacement and Rehabilitation Projects .. 6-2. Project Conditions.


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