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The update includes a correspondence table mapping prior chapter structure to a revised layout and expands coverage across performance-based practical design, context considerations, and baseline geometric design criteria. It also adds new or updated chapters on alternative intersections, interchange design, driveways, roadside safety, and active transportation facilities, with revised reference and index 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\nEffective Date: 11/15/2024  \nPurpose  \nThe Roadway Design Manual has been revised, reorganized, and reformatted to update to the current national guidance, national standards, state-of-the-practice, recent  \ntransportation research, recent transportation policies, and new topics.  \nContents  \nA correspondence Table reflecting the reorganization of the Manual is below:  \n\n| RDM (Update) | Current RDM (REV. 2) |\n| --- | --- |\n| (Chapter) | (Chapter) |\n|  |  |\n| Chapter 1 (General Guidance) | Chapter 1 (Design General) |\n| Chapter 2 (Performance Based Practical Design) -New Chapter/Topic | N/A |\n| Chapter 3 (Context and Facility Type Considerations) -New Chapter/Topic | N/A |\n| Chapter 4 (Basic Design Criteria) | Chapter 2 (Basic Design Criteria) |\n| Chapter 5 (Local Roadways 4R) | Chapter 3 (4R Design Criteria) |\n| Chapter 6 (Collectors 4R) | Chapter 3 (4R Design Criteria) |\n| Chapter 7 (Arterials 4R) | Chapter 3 (4R Design Criteria) |\n| Chapter 8 (Freeways 4R) | Chapter 3 (4R Design Criteria) |\n| Chapter 9 (Mobility Corridor Facilities 5R) | Chapter 8 (5R Design Criteria) |\n| Chapter 10 (3R Design Criteria) | Chapter 4 (3R Design Criteria) |\n| Chapter 11 (2R Design Criteria) | Chapter 5 (2R Design Criteria) |\n| Chapter 12 (Special Facilities) | Chapter 6 (Special Facilities) |\n| Chapter 13 (Intersections) | Chapter 2, Section 4 & 6, Chapter 3, & Appendix D (Right Turn Slip Lane Design Guidelines) |\n\nTable of Contents Instructions Reference Links  \n\n| Chapter 14 (Alternative Intersection and Interchange Design) | Appendix E (Alternative Intersections and Interchanges) |\n| --- | --- |\n| Chapter 15 (Grade Separations and Interchanges) | Chapter 3 (4R Design Criteria) |\n| Chapter 16 (Driveways) | Appendix C (Driveway Design Guidelines) |\n| Chapter 17 (Roadside Safety Design and Roadside Safety Hardware) | Chapter 7, Section 1, and Appendix A (Longitudinal Barriers) |\n| Chapter 18 (Bicycle Facilities) | Chapter 6, Section 4 |\n| Chapter 19 (Pedestrian Facilities) | Chapter 7, Section 3 |\n| Chapter 20 (Motorcyclist Design Consideration) -New Chapter/Topic | N/A |\n| Chapter 21 (Texas Highway Freight Network, Texas Trunk System, NHS, and STRAHNET) | Chapter 3 (4R Design Criteria) |\n| Chapter 22 (Transit Facilities) -New Chapter/Topic | N/A |\n| Chapter 23 (Temporary Traffic Control) -New Chapter/Topic | N/A |\n| Chapter 24 (Other Design Elements) | New Material + Chapter 7, Section 2 (Fencing) |\n| Chapter 25 (Index) | N/A |\n| Appendix A (Minimum Values for Design Exceptions) | Respective Minimum criteria values from applicable Chapters |\n| Appendix B (Minimum values for Design Waivers) | Respective Minimum criteria values from applicable Chapters |\n| Appendix C (List of References) | N/A |\n\nRoadway Design Manual Format:  \nChapter 1 (General Guidance) describes the design elements that require Design Exceptions, Design Waivers, Design Variances, and the Texas Highway Freight Network’s Design Deviations. Also includes references for schematic design, access control, preliminary engineering, and maintenance in design.  \nChapter 2 (Performance Based Practical Design) discusses the concepts and application of performance-based practical design. Also added guidance from recent research NCHRP 785 (Performance-Based Analysis of Geometric Design of Highways and Streets) and NCHRP 839 (A Performance-Based Highway Geometric Design Process) .  \nChapter 3 (Context and Facility Type Considerations) describes the five context classifications (urban, suburban, rural, rural town, & urban core) along with considerations for all modes of users and traffic networks. Context approach brought into alignment with AASHTO Greenbook and recent NCHRP research.  \nChapter 4 (Basic Design Criteria) presents basic design criteria. Portions ofthis section will have application to all projects to varying ","cbCaiqFepSBg3FON","https://ap.wps.com/l/cbCaiqFepSBg3FON","pdf",56547920,879,"English","# Manual Notice 2024-1\n## Purpose\n## Contents Correspondence (RDM Update vs Current RDM)\n## Chapter 1 (General Guidance)\n## Chapter 2 (Performance Based Practical Design)\n## Chapter 3 (Context and Facility Type Considerations)\n## Chapter 4 (Basic Design Criteria)\n## Chapter 5-8 (4R Design Criteria for Roadway Types)\n## Chapter 9 (Mobility Corridor Facilities 5R)\n## Appendices (Design Exceptions/Waivers and References)","[{\"question\":\"What is the purpose of the Roadway Design Manual revision effective 11/15/2024?\",\"answer\":\"It revises, reorganizes, and reformats the manual to update roadway design guidance to current national and state-of-the-practice standards, supported by recent transportation research and policies.\"},{\"question\":\"How does the manual incorporate performance-based practical design?\",\"answer\":\"It includes concepts and application guidance for performance-based practical design, with added references from NCHRP 785 and NCHRP 839.\"},{\"question\":\"What kinds of design topics and roadway facilities are covered across the chapters?\",\"answer\":\"Coverage spans context classifications and user/mode considerations, basic geometric design criteria (e.g., alignment, drainage, sight distance), 4R design criteria for multiple roadway types, mobility corridor 5R guidance, and additional chapters for intersections, driveways, roadside safety, bicycle and pedestrian facilities.\"}]","Roadway Design Manual - Manual Notice 2024-1 | PDF",1792882872,2215]