2026 TxDOT Roadway Design Manual Updates – What Changed for Texas Developers & Contractors
- Mar 16
- 2 min read
JRH Engineering & Environmental Services is the premier provider of civil engineering and structural engineering design solutions in the states of Texas, North Carolina, and Florida.
With our low-overhead business model, we deliver projects "Done Quickly. Done Right. And for the Best Value."
The Texas Department of Transportation released a major revision to the Roadway Design Manual in November 2024.
These changes are now affecting subdivision streets, intersections, and drainage in high-growth areas like DFW, Houston, and Austin.
This post breaks down the most important updates and how JRH can help you navigate them efficiently.
Chapter 4 – Basic Design Criteria (Updated Drainage Requirements)
Stronger emphasis on urban and suburban context in rapidly growing corridors
Revised guidance for cross-drainage culverts, side ditches, and outfalls
New requirements when subdivision streets intersect TxDOT facilities
How this impacts grading and drainage plans for new developments
Chapter 13 – Intersections (Safety & Multimodal Focus)
Updated design criteria for right-turn slip lanes and intersection functional areas
Increased requirements for pedestrian and bicycle accommodations
Enhanced safety provisions for older drivers and vulnerable road users
Implications for subdivision entrance intersections and internal street crossings
Chapter 14 – Alternative Intersections (Roundabouts & Innovative Designs)
Expanded guidance on roundabouts, diverging diamond interchanges (DDI), and median U-turns
Why these designs are being recommended in suburban DFW and Austin growth zones
Benefits: improved safety, reduced delay, and lower long-term maintenance costs
Houston District Drainage Guidelines (July 2025 Update)
Updated criteria for pump discharge, diverted drainage areas, and turn-lane hydraulics
Stronger alignment with local IDM and TxDOT standards in the Houston area
How JRH coordinates these requirements to prevent delays
How JRH Helps Texas Clients Stay Ahead of These Changes
Fast, compliant designs that meet the latest TxDOT standards
Low-overhead model that saves time and money on subdivision and roadway projects
Full permitting support and coordination with TxDOT districts
Internal links: Home, About Us, Civil Engineering Services, Texas Service Areas
Planning a subdivision or roadway improvement in Texas?
Contact JRH requesting “TXDOT” or similar consultations for North Carolina or Florida or call 800-227-9635 during business hours for a free 15-minute review of how the 2026 DOT updates affect your project.
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