05 Staff briefing regarding the Traffic Impact Analysis (TIA) process and how it relates to zoning — original pdf

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Transportation Analyses at Zoning Austin Transportation & Public Works | May 5, 2026 Curtis P. Beaty, P.E. Briefing Topics  Triggers for a transportation analysis  Types of transportation analyses at zoning  Other transportation analyses 2 Triggers for a Transportation Analysis  LDC – Chapter 26-6 ARTICLE 3. - TRAFFIC IMPACT ANALYSIS AND MITIGATION  § 25-6-113 - TRAFFIC IMPACT ANALYSIS REQUIRED: “…if the expected number of trips generated by a project exceeds 2,000 vehicle trips per day.”  § 25-6-114 - NEIGHBORHOOD TRAFFIC ANALYSIS REQUIRED: o Development on a residential (Level 1) or collector street (Level 2) o Development will add more than 300 vehicles trips per day to the street o Street that development accesses has more than 50% frontage of SF1-SF5 designated lots o Only consider from development’s property line to nearest arterial (Level 3 or 4 street) o Each street segment/block to be considered independently 3 Triggers for a Transportation Analysis  ITE Trip Generation Manual (v 12)  Forecasts the number and type of daily trips generated by a proposed development  Based on land use, land setting, and proposed intensities  Documented in the “TIA Determination Worksheet” 4 Types of Transportation Analyses At Zoning/Re-zoning Types of Analyses  Zoning Transportation Analysis (ZTA):  Unknowns at Zoning:  Trip generation estimates  TDM considerations  Bike/Ped considerations  Street capacity analysis  Proposed driveway access locations/considerations  ROW needs per ASMP  Actual driveway locations  Actual land uses/intensities  Site’s functionality  Specific TDM plan  Potential waiver requests  Phasing plan and build-out year(s) Specific Mitigations Deferred to Site Plan 6 Types of Analyses  Neighborhood Traffic Analysis (NTA):  Specific triggers  “…a simplified analysis that assesses the effect of a proposed project on a residential street.”  Limited in scope  Existing traffic  Projected operating level  Potential mitigations 7 Neighborhood Traffic Analysis (NTA) Proposed site does not take access to this street block: no NTA required Site takes access to street and street block exceeds 50% SF1-SF5 frontage: NTA required & Development will add more than 300 daily vehicle trips to street: NTA required Site takes access to street, but street block has less than 50% SF1-SF5 frontage: no NTA required 8 Neighborhood Traffic Analysis (NTA) • Measured Face-of-Curb to Face-of Curb • Not a maximum capacity • Actual traffic volumes can exceed these thresholds • Other street characteristics taken into consideration 9 Exceptions at Zoning  Planned Unit Developments (PUDs):  Full Transportation Impact Analysis (TIA) required (if over 2,000 daily vehicle trips)  Transportation Demand Management (TDM) must be incorporated  Specific mitigations identified  TIA memo referenced within the PUD ordinance 10 Transportation Analyses at Zoning Austin Transportation & Public Works | May 5, 2026 Curtis P. Beaty, P.E.