Traffic Impact Analysis Assistant
Generate comprehensive traffic impact assessments and DOT-compliant mitigation reports
What You Can Do
This skill structures the complete TIA workflow for civil engineers and transportation planners, guiding you through critical data collection, vehicle trip demand calculations, roadway deficiency identification, and mitigation measure evaluation. You'll generate methodologically consistent analyses that satisfy DOT and local agency requirements, identify the most effective mitigation strategies (turn lanes, signal timing, access modifications), and produce professional reports with alternatives analysis that defend your conclusions in public meetings and formal submissions.
Features
Calculate vehicle trip demand using ITE methodologies and project-specific land use parameters
Identify intersections and segments failing LOS standards and quantify capacity shortfalls
Generate site-specific recommendations (turn lanes, signal retiming, access modifications) with effectiveness estimates
Compare multiple site access scenarios and development phasing options with traffic outcomes
Ensure scope and methodology align with DOT/local agency thresholds and submission requirements
Structure existing conditions assessment including peak-hour traffic counts, geometric surveys, and signal timing inventory
Produce professional TIA reports with executive summaries, methodology sections, findings, and recommendations ready for agency review
Example Output
Trip Generation Summary:
- Proposed 150-unit residential development: 1,200 AM trips, 1,350 PM trips
- Retail component 25,000 SF: 450 AM trips, 675 PM trips
- Total project: ~2,100 PM peak hour trips
Deficiency Findings:
- Main St/Oak Ave intersection: Currently LOS D (v/c 0.89), with project traffic becomes LOS F (v/c 1.14)
- Recommend: Westbound left-turn lane, signal retiming, access via alternate route
Mitigation Effectiveness:
- Proposed left-turn lane reduces Main St/Oak intersection v/c to 0.94 (LOS E acceptable)
- Access via Elm Ave distributes 40% of site traffic, further reducing Main St impact
- Cost-benefit analysis supports recommended phasing aligned with infrastructure improvements
What's Included
- SKILL.md instruction file with TIA process workflow and best practices:
- Trip Generation Calculation Template with ITE land use categories and adjustment factors:
- Deficiency Analysis Worksheet for LOS calculations and capacity evaluation:
- Mitigation Measure Evaluation Checklist covering signal timing, geometric improvements, and demand management:
- TIA Report Outline with executive summary, methodology, findings, and recommendations sections:
- Data Collection Guidance for counts, geometrics, and existing conditions documentation:
Who It's For
- Civil engineers designing development projects requiring traffic study approval
- Transportation planners preparing TIA scopes and reviewing submissions
- Site development consultants managing multi-disciplinary project teams
- Traffic engineers evaluating mitigation measure effectiveness and cost-benefit
- Development managers coordinating agency approvals and public agency coordination
Best For
- Generating preliminary trip demand estimates and impact screening
- Identifying roadway segments requiring mitigation and calculating LOS deficiencies
- Evaluating turn lane, signal timing, and access modification effectiveness
- Comparing alternative site access scenarios with quantified traffic outcomes
- Producing professional TIA reports with defensible methodology and agency-compliant documentation
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