Traffic Safety Impact Assessment Analyzer
Analyze traffic safety impacts and hazard mitigation for transportation designs
What You Can Do
You can conduct comprehensive safety impact assessments for any transportation design intervention—from intersection redesigns to speed reduction corridors. The skill guides you through hazard identification, risk quantification using established methodologies (conflict studies, crash prediction models), and evidence-based mitigation development. You'll produce defensible safety documentation suitable for audits, litigation, and project approvals.
Features
Systematically catalog hazard categories relevant to your specific design changes (conflict points, sight distance issues, speed impacts, access concerns)
Apply crash prediction models, conflict analysis, and speed assessment methods to establish baseline and post-design safety metrics
Automatically check design decisions against MUTCD, AASHTO, and warrant requirements for signals, markings, and control devices
Generate evidence-based countermeasures with effectiveness ratings tied to crash reduction factors from published literature
Structure safety comparisons to demonstrate improvement outcomes and support project approvals or retrofits
Evaluate protection levels for vulnerable users including refuge islands, signal timing, and dedicated facilities
Prioritize hazard mitigation for locations with documented crash histories using data-driven countermeasure selection
Format findings for compliance review, litigation defensibility, and stakeholder communication
Example Output
Intersection Redesign Assessment:
- Hazards identified: (5) Reduced sight distance at northwest corner, high-speed right-turns, pedestrian exposure during signal gaps, bicycle conflict at protected turn phase, sight obstruction by landscaping
- Risk quantification: Baseline crash prediction 2.8 crashes/year; post-design model 1.9 crashes/year (32% reduction)
- Recommended mitigations: Remove corner landscaping (sight distance recovery), add protected right-turn phase (reduces conflicts by 0.6 crashes/year per AASHTO), install 4-inch curb extension (pedestrian refuge, reduces exposure)
- Standards compliance: Signal timing meets MUTCD minimum 7.5-second pedestrian crossing clearance; turn lane meets AASHTO on-street design standards
Speed Reduction Corridor Safety Analysis:
- Hazard categories: Speeding vehicles (85th percentile 38 mph, 8 mph over target), midblock crossing exposure, sightline obstruction at driveways
- Countermeasure effectiveness: Chicane installation (4-5 mph reduction per ITE), edge line narrowing (perception-based reduction 2-3 mph), rumble strips (auditory alert)
- Combined estimate: 85th percentile reduced to 30 mph; crash severity metrics improve 35-40% for pedestrian impacts at predicted speeds
- Warrant documentation: Pedestrian volume 850/day exceeds 250-pedestrian threshold for protected crossing; midblock facility warranted per MUTCD Table 4C-1
What's Included
- SKILL.md instruction file with hazard taxonomy and analysis framework:
- Safety impact assessment template (hazard identification, risk quantification, mitigation matrix):
- MUTCD/AASHTO warrant checklist and standard cross-reference guide:
- Crash prediction model reference sheet (HSM 2nd Edition, local agency coefficients):
- Before-and-after safety comparison worksheet with documentation prompts:
- Countermeasure effectiveness database excerpt (crash reduction factors by facility type):
- Litigation-ready documentation checklist for design decisions:
Who It's For
- Traffic engineers and safety engineers conducting intersection or corridor redesigns
- Transportation planners evaluating high-crash location countermeasures
- Civil engineers preparing safety assessments for design approvals or audits
- Transit agencies analyzing signal priority or geometric modification impacts
- Municipal engineering staff documenting before-and-after safety improvements
- Consultants defending design decisions in peer reviews or litigation
Best For
- Intersection geometry, signal timing, or turn-lane redesigns
- Speed reduction and traffic calming corridor evaluations
- Protected bike lane, pedestrian refuge, or midblock crossing installations
- High-crash location countermeasure selection and prioritization
- Roundabout or all-way stop conversion feasibility assessments
- Safety audits and before-and-after project documentation
- Warrant analysis for traffic control devices (signals, stops, markings)
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