Traffic Signal Timing Optimization
Generate optimized signal timing plans and coordination strategies for intersections
What You Can Do
Input intersection traffic counts, geometry, and constraints, and Claude calculates optimized cycle lengths, green time splits, and coordination strategies across multiple signalized intersections. You get actionable timing recommendations with documented trade-offs, phasing logic, and peak-period adjustments—ready for field testing or simulation validation. This skill handles the complex calculations and competing demands that signal engineers face when balancing vehicular flow, pedestrian accommodation, and adjacent intersection coordination.
Features
calculates ideal cycle lengths based on traffic volumes, intersection geometry, and saturation flow rates
distributes green time among competing movements while accommodating pedestrian crossing times and all-red clearance intervals
generates timing offsets for adjacent intersections to create green waves and minimize overall corridor delay
compares different signal phasing schemes (protected/permitted turns, leading/lagging pedestrian phases) and their impact on capacity
clearly explains constraints, assumptions, and compromises between conflicting objectives (delay vs. safety vs. pedestrian accommodation)
develops timing plans across adjacent signals with documented coordination bandwidth and progression windows
recommends time-of-day timing plan variations and transition strategies for demand shifts
Example Output
Example 1: Single Intersection Optimization
Input: Northbound 450 vph, Southbound 380 vph, Eastbound 320 vph, Westbound 290 vph; intersection 90' × 80'; existing 90-second cycle
Output:
- Recommended cycle length: 100 seconds
- Phase 1 (N/S through): 55 seconds green
- Phase 2 (E/W through): 38 seconds green
- All-red clearance: 4 seconds each phase
- Estimated delay reduction: 12–15%
Example 2: Corridor Coordination Plan
Input: Three intersections along Main Street, 400-foot spacing; coordinated demand pattern
Output:
- Common cycle length: 120 seconds
- Intersection A offset: 0 seconds (reference)
- Intersection B offset: 38 seconds (creates 18-second green band)
- Intersection C offset: 72 seconds (extends progression)
- Expected corridor travel time: 2:15 min (vs. 2:50 min uncoordinated)
What's Included
- SKILL.md: complete instruction file with skill overview, when-to-use guidance, and methodology framework
- Traffic Count Data Template: structured worksheet for documenting volumes, peak-hour factors, and directional splits
- Cycle Length Calculation Worksheet: step-by-step guide with formulas for Webster's method and HCM-based approaches
- Phase Split Checklist: requirements for green time allocation, pedestrian timing, and clearance intervals
- Coordination Strategy Worksheet: multi-intersection timing plan with offset calculations and bandwidth documentation
Who It's For
- Traffic signal engineers — optimizing timing plans for existing or new signalized intersections
- Transportation planners — evaluating signal timing impacts during corridor or network studies
- Civil engineers — generating signal timing requirements for development impact analyses
- Public works managers — preparing timing plans and alternatives for stakeholder review
- Traffic consultants — rapidly developing initial recommendations before detailed microsimulation modeling
Best For
- Initial signal timing plan development from traffic count data
- Existing timing evaluation and optimization recommendations
- Corridor coordination strategy development across multiple adjacent intersections
- Comparison of alternative phasing schemes and their operational impacts
- Documentation of timing logic and trade-offs for peer review or public meetings
- Quick generation of timing alternatives for what-if scenarios and impact analysis
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