North Street

⚠ ΔT threshold exceeded — 15.84 min > 6.00 min limit

Road classification	Two-lane highway · 25 mph · 1 lanes
HCM raw capacity	1125 vph
Hazard zone	Non-FHSZ
Degradation factor	100% of HCM
Effective capacity	1125 vph

ΔT = 15.84 min (limit 6.00 min) +9.84 min over

Limit: 6.00 min = 120 min safe egress × 5% project share (NIST TN 2135)

Mob rate (NFPA 101 constant)	90%
Project vehicles	128.2 vph
Vehicle ΔT	6.84 min
Egress penalty	+9.0 min

ΔT = (project vehicles ÷ effective capacity) × 60 + egress penalty
Sources: HCM 2022 (capacity) · NFPA 101 (mob rate) · NFPA 101/IBC (egress) · NIST TN 2135 (safe egress window)