Traffic Operations

Traffic Signal Timing & Cycle Calculator

Calculate clearance intervals (Yellow/Red), pedestrian green times, and optimum cycle length using standard ITE and Webster's formulas.

Vehicle Clearance (y, r)

Approach Speed (mph)

Grade (%)

Intersection Width (ft)

Vehicle Length (ft)

Driver Characteristics

Reaction Time (t, sec)

Deceleration (a, ft/s²)

Crosswalk Length (ft)

No. of Pedestrians (N)

Walking Speed (Sp, ft/s)

Lost Time per Phase (s)

All Red Time Total (s)

Phase Flows (vph)

Live Sync

sec

y = t + v / (2a ± 64.4G)

sec

r = (W + l) / v

sec

Gp = 3.2 + (L / Sp) + (0.27 × N)

Co = (1.5L + 5) / (1 - Y)

Total Flow Ratio (Y):

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