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Traffic Signal Timing Calculator

Civil Engineering Application & Design Resources

Traffic Signal Timing Calculator

Signal timing is a collection of parameters and logic designed to allocate the right-of-way at a signalized intersection.

Preview: Traffic Signal Timing Calculator

Eq.1
${\displaystyle y=t+\frac{v}{2\cdot <!--\; \cdot \; -->a\pm <!--\; \pm \; -->64.4\cdot <!--\; \cdot \; -->G}}$

Eq. 2
${\displaystyle r=\frac{W+l}{v}}$

Eq. 3
${\displaystyle G_p=3.2+\frac{L}{S_p}+0.27\cdot <!--\; \cdot \; -->N_{ped}}$

Where

t = driver reaction time (sec)
v = vehicle approach speed (ft/sec)
W = width of intersection, curb-to-curb (ft)
l = length of vehicle (ft)
y = length of yellow interval to nearest 0.1 sec (sec)
r = length of red clearance interval to nearest 0.1 sec (sec)
G_p = minimum green time for pedestrians (sec)
L = crosswalk length (ft) Sp = pedestrian speed (ft/sec), default 3.5 ft/sec
N_ped= number of pedestrian in interval a = deceleration rate (ft/sec²)
± G = percent grade divided by 100 (uphill grade "+")

Reference
U.S. Department of Transportation
Federal Highway Administration

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