**Related Resources: calculators**

### 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

$y=t+\frac{v}{2\cdot a\pm 64.4\cdot G}$

Eq. 2

$r=\frac{W+l}{v}$

Eq. 3

$G}_{p}=3.2+\frac{L}{{S}_{p}}+0.27\cdot {N}_{ped$

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/sec^{2})

± G = percent grade divided by 100 (uphill grade "+")

Reference

U.S. Department of Transportation

Federal Highway Administration

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