Explain equation for change interval, Civil Engineering

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Explain equation for Change Interval

y = t + v / 2a + 64.4G

Where: y = length of yellow interval (sec)

t = driver perception/reaction time (1.0 sec generally used)

v = velocity of approaching vehicle (fps)

a = deceleration rate (10 fps2 generally used)

G = grade of approach (percent/100)

If G is positive percent or upgrade, use '+' symbol

If G is negative percent or downhill, use '-' symbol

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