Red Light Braking
Model and Formulas

Red light equations and models
for worse case braking distance,
deceleration, and braking g's.

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Braking Distance

Braking Distance (d_b)
d_b = d_y - d_r - d_i - L
d_b = v t_y - v t_r - d_i - L

ty = Yellow Light Duration dy = Distance traveled during Yellow tr = Driver Reaction Time dr = Driver React Distance

v = Vehicle Speed L = Vehicle Length db = Braking Distance di = Stop to Violation Line Distance

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Deceleration (-a)

a = -v² / 2 d_b + G g

G = Road Grade, Negative (-) for Downhill g = 32.174 ft / sec2 (Earth's Gravity Constant)

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Braking g's (B_g)

Deceleration Compared to
Gravity Acceleration Constant

Bg = a / g

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