The Stopping Sight Distance (SSD) on a level highway depends on vehicle speed (v), driver reaction time (t), and coefficient of longitudinal friction (f) as:
Av*t + v² / (2 * g * f)
Bv*t + v² / (g * f)
Cv*t + v / (2 * g * f)
D2*v*t + v² / (2 * g * f)
Explanation
SSD consists of lag distance (v*t) plus braking distance [v² / (2*g*f)].

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