Stopping Sight Distance

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on

Jul 24, 2020, 6:28:07 PM

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on

Jul 11, 2016, 7:28:39 PM

S S D = 1.47 \cdot v \cdot t + 1.075 \cdot \frac{v^{2}}{a}

$SSD = 1.47*v*t+1.075*v^2/a$

(v) Design speed

$(v)"Design speed"$

(t) Reaction time

$(t)"Reaction time"$

(a) Deceleration rate

$(a)"Deceleration rate"$

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The Stopping Sight Distance is used in road design. It is a near worst-case distance a vehicle driver needs to be able to see in order to have room to stop before colliding with something in the roadway, such as a pedestrian in a crosswalk, a stopped vehicle, or road debris. Insufficient sight distance can adversely affect the safety or operations of a roadway or intersection. Stopping sight distance is the distance traveled during the two phases of stopping a vehicle: perception-reaction time and maneuver time. The following formula is used: $S S D = 1.47 v t + 1.075 \frac{v^{2}}{a}$ $SSD=1.47vt+1.075v^2/a$ , where:

$v$ $v$ = design speed
$t$ $t$ = reaction time
$a$ $a$ = deceleration time

References

The formula and definition are from Wikipedia (https://en.wikipedia.org/wiki/Stopping_sight_distance).

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Stopping Sight Distance

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