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Sight Distance SSD is s the minimum distance between two vehicles moving along a curve, when the driver of one vehicle can just see the other vehicle on the road. Check FAQs
SD=800hLc(g1)-(g2)
SD - Sight Distance SSD?h - Height of Vertical Curves?Lc - Length of Curve?g1 - Upgrade?g2 - Downgrade?

Sight Distance when S is Less than L and h1 and h2 are same Example

With values
With units
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Here is how the Sight Distance when S is Less than L and h1 and h2 are same equation looks like with Values.

Here is how the Sight Distance when S is Less than L and h1 and h2 are same equation looks like with Units.

Here is how the Sight Distance when S is Less than L and h1 and h2 are same equation looks like.

475.8378Edit=8001.7Edit616Edit(2.2Edit)-(-1.5Edit)
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Sight Distance when S is Less than L and h1 and h2 are same Solution

Follow our step by step solution on how to calculate Sight Distance when S is Less than L and h1 and h2 are same?

FIRST Step Consider the formula
SD=800hLc(g1)-(g2)
Next Step Substitute values of Variables
SD=8001.7m616m(2.2)-(-1.5)
Next Step Prepare to Evaluate
SD=8001.7616(2.2)-(-1.5)
Next Step Evaluate
SD=475.837810205979m
LAST Step Rounding Answer
SD=475.8378m

Sight Distance when S is Less than L and h1 and h2 are same Formula Elements

Variables
Functions
Sight Distance SSD
Sight Distance SSD is s the minimum distance between two vehicles moving along a curve, when the driver of one vehicle can just see the other vehicle on the road.
Symbol: SD
Measurement: LengthUnit: m
Note: Value can be positive or negative.
Height of Vertical Curves
Height of Vertical Curves is the distance between the lowest and highest points of a person standing upright.
Symbol: h
Measurement: LengthUnit: m
Note: Value can be positive or negative.
Length of Curve
Length of Curve is determined by the permissible rate of change of grade or from centrifugal consideration as appropriate.
Symbol: Lc
Measurement: LengthUnit: m
Note: Value can be positive or negative.
Upgrade
Upgrade is the gradient or the slope which is towards the crest of a curve. Mentioned by %.
Symbol: g1
Measurement: NAUnit: Unitless
Note: Value can be positive or negative.
Downgrade
Downgrade is the gradient or the slope which is guided to the downward direction of a curve. Mentioned by %.
Symbol: g2
Measurement: NAUnit: Unitless
Note: Value can be positive or negative.
sqrt
A square root function is a function that takes a non-negative number as an input and returns the square root of the given input number.
Syntax: sqrt(Number)

Other Formulas to find Sight Distance SSD

​Go Sight Distance when Length of Curve is Less
SD=0.5Lc+100(H+h2)2(g1)-(g2)
​Go Sight Distance when Length of Curve is Less and Both Height of Observer and Object is Same
SD=(Lc2)+(400h(g1)-(g2))

Other formulas in Surveying Vertical Curves category

​Go Length of Vertical Curve
L=NPN
​Go Change of Grade given Length
N=LPN
​Go Permissible Grade given Length
PN=NL
​Go Length of Curve Based on Centrifugal Ratio
Lc=((g1)-(g2))V2100f

How to Evaluate Sight Distance when S is Less than L and h1 and h2 are same?

Sight Distance when S is Less than L and h1 and h2 are same evaluator uses Sight Distance SSD = sqrt((800*Height of Vertical Curves*Length of Curve)/((Upgrade)-(Downgrade))) to evaluate the Sight Distance SSD, The Sight Distance when S is Less than L and h1 and h2 are same is defined for a situation where both the height of vehicles are same. Sight Distance SSD is denoted by SD symbol.

How to evaluate Sight Distance when S is Less than L and h1 and h2 are same using this online evaluator? To use this online evaluator for Sight Distance when S is Less than L and h1 and h2 are same, enter Height of Vertical Curves (h), Length of Curve (Lc), Upgrade (g1) & Downgrade (g2) and hit the calculate button.

FAQs on Sight Distance when S is Less than L and h1 and h2 are same

What is the formula to find Sight Distance when S is Less than L and h1 and h2 are same?
The formula of Sight Distance when S is Less than L and h1 and h2 are same is expressed as Sight Distance SSD = sqrt((800*Height of Vertical Curves*Length of Curve)/((Upgrade)-(Downgrade))). Here is an example- 475.8378 = sqrt((800*1.7*616)/((2.2)-((-1.5)))).
How to calculate Sight Distance when S is Less than L and h1 and h2 are same?
With Height of Vertical Curves (h), Length of Curve (Lc), Upgrade (g1) & Downgrade (g2) we can find Sight Distance when S is Less than L and h1 and h2 are same using the formula - Sight Distance SSD = sqrt((800*Height of Vertical Curves*Length of Curve)/((Upgrade)-(Downgrade))). This formula also uses Square Root (sqrt) function(s).
What are the other ways to Calculate Sight Distance SSD?
Here are the different ways to Calculate Sight Distance SSD-
  • Sight Distance SSD=0.5*Length of Curve+(100*(sqrt(Height of Observer)+sqrt(Height of Object))^2)/((Upgrade)-(Downgrade))OpenImg
  • Sight Distance SSD=(Length of Curve/2)+(400*Height of Vertical Curves/((Upgrade)-(Downgrade)))OpenImg
Can the Sight Distance when S is Less than L and h1 and h2 are same be negative?
Yes, the Sight Distance when S is Less than L and h1 and h2 are same, measured in Length can be negative.
Which unit is used to measure Sight Distance when S is Less than L and h1 and h2 are same?
Sight Distance when S is Less than L and h1 and h2 are same is usually measured using the Meter[m] for Length. Millimeter[m], Kilometer[m], Decimeter[m] are the few other units in which Sight Distance when S is Less than L and h1 and h2 are same can be measured.
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