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Sight Distance in Vertical alignment Formulas

Sight Distance 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. And is denoted by S. Sight Distance is usually measured using the Meter for Length. Note that the value of Sight Distance is always positive.

Formulas to find Sight Distance in Vertical alignment

fxSight Distance given Length of Summit Curve​Go
fxSight Distance More than Length of Summit Curve​Go
fxSight Distance Given Angle Grades​Go

Vertical alignment formulas that make use of Sight Distance

fxLength of Summit Curve given Deviation Angle and Sight Distance​Go
fxDeviation Angle given Length of Summit Curve​Go
fxDeviation Angle given Length of Summit Curve Less than Sight Distance​Go
fxLength of Summit Curve Less than Sight Distance​Go
fxLength of Valley Curve Greater than Stopping Sight Distance​Go
fxInclination Angle given Length of Valley Curve Greater than Stopping Sight Distance​Go
fxDeviation Angle given Length of Valley Curve Greater than Stopping Sight Distance​Go
fxDriver Eye Height given Length of Valley Curve Greater than Stopping Sight Distance​Go
fxLength of Valley Curve Less than Stopping Sight Distance​Go
fxDeviation Angle Given Length of Valley Curve Less than Stopping Sight Distance​Go
fxInclination Angle given Length of Valley Curve Less than Stopping Sight Distance​Go
fxDriver Sight Height given Length of Valley Curve Less than Stopping Sight Distance​Go
fxHeight of Obstruction Given Angle Grades​Go
fxDriver Sight Height given Angle Grades​Go
fxLength of Summit Curve Given Angle Grades​Go
fxNegative Grade Angle Given Sight Distance​Go
fxPositive Grade Angle Given Sight Distance​Go

List of variables in Vertical alignment formulas

fx Length of Curve ​Go
fx Driver Sight Height ​Go
fx The Height of The Obstruction ​Go
fx Deviation Angle ​Go
fx Positive Grade Angle ​Go
fx Negative Grade Angle ​Go

FAQ

What is the Sight Distance?
Sight Distance 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. Sight Distance is usually measured using the Meter for Length. Note that the value of Sight Distance is always positive.
Can the Sight Distance be negative?
No, the Sight Distance, measured in Length cannot be negative.
What unit is used to measure Sight Distance?
Sight Distance is usually measured using the Meter[m] for Length. Millimeter[m], Kilometer[m], Decimeter[m] are the few other units in which Sight Distance can be measured.
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