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Class_14_Horizontal_Alignment_II

# Class_14_Horizontal_Alignment_II - The Pennsylvania State...

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The Pennsylvania State University Department of Civil and Environmental Engineering CE 321: Highway Engineering Class #14 – Horizontal Alignment (Part 2) Spring 2008

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Horizontal Sight Distance
Horizontal Sight Distance

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Stopping Sight Distance Considerations for Horizontal Curves Source: Figure 3.14 from MKW
Stopping Sight Distance for Horizontal Curves s v R SSD = 180 π R v = radius to vehicle’s traveled path (radius to the middle of the innermost lane) s = the angle subtended by an arc equal to the SSD distance v R SSD s π ) ( 180 =

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Stopping Sight Distance for Horizontal Curves M s = R v 1 - cos 90 (SSD) π R v SSD = π R v 90 cos -1 R v - M s R v R v = radius to vehicle’s traveled path (radius to the middle of the innermost lane) SSD = stopping sight distance (ft) M s = middle ordinate distance (ft)
Stopping Sight Distance for Horizontal Curves M s = R v 1 - cos 90 (SSD) π R v SSD = π R v 90 cos -1 R v - M s R v R v = radius to vehicle’s traveled path (radius to the middle of the innermost lane) SSD = stopping sight distance (ft) M s = middle ordinate distance (ft) M = R [ 1- cos Δ/2] 3.38

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Class_14_Horizontal_Alignment_II - The Pennsylvania State...

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