Class_14_Horizontal_Alignment_II - The Pennsylvania State...

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Unformatted text preview: The Pennsylvania State University Department of Civil and Environmental Engineering CE 321: Highway Engineering Class #14 Horizontal Alignment (Part 2) Spring 2008 Horizontal Sight Distance Horizontal Sight Distance Stopping Sight Distance Considerations for Horizontal Curves Source: Figure 3.14 from MKW Stopping Sight Distance for Horizontal Curves s v R SSD = 180 R v = radius to vehicles 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 ) ( 180 = Stopping Sight Distance for Horizontal Curves M s = R v 1 - cos 90 (SSD) R v SSD = R v 90 cos-1 R v- M s R v R v = radius to vehicles 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) R v SSD = R v 90 cos-1 R v- M s R v R v = radius to vehicles traveled path (radius to the middle of the innermost lane)...
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This note was uploaded on 06/08/2009 for the course CE 321 taught by Professor Petrucha during the Spring '02 term at Pennsylvania State University, University Park.

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Class_14_Horizontal_Alignment_II - The Pennsylvania State...

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