Lecture 12

# Lecture 12 - The Pennsylvania State University Department...

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Lecture 12 – Vertical Curvature (Part 2) CE 321: Highway Engineering Fall 2007 The Pennsylvania State University Department of Civil and Environmental Engineering

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Sag Curve Design and Stopping Sight Distance H = height of headlight (ft) β = inclined angle of headlight beam (degrees) L = length of vertical curve (ft) S = sight distance (ft)
Sag Curve Design Sight Distance greater than length of vertical curve: ( S > L ) ( 29 A tan S H 200 2 β + - = S L m Headlight distance is the critical length L m = Minimum length of vertical curve (ft) S = Sight Distance (ft) β = the incline angle of the headlight beam relative to the horizontal plane of the car H = Height of headlight above the roadway (ft) A = Algebraic difference in grades (%)

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( 29 β tan S H 200 2 + = AS L m Sag Curve Design Sight Distance less than length of vertical curve: ( S < L ) Headlight distance is the critical length L m = Minimum length of vertical curve (m) S = Sight Distance (m) β = the incline angle of the headlight beam relative to the horizontal plane of the car H = Height of headlight above the roadway (m) A = Algebraic difference in grades (%)
L m = Minimum length of vertical curve (ft) SSD = Stopping-Sight Distance (ft) - controlled by headlights

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Lecture 12 - The Pennsylvania State University Department...

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