Class_22_Cross_Sections - The Pennsylvania State University...

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Unformatted text preview: The Pennsylvania State University Department of Civil and Environmental Engineering CE 321: Highway Engineering Class #22 – Cross Sections Spring 2008 Overview Roadway cross-section elements Roadside cross-section elements Cross-section examples Guardrail crash test video Cross Section Elements (Rural Highways and Freeways) Multi-Lane Cross Section Two Lane Rural Cross Section Two lane Urban Cross Section Vertical Curb w/ Gutter Sloping Curb Roadway Cross Section Pavement Surfaces – High Type » Designed using AASHTO design of Rigid or Flexible Pavements. » Interstates and Primary facilities. » Highest traffic volumes and speeds. » Retain shape, proper cross-slope. » Typically smooth. Roadway Cross Section Pavement Surfaces – Low Type » Surface Treatments. » Local Roads. » Lowest traffic volumes and speeds. » Tend to ravel and reduce effective width. » Requires greater steering effort. Roadway Cross Section Lane Width – Between 9 and 12-feet wide. » Low-speed, low-volume = 9-feet » High-speed, high-volume = 12-feet – Consider truck use. – Consider rural vs. urban setting. Roadway Cross Section Normal Cross Slope – High Type -- 1.5 to 2 % – Low Type -- 2.0 to 6.0 % – Benefit of cross-slope is improved drainage....
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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_22_Cross_Sections - The Pennsylvania State University...

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