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Class_11_Introduction_to_Geometric_Desig

# Class_11_Introduction_to_Geometric_Desig - The Pennsylvania...

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The Pennsylvania State University Department of Civil and Environmental Engineering CE 321: Highway Engineering Class #11: Introduction to Geometric Design Spring 2008

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Overview Geometric Design Policy Functional Classification Design Controls & Criteria Design Vehicles Driver Performance Traffic Characteristics
A Policy on Geometric Design of Highways and Streets, 2001 Published by: American Association of State Highway and Transportation Officials (AASHTO) Known as the “Green Book” Geometric Design Policy

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Functional Classification of Roadways Series of travel movements: Main movement (high-speed flow) Transition Distribution Collection Access Termination (parked vehicle) All six stages not necessary Maintain identifiable order
Hierarchy of Movement Source: A Policy on Geometric Design Of Highways and Streets, AASHTO, 2001.

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Functional Classification of Roadways Each hierarchy stage should intersect with facilities of the next higher or lower classification. Stages needed to satisfy spacing needs and traffic volume demands. Functional classification is grouping of highways and streets according to the service they are intended to provide.
Functional Classification of Roadways AASHTO’s criteria recognizes two functions provided by streets and highways: Mobility Access These two functions conflict.

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Functional Classification of Roadways AASHTO’s criteria recognizes two functions provided by streets and highways: Mobility - ability to move about an area, sometimes great distances Access - ability to reach locations to participate in activities at those locations These two functions conflict.
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