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Chapter 3 _1_

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Geometric Design: Introduction + Vertical Curve Design Highway geometric design specifies details of component elements for safe and efficient operations and environmental aesthetics

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ECI 161 Winter 2012 2 Geometric Design of Highways Source: http://www.tfhrc.gov/pubrds/jan00/along.htm
ECI 161 Winter 2012 3 Factors Affecting Geometric Design s Design Speed s Highway Capacity s Design Designation s Control of Access s Pedestrian Facilities s Roadside Installations s Environmental Protection

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ECI 161 Winter 2012 4 s Alignment is a 3D problem broken down into two 2D problems s Horizontal Alignment (plan view) s Vertical Alignment (profile view) s Stationing s Along horizontal alignment s Measured along the centerline s Each station: 100ft (or 1000m for metric) Piilani Highway on Maui Geometric Design: 3D ->2D
ECI 161 Winter 2012 5 Horizontal Alignment Vertical Alignment Plan View and Profile View

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ECI 161 Winter 2012 6 Old Fashioned Drafting
ECI 161 Winter 2012 7 Route Numbering Convention s Interstate routes s One or two digits s Even number: 10, 40, 80 s Odd number: 5, 15, 35, 95 s Local routes (rules vary) 580, 880, 280, 680? 101?

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ECI 161 Winter 2012 8 Route Numbering Convention
Vertical Alignment Specifying the elevation of points along a roadway through crest curves and sag curves

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ECI 161 Winter 2012 10 Outline h Vertical Alignment s Parabolic (equal tangent) curve s Crest Vertical Curve Design s Sag Vertical Curve Design s Underpass Vertical Curve Design
ECI 161 Winter 2012 11 Concepts G 1 -G 2 PVI PVT

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