Chapter 3 _3_

Chapter 3 _3_ - Geometric Design: Horizontal Alignment...

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Unformatted text preview: Geometric Design: Horizontal Alignment Specifying the directional transition of the roadway in a horizontal plane considering the cornering capabilities of a variety of vehicles. ECI 161 Winter 2012 2 Outline Horizontal Alignment s Concepts s Vehicle Cornering s Horizontal Curve Design Factors ECI 161 Winter 2012 3 Horizontal Alignment ECI 161 Winter 2012 4 Horizontal Alignment h Directional transition in a horizontal plane h What are the key concerns? s Cornering capabilities of a variety of vehicles s Adequate drainage ECI 161 Winter 2012 5 Horizontal Alignment Which type of curves do we use for horizontal alignment? Circle Spiral Combination of both ECI 161 Winter 2012 6 Stationing in Horizontal Curves PC: point of curve PT: point of tangent PI: point of tangent intersection R: radius, measured from center line of the road, ft T: tangent length, ft L: length of curve, ft E: external distance, ft M: middle ordinate, ft Stationing: from centerline of the Road...
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This note was uploaded on 03/10/2012 for the course ECI 161 taught by Professor Tafazzoli during the Winter '12 term at UC Davis.

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Chapter 3 _3_ - Geometric Design: Horizontal Alignment...

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