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Route_alignment_new

# Route_alignment_new - 7.1 Introduction CHAPTER 7...

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7.1 Introduction 7-2 Figure 7.1 De fi nition of Vertical Pro fi les (Plus Grade and Minus Grade ). Grades are expressed in [%] or in [m/m]. Horizontal alignment represents projection of the alignment onto xy plane (Figure 7.2). Figure 7.2 Horizontal Alignment. The position of a specific point on a highway is traditionally determined using concept of stations . A datum point on a highway alignment is specified. This initial point is designated station 0 + 000.000. The positions of all other points on the highway are calculated by measuring corresponding distances on a horizontal plane along the highway from the initial point. Each station contains one kilometer of highway alignment distance. For example, the point on a highway located 2345.6 m from the previously specified point, is designated station 2 + 345.600. The station 3 + 465.800 corresponds to the highway point located 3465.8 meters from the initial point. + - G 2 G 1 Tangent Tangent Curve Curve G 1 G 2 x y z (0,0,0) Horizontal alignment L L xy
7.2 Vertical Alignment 7-3 Let us create along horizontal alignment the surface orthogonal to the plane. Let us also denote the distance measured along the horizontal alignment . When we stretch this surface, it becomes flat. We call it plane. The vertical alignment represents the projection of the alignment onto plane (Figure 7.3).

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