Superelevation

1
Superelevation
2
Shaping

• Shaping is the process of placing complex shapes
  into a design file to represent an area of
  pavement slope.
• Shapes can be either non-transitional or
  transitional.
• Non-transitional shapes have a constant slope the
  entire length of the shape.
• Transitional shapes have a different slope at
  each end of the shape, and GEOPAK will linearly
  or parabolically interpolate between.
  Transitional types would be used for
  super-elevation transition areas.

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Pavement Shapes
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Shape Clusters

• Every shape has four attributes,depending upon
  how you want to define your Profile Grade Line.
• Baseline
• Profile
• Tie
• PGL-Chain (Optional)

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Shape Clusters

• Every shape has four attributes,depending upon
  how you want to define your Profile Grade Line.
• Baseline
• Profile
• Tie
• PGL-Chain (Optional)
• A group of shapes that have the same attributes
  is referred to as a Shape Cluster.

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Pavement Shapes
baseline Route50
profile Route50pr
tie -30
tie 30
profile Route50pr
baseline Route50
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Dependent and Independent Shapes

• There are two types of shapes, DEPENDENT and
  INDEPENDENT, which refer to how elevations on the
  pavement surfaces are calculated.
• Elevations on pavement surfaces represented by
  DEPENDENT shapes are determined directly from the
  profile.
• Elevations on pavement surfaces represented by
  INDEPENDENT shapes do not rely on the proposed
  profile, but are connected to the adjacent shape.

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Dependent and Independent Shapes
C
-3.0
(INDEPENDENT)
-3.0
B
-2.0
(DEPENDENT)
-2.0
A
575
PGL
PGL
2.0
A
3.0
B
C
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Dependent and Independent Shapes
C
-3.0
-3.0
(DEPENDENT)
B
(INDEPENDENT)
-2.0
-2.0
A
575
PGL
PGL
3.0
A
3.0
2.0
B
C
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Dependent and Independent Shapes

• A GOOD RULE OF THUMB
• ONE DEPENDENT SHAPE FOR
• EACH SHAPE CLUSTER.

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Longitudinal Edges and Filler Lines

• Since shapes are standard MicroStation complex
  shapes, they consist of a series of connected
  elements that form a closed surface. These
  element can be classified into two types
• Longitudinal Edges
• Typically, these consist of the roadway edges of
  pavement or lane lines. These line do not
  represent slopes.
• Filler Lines
• These lines represent the beginning and ending
  slopes of a pavement shape. Each of these lines
  always represent a slope value.

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Longitudinal Edges and Filler Lines
x
x