Sub-grade Width
The sub-grade width can either be entered explicitly or automatically
calculated from the surfacing material above. If the sub-grade is automatically
calculated from the surfacing (Auto size set) the sub-grade width
will vary with super-elevation.
Crown Slopes %
The crown slope applies when there is no super-elevation. When
super-elevation is present the crown slope is transitioned from full crown to
full super.
Sub-grade Daylight Distance
Daylighting can be used to automatically extend the sub-grade. This parameter
only applies if the edge of road is below topography (in cut). It the horizontal
distance from the edge of the sub-grade to ground is less than this parameter
the sub-grade is extended horizontally to meet ground.
Surfacing
Surfacing layers are defined from sub-grade upwards e.g. Layer 1 is the first
layer above sub-grade, layer 2 is the second layer above sub-grade and so on.
Depth –
Vertical thickness of road surfacing layers.
Fill Slope – Fill angle for layer.
Width – This is the horizontal distance from CL to the top edge of
surfacing (surfacing slope not included).
Auto Size
– if set, the the width of surfacing is determined from the layer above
(taking into account crown or super-elevation).
