OverlayWidenMatchSlope1

Attachment

The attachment point is at the inside edge of the top of the overlay layer.

Input Parameters

Note: All dimensions are in meters or feet unless otherwise noted. All slopes are in run-over-rise form (for example, 4 : 1) unless indicated as a percent slope with a “%” sign.

Parameter	Description	Type	Default
Sample Point Offset	Offset of the sample point, which may be anywhere between the insertion point and the next slope break on the existing road surface. Typical Sample point locations are the crown of road, or the opposite edge-of-traveled-way if the road is not crowned.	Numeric	0.0
Insert Point Offset	Offset of the insertion point, which is typically at the edge-of-traveled-way where the widening is to occur	Numeric	0.0
Overlay Depth	Depth of the overlay above the existing finish grade	Numeric, positive	0.100 m 0.30 ft
Width	Width of the widening lane	Numeric, positive	3.6 m 12.0 ft
Pave1 Depth	Thickness of the Pave1 layer for the lane widening; zero to omit	Numeric, positive	0.025 m 0.083 ft
Pave2 Depth	Thickness of the Pave2 layer for the lane widening; zero to omit	Numeric, positive	0.025 m 0.083 ft
Base Depth	Thickness of the base layer for the lane widening	Numeric, positive	0.100 m 0.333 ft
Subbase Depth	Thickness of the subbase layer for the lane widening	Numeric, positive	0.300 m 1.0 ft

Target Parameters

This section lists the parameters in this subassembly that can be mapped to one or more target objects, such as a surface, alignment, or profile object in a drawing. For more information, see To Specify Corridor Targets.

Parameter	Description	Status
Existing Surface	Name of the Surface defining the existing roadway. The following object types can be used as targets for specifying this surface: surfaces.	Required
Sample Point Offset	May be used to override the fixed Sample Point Offset and tie the point to an offset alignment. The following object types can be used as targets for specifying this offset: alignments, polylines, feature lines, or survey figures.	Optional
Insert Point Offset	May be used to override the fixed Insert Point Offset and tie the point to an offset alignment. The following object types can be used as targets for specifying this offset: alignments, polylines, feature lines, or survey figures.	Optional
Width	May be used to override the fixed widening lane Width and tie the edge-of-lane to an offset alignment. The following object types can be used as targets for specifying this offset: alignments, polylines, feature lines, or survey figures.	Optional

Output Parameters

Parameter	Description	Type
%Slope	The calculated slope on the existing surface from the Sample Point to the Insert Point	Numeric

Behavior

The elevations of the Sample Point and Insert Point on the Existing Surface are determined, and the slope is calculated from the sample point to the insert point. An overlay layer is added above the existing lane at the same slope for the given Overlay Depth. A closed overlay shape is created by superimposing one or more links over the existing grade.The widening lane is attached outward from the overlay at the Insert Offset using the calculated slope.

The pavement layers are closed with vertical links at each end. A single verttical link is also placed from the inside edge of Subbase to the existing surface.

Layout Mode Operation

In layout mode, this subassembly is attached to any convenient point. The overlay layer is shown at a uniform depth for a width of 3.6 meters or 12 ft at a slope of -2%. The widening lane extends from the edge-of-overlay for the given width and depths at a -2% slope.

In modeling mode the shapes adjust to the actual conditions determined by the Sample Point, Insert Point, and Existing Surface.

Point, Link, and Shape Codes

The following table lists the point, link, and shape codes for this subassembly that have codes assigned to them. Point, link, or shape codes for this subassembly that do not have codes assigned are not included in this table.

Point, Link, or Shape	Code	Description
P5	ETW	Outside edge of widening lane on finish grade
P7	ETW_Pave1	Outside edge of widening lane on Pave1
P9	ETW_Pave2	Outside edge of widening lane on Pave2
P11	ETW_Base	Outside edge of widening lane on Base
P13	ETW_Sub	Outside edge of widening lane on Subbase
L1, L5	Top, Pave	Finish grade surface
L2	Overlay	Superimposed over links on the Existing Surface. Note that there may be more than a single link between points P3 and P4.
L6	Pave1
L7	Pave2
L8	Base
L9	SubBase, Datum
L10	Datum
S1	Overlay	Area between the overlay and existing lane
S2	Pave1
S3	Pave2
S4	Base
S5	SubBase