OverlayWidenMatchSlope1
 
 
 

This subassembly overlays one side of an existing road, and adds one or more travel lanes to the edge while matching the existing lane slopes.

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 in the AutoCAD Civil 3D User’s Guide Help.

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

 

Coding Diagram