OverlayWidenWithSuper1
 
 
 

This subassembly overlays one side of an existing road, and adds one or more travel lanes to the edge using the superelevation slope defined for the outside travel lane.

Attachment

The attachment point is at the inside edge of the top of the overlay layer if the Overlay Depth is non-zero, or at the inside edge on finish grade of the widening lane if the Overlay Depth is zero.

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

Control Point Offset

Offset of the control point, which defines the beginning of the pavement overlay layer

Numeric

0.0

Insert Point Offset

Offset of the insertion point of the widening lane, which is typically at the existing edge-of-traveled-way. Specifying a positive value for the this parameter inserts this subassembly on the right side of a corridor, or controlling baseline. A negative value inserts it on the left side. For more information, see "Inserting Subassemblies on Right and Left Sides of a Corridor" in the Corridors chapter of the AutoCAD Civil 3D User's Guide Help.

Numeric

0.0

Overlay Depth

Depth of the overlay above the existing finish grade at the control point.

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

Control Point Offset

May be used to override the fixed Control 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 outside lane superelevation is obtained from the alignment properties of the current control alignment, and the elevation on the Existing Surface at the Control Point Offset is determined.

If a non-zero Overlay Depth is given, the overlay depth is applied at the control point. The top of the overlay layer extends to the Insert Point Offset at the superelevation slope, and the overlay shape is closed by superimposing links over the Existing Surface between the control and insert points and adding vertical links at each end. The widening lane is extended outward at the superelevation slope for the given Width from the edge of the overlay surface.

If the Overlay Depth is zero, the widening lane extends outward from the Insert Point Offset on the Existing Surface at the superelevation slope for the given Width.

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 may be attached to any convenient point. The overlay layer is shown at a uniform depth, with a width of 3.6 meters or 12 feet and extended at a slope of -2%. If the Overlay Depth is zero, the overlay is shown as a single link. The widening lane extends from the edge-of-overlay at a slope of -2%.

When used in corridor modeling mode, the shapes adjust to the selected control point, insert point, superelevation slope, 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