BasicLaneTransition

This subassembly creates a simple lane with finish surface and subbase, where the edge of carriageway can be tied to an alignment or profile.

This subassembly is one of a group of Getting Started subassemblies used for simple carriageway modeling, and for tutorial and training purposes.

Attachment

The attachment point is either (a) at the inside edge of lane on finished gradient, if the insertion point is Crown, or (b) at the outside edge of travel way, if the insertion point is at the edge of travel way.

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
Side	Specifies which side to place the subassembly	Left / Right	Right
Insertion Point	Specifies insertion point of the lane either at the crown, or at the edge of travel way	List of options: Crown, Edge of Travel Way	Crown
Crown Point on Inside	Specifies that the inside edge of travel way be coded as Crown	Yes / No	Yes
Width	Width of lane	Numeric, positive	3.6 m 12.0 ft
Depth	Depth from finish surface to subbase	Numeric, positive	0.2 m 0.67 ft
%Slope	% Slope of the lane	Numeric	-2%
Transition	Describes how the subassembly behaves when an alignment, profile, or both are used as target parameters. Choices are provided in a list including: Hold offset and level Hold level, change offset Hold gradient, change offset Hold offset, change level Change offset and level	Menu	Hold offset and level

Target Parameters

This section lists the parameters in this subassembly that can be mapped to one or more target objects. For more information, see in the AutoCAD Civil 3D User’s Guide Help.

Parameter	Description	Status
Edge Offset	May be used to override the fixed Width value and tie the edge of carriageway to an offset. The following object types can be used as targets for specifying the offset: alignments, polylines, feature lines, or survey figures.	Optional
Edge Level	May be used to override the fixed slope and tie the edge of carriageway to a level. The following object types can be used as targets for specifying the level: profiles, 3D polylines, feature lines, or survey figures.	Optional

Output Parameters

None.

Behavior

This subassembly provides a simple travel lane that can tie to an alignment for variable width, and a profile for variable slope. The behavior depends on the Transition type selected:

Transition Type	Description
Hold offset and level	The width and slope of the lane is held to the Width and % Slope input parameter values.
Hold level, change offset	The level of the edge of carriageway is calculated from the Width and % slope input parameter values. The width is then tied to the offset alignment.
Hold gradient, change offset	The width is adjusted to tie to the offset alignment. The % Slope input value is held for the adjusted width.
Hold offset, change level	The width is held to the Width input parameter value. The level of the edge of carriageway is tied to the offset profile.
Change offset and level	The width is tied to the offset alignment, and the slope is adjusted to tie the level of the edge of carriageway to the offset profile.

Layout Mode Operation

In layout mode, this subassembly draws the lane using the input parameters.

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	Codes	Description
P1	Crown	Crown of road on finish surface
P2	EC	Edge of carriageway on finish surface
P3	Crown_Subbase	Crown of road on subbase
P4	EC_Subbase	Edge of carriageway on subbase
L1	Top, Pave	Paved finish surface
L3	Datum, SubBase	Subbase
S1	Pave1