LnExtendBase

Generic lane subassembly with one pavement layer, up to three base layers, and one subgrade improvement layer. Slope of pavement and subgrade can be independently fixed or controlled by superelevation.   Base layer slopes can be oriented parallel to Top or Datum. The base layers can be extended beyond the pavement limits for use with curb and gutter.  Divided highway support is provided by utilizing opposite side superelevation values multiplied by -1. This subassembly also includes a zero pavement width option for creating a single set of break lines along a baseline or modeling curb and gutter without lanes.

This subassembly is designed to accommodate modeling roadway lanes per WisDOT standards. All lane insertions allow the user to specify the use of the Insertion side Outside lane, Inside lane, Outside shoulder, or Inside shoulder superelevation slope as obtained from the superelevation specifications for the baseline alignment, or the use of the Outside lane, Inside lane, Outside shoulder, or Inside shoulder superelevation slope defined for the opposite side, which is then multiplied by -1.

The opposite side Outside/Inside lane/shoulder superelevation slope is used when creating assemblies for divided highways. On divided highways, the superelevation rotation point is defined at the inside edge of pavement. In normal crown the slope of the inside lane is upward at a 2% slope (+2%) which is achieved by using the Opposite side outside lane multiplied by –1. The outside lane would use the insertion side Outside lane SE slope to create a lane which slopes downward at 2%, thereby creating a roadway section that appears to rotate about the centerline in normal crown.

Starting at the attachment point, a finished pavement surface and subsequent base course surfaces are inserted using the given width, depth and slopes. Vertical links close the shape at either end of the lane.

There are two options for targeting a profile for the lane slope and elevation. The first option is to target a profile to set the elevation of the lane edge. The second option is to target a profile and interpret the profile elevation as a lane slope. The hierarchy for lane slope control is as follows: A profile target use to set lane slope supersedes any assigned superelevation or user-defined lane slope values. A profile target used to set lane elevation supersedes a profile target used to set lane slope and any assigned superelevation or user-defined lane slope values.

Alternatively, a marked point can be established in the same assembly group. Then, the subassembly can target the marked point to establish the outside lane elevation.

A targeted horizontal chain can be used to vary the width of the lane. Profiles can also be targeted to control the lane width and the inside/outside base extension widths. The profile elevation values are interpreted as width values. When targeted, these profile supersede horizontal targets for width.

The subgrade slope is controlled by the Subgrade SE Method parameter. If Subgrade superelevation method is set to Use outside lane SE, inside lane SE, outside shoulder SE, or inside shoulder SE, the slope of the subgrade is equal to insertion side outside lane, inside lane, outside shoulder, or inside shoulder superelevation slope for the defined baseline alignment. If Subgrade superelevation method is set to Use the opposite side outside lane SE x -1, Use the opposite side inside lane SE x -1, Use opposite outside lane SE x -1, Use opposite side outside shoulder SE x -1, or Use opposite side inside shoulder SE x -1, the slope of the subgrade is equal to the opposite of insertion side outside lane, inside lane, outside shoulder, or inside shoulder superelevation slope multiplied by -1 for the defined baseline alignment. If Subgrade superelevation method is set to Follow pavement, then the subgrade slope will always be equal to the slope of the pavement surface, even if a target elevation is used to define the outer edge of the top of the travel lane. User also has the option of specifying a User defined slope.

A target profile elevation can be interpreted as the subgrade slope. The targeted profile always supersedes any superelevation or user-defined subgrade slope value.

When the slope of the subgrade differs from the slope of the pavement surface, the user may use the Base layer slope orientation parameter to have all other base course layers follow the slope of the datum (subgrade) surface, or follow the slope of the top (pavement) surface.

The subassembly may be used with a curb and gutter subassembly (such as CGBasic or UrbanCurbGutterGeneral) by extending the base layers beyond the pavement limits using the Inside base extension width and Outside Base extension width parameters.  When these values are set to 0, the base width is equal to the pavement width.  These parameters are only available when the pavement thickness in uniform (Inside pavement thickness = Outside pavement thickness) and non-zero.

The subassembly also has a zero pavement width option used for creating a single set of break lines along a baseline or where curb and gutter is desired without a lane.  This is achieved by setting the Lane width parameter to 0.  Note that in order to utilize the extended base feature for the curb and gutter, the Inside pavement thickness and Outside pavement thickness must be equal and non-zero.

The attachment point is at the inside edge of lane on the finish grade surface. This component can be attached to either the left or right side.

In layout mode, this subassembly displays the links using the given width and depths. The subassembly will display the pavement slope at the value given for the Pavement slope parameter.  The subgrade slope will be displayed as the value given for the Subgrade slope parameter.

Info: All dimensions are in feet unless otherwise noted. All slopes are indicated as a percent slope with a "%" sign.

Parameter	Description	Type	Default
Side	Indicates which side the subassembly is inserted towards.	Left/Right	Right
Lane width	Width of the lane from the offset of the inside edge to the offset of the outside edge.	Numeric, positive	12.0
Marked point	Name of marked point used establish outside lane elevation	String	MarkePoint
Inside pavement thickness	Thickness of the inside edge of the pavement layer.	Numeric, positive	6 in.
Outside pavement thickness	Thickness of the outside edge of the pavement layer	Numeric, positive	6 in.
Base1 thickness	Thickness first base course layer.	Numeric, positive	12 in.
Base2 thickness	Thickness second base course layer.	Numeric, positive	0 in.
Subbase thickness	Thickness of subbase layer.	Numeric, positive	0 in.
Subgrade improvement thickness	Thickness of subgrade improvement layer.	Numeric, positive	0 in.
Superelevation type	Entry of Use outside lane SE results in the pavement slope being equal to insertion side outside lane superelevation Slope for the defined baseline alignment; Entry of Use inside lane SE results in the pavement slope being equal to insertion side inside lane superelevation Use outside shoulder SE results in the pavement slope being equal to insertion side outside shoulder superelevation slope for the defined baseline alignment; Entry of Use inside shoulder SE results in the pavement slope being equal to insertion side inside shoulder superelevation Slope for the defined baseline alignment; Use the opposite side outside lane SE x -1, which results in a pavement slope being equal to outside lane superelevation slope defined for the side opposite the insertion side multiplied by -1; Use the opposite side inside lane SE x -1, which results in a pavement slope being equal to inside lane superelevation slope defined for the side opposite the insertion side multiplied by -1; Use the opposite side outside shoulder SE x -1, which results in a pavement slope being equal to outside shoulder superelevation slope defined for the side opposite the insertion side multiplied by -1; Use the opposite side inside shoulder SE x -1, which results in a pavement slope being equal to inside shoulder superelevation slope defined for the side opposite the insertion side multiplied by -1; User defined results in the pavement slope following the Pavement slope parameter entry.	String, Combo List of options: User defined Use outside lane SE Use inside lane SE Use outside shoulder SE User inside shoulder SE Use opposite side outside lane SE x -1 Use opposite Side inside lane SE x -1 Use opposite side outside shoulder SE x-1 Use opposite side inside shoulder SE x -1	Use Outside Lane SE
Crown location	Specifies whether to code inside or outside edge of travelway as Crown.	String, Combo List of options: Inside Outside	Inside
Pavement slope	User defined slope of the lane, used when the superelevation slope of the alignment is not defined or User defined is selected for Superelevation Type.	Slope	-2%
Subgrade SE method	Specifies to the method used to determine the slope of the subgrade surface.	String, Combo List of options: User defined Use outside lane SE Use inside lane SE Use outside shoulder SE User inside shoulder SE Use opposite side outside lane SE x -1 Use opposite side inside lane SE x -1 Use opposite side outside shoulder SE x-1 Use opposite side inside shoulder SE x -1 Follow pavement	Follow Pavement
Subgrade slope	Default cross slope of the subgrade. This value is used if User defined is selected as the Subgrade SE Method or superelevation is not specified for the baseline alignment.	Slope	-2.0%
Base layer slope orientation	When multiple base layers exist, and entry of Parallel to top causes base layers to follow pavement (top) slope. Entry of Parallel to datum causes base layer to follow subgrade slope.	String, Combo List of options: Parallel to top Parallel to datum	Parallel to top
Inside base extension width	Width of base extension to the inside direction from the inside edge.	Numeric, positive	0.0'
Outside base extension width	Width of base extension to the outside direction from the outside edge.	Numeric, positive	5.0'
Include surface widening points		Yes/No	No

This section lists the parameters in this subassembly that can be mapped to a target object such as a surface, alignment, or profile object in a drawing. For more information, see Setting and Editing Targets in the AutoCAD Civil 3D User's Guide Help.

Parameter	Description	Status
Lane profile	May be used to override the normal lane slope and tie the outer edge of the travel lane to the elevation of an object. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures.	Optional
Lane slope from profile	May be used to override the normal lane slope by interpreting profile elevations as slope values. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures.	Optional
Lane width from profile	May be used to override the lane width by interpreting profile elevations as width values. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures.	Optional
Lane width	May be used to override the fixed lane width and tie the edge of a lane to an offset object. If insertion side is right, the object must be located to the right of the attachment point. If insertion side is left, the object must be located to the left of the attachment point. The following object types can be used as targets for specifying the width: alignments, polylines, feature lines, or survey features.	Optional
Subgrade slope from profile	May be used to override the normal subgrade slope by interpreting profile elevations as slope values. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures.	Optional
Inside base extension from profile	May be used to override the inside base extension width by interpreting profile elevations as width values. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures.	Optional
Outside base extension from profile	May be used to override the outside base extension width by interpreting profile elevations as width values. The following object types can be used as targets for specifying this elevation: profiles, 3D polylines, feature lines, or survey figures.	Optional
Inside base extension width	May be used to override the user defined base extension width on the inside. If insertion side is right, the object must be located to the left of the attachment point. If insertion side is left, the object must be located to the right of the attachment point. The following object types can be used as targets for specifying the width: alignments, polylines, feature lines, or survey features.	Optional
Outside base extension width	May be used to override the user defined base extension width on the inside. If insertion side is right, the object must be located to the right of the attachment point. If insertion side is left, the object must be located to the left of the attachment point. The following object types can be used as targets for specifying the width: alignments, polylines, feature lines, or survey features.	Optional
Surface for widening

Parameter	Description	Type
Pavement slope [Output]	Slope of the Pavement.	Slope
Subgrade slope [Output]	Slope of the Subgrade Surface.	Slope
Offset of edge of lane [Output]	Offset of edge of top of pavement	Numeric
Lane width [Output]	Width of lane	Numeric
Inside base extension width [Output]	Width of base extension on the inside	Numeric
Outside base extension width [Output]	Width of base extension on the outside	Numeric
Inside pavement thickness [Output]	Inside thickness of pavement	Numeric
Inside Base1 thickness [Output]	Base1 thickness at inside Edge computed by taking the difference between the elevation at Crown_Base1 (ETW_Base1 if Crown Location=Outside) and the point immediately above it.	Numeric
Inside Base2 thickness [Output]	Base2 thickness at inside Edge computed by taking the difference between the elevation at Crown_Base2 (ETW_Base2 if Crown Location=Outside) and the point immediately above it.	Numeric
Inside Subbase thickness [Output]	Subbase Thickness at inside Edge computed by taking the difference between the elevation at Crown_Sub (ETW_Sub if Crown Location=Outside) and the point immediately above it	Numeric
Outside pavement thickness [Output]	Outside thickness of pavement	Numeric
Outside Base1 thickness [Output]	Base1 thickness at outer Edge computed by taking the difference between the elevation at ETW_Base1 (Crown_Base1 if Crown Location=Outside) and the point immediately above it.	Numeric
Outside Base2 thickness [Output]	Base2 thickness at outer Edge computed by taking the difference between the elevation at ETW_Base2 (Crown_Base2 if Crown Location=Outside) and the point immediately above it.	Numeric
Outside Subbase thickness [Output]	Subbase Thickness at outer Edge computed by taking the difference between the elevation at ETW_Sub (Crown_Sub if Crown Location=Outside) and the point immediately above it	Numeric
Outside subgrade depth [Output]	Depth to Subgrade Surface at outer Edge computed by taking the difference between the elevation at ETW and ETW_Sub	Numeric

Point/Link/Shape	Codes	Description
P1	Crown ETW	Crown point or edge of lane point on finish grade
P2	ETW Crown	Edge of lane point or crown point on finish grade
P3	Crown_Pave1 ETW_Pave1	Crown point or edge of lane point at bottom of pavement layer (optional)
P4	ETW_Pave1 Crown_Pave1	Edge of lane or crown point at bottom of pavement layer (optional)
P5	Crown_Base1 ETW_Base1	Crown point or edge of lane point at bottom of Base1 layer (optional)
P6	ETW_Base1 Crown_Base1	Outside edge of lane point or crown point at bottom of Base1 layer (optional)
P7	Crown_Base2 ETW_Base2	Crown point or edge of lane point at bottom of Base2 layer (optional)
P8	ETW_Base2 Crown_Base2	Edge of lane point or crown point at bottom of Base2 layer (optional)
P9	Crown_Sub ETW_Sub	Crown point or edge of lane point on subgrade
P10	ETW_Sub Crown_Sub	Edge of lane point or crown point on subgrade
P11	Crown_SGImp ETW_SGImp	Crown point or edge of lane point on bottom of subgrade improvement (optional)
P12	ETW_SGImp Crown_SGImp	Edge of lane point or crown point on bottom of subgrade improvement (optional)
P13	Crown_Pave1_CG ETW_Pave1_CG	Top of first extended base layer on crown side or edge of lane side (optional)
P14	ETW_Pave1_CG Crown_Pave1_CG	Top of first extended base layer on edge of lane side or crown side (optional)
P15	Crown_Base1_CG ETW_Base1_CG	Bottom of extended Base1 layer on crown side or edge of lane side (optional)
P16	ETW_Base1_CG	Bottom of extended Base1 layer on edge or lane side or crown side (optional)
P17	Crown_Base2_CG ETW_Base2_CG	Bottom of extended Base2 layer on crown side or edge of lane side (optional)
P18	ETW_Base2_CG Crown_Base2_CG	Bottom of extended Base2 layer on edge or lane side or crown side (optional)
P19	Crown_Sub_CG ETW_Sub_CG	Extended subgrade point on Crown side or edge of lane side
P20	ETW_Sub_CG Crown_Sub_CG	Extended subgrade point on edge of lane side or crown side
P21	Crown_SGImp_CG ETW_SGImp_CG	Bottom of extended Subgrade Improvement layer on crown side or edge of lane side (optional)
P22	ETW_SGImp_CG Crown_SGImp_CG	Bottom of extended Subgrade Improvement layer on edge or lane side or crown side (optional)
L1	Top,LABELPCT,PaveLn1	Finish grade
L2, L17, L18	Pave1	Bottom of pavement/top of base (optional)
L3	Base1	Bottom of first Base (optional)
L4	Base2	Bottom of second Base (optional)
L5	Datum	Subgrade
L6	SGImp	Bottom of subgrade improvement (optional)
L7, L8	Pave_Edge	Edge of pavement (optional)
L9, L11, L13, L15	BaseEdge_In	Inside edge of base layers (optional)
L10, L13, L14, L16	BaseEdge_Out	Outside edge of base layers (optional)
S1	Pave1	Pavement shape (optional)
S2	Base1	First base layer shape (optional)
S3	Base2	Second base layer shape (optional)
S4	Subbase	Subbase layer shape (optional)
S5	SG_Imp	Subgrade improvement shape (optional)