MedianDepressedShoulderVert

This subassembly creates a cross-sectional representation of a depressed median with inside shoulders, using vertical termination of shoulder subbase.

It supports superelevation pivoting about the attachment point at the centerline, or about the attachment point elevation at the inside edges-of-traveled-way. The pavement structure on the paved portions of the shoulder follows the standards described in "Pavement Structure of Paved Sections" in the Autodesk Civil 3D Help.

Table of Widths		Table of Slopes
W1	Ditch	S1	Ditch of Foreslope
W2	Left Median	S2	Unpaved Shoulder Slope
W3	Right Median	S3	Left Inside Superelevation
W4	Paved Shoulder	S4	Right Inside Superelevation Shoulder Slope
W5	Unpaved Shoulder	S5	Left Outside Lane Slope
W6	Left Turn Lane	S6	Right Outside Lane Slope
W7	Right Turn Lane

Attachment

The attachment point is above the centerline of the ditch. The location of the median links relative to the attachment point varies depending on the pivot method, and in some cases, the median widths and lane slopes. The attachment point is typically placed on the baseline alignment at the design profile elevation.

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
Ditch Width	Width of the bottom of the median ditch (zero for a V-ditch	Numeric, positive	0.6 m 2 ft
Ditch Slope	Inward slope from the shoulders toward the bottom of ditch (x : 1)	Numeric, positive	4 : 1
Hold Ditch Slopes	For the cases where the top-of-ditch-slope points are at unequal elevations, selects whether to hold the ditch sideslopes and let the position of the ditch shift, or to hold the ditch at the center and adjust the sideslope on the high side.	Selection list	Hold ditch sideslopes, shift ditch from center
Centerline Pivot?	Select whether the profile grade and pivot point is at the centerline above the median ditch, or if it is held at the inside edges-of-traveled-ways	Selection list	Pivot about inside edge-of-travelled way
Shoulder Slope Direction	Specifies whether the shoulder slopes away from the crown or towards the crown	Selection List: Away from Crown Towards Crown	Away from Crown
Left Median Width	Width from the median centerline to the left inside edge-of-traveled-way	Numeric, positive	6.6 m 22 ft
Right Median Width	Width from the median centerline to the right inside edge-of-traveled-way	Numeric, positive	6.6 m 22 ft
Paved Shoulder Width	Width of the paved portion of the inside shoulder	Numeric, positive	0.6 m 2.0 ft
Unpaved Shoulder Width	Width of the unpaved portion of the inside shoulder	Numeric, positive	1.2 m 4.0 ft
Unpaved Shoulder %Slope	% slope of the unpaved portion of the inside shoulder	Numeric	-6 (%)
Pave1 Depth	Depth between the finish grade and Pave1 surface	Numeric, positive	0.025 m 0.083 ft
Pave2 Depth	Depth between the Pave1 and Pave2 surfaces	Numeric, positive	0.025 m 0.083 ft
Base Depth	Depth between the Pave2 and Base surfaces	Numeric, positive	0.100 m 0.333 ft
Subbase Depth	Depth between the paved shoulders’ finish grade and subbase surfaces	Numeric, positive	0.3 m 1 ft
Left Turn Lane Width	Width of the optional turning lane on the left side	Numeric, positive	0
Right Turn Lane Width	Width of the optional turning lane on the right side	Numeric, positive	0

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
Ditch Slope	May be used to override the Ditch Slope and tie the median bottom-of-ditch to a profile. The following object types can be used as targets for specifying this: profiles, 3D polylines, feature lines, or survey figures.	Optional
Left Median Width	May be used to override the fixed Left Median Width and tie the left inside edge-of-traveled-way 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
Right Median Width	May be used to override the fixed Right Median Width and tie the right inside edge-of-traveled-way 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
Superelevation Axis of Rotation	Indicates whether the subassembly supports the axis of rotation calculation. To view a description of the parameter, in the Properties window, hover the cursor over the parameter. For more information, see Profile Grade Line Adjustments During Superelevation.	Static (Description)

Behavior

This subassembly cannot be inserted separately for the left and right sides. It builds the median to both sides of the attachment point.

Superelevation Pivot Point

The median can be configured to have the superelevation pivot point at the centerline, or at the inside edges of traveled ways. If Centerline Pivot is used, the left and right outside lane superelevation slopes are obtained from the baseline’s superelevation specifications, and the elevations of the inside edges-of-traveled-ways are calculated by applying these slopes to the left and right median widths from the attachment point. If Centerline Pivot is not used, the edges-of-traveled-ways are held to the elevation of the attachment point.

Ditch Elevations and Slopes

Superelevation or turning lanes may cause the top of the ditch slopes to be at different elevations on the left and right sides, resulting in an asymetrical ditch. There are two options for handling this situation. If Hold Ditch Slopes is set to True, then the given ditch slopes are held constant on both sides, which shifts the bottom of ditch away from the centerline towards the lower side. If set to False, the ditch bottom is centered about the median centerline, the given slope is held on the lower side, and the slope is adjusted to match on the higher side.

Shoulder Treatment

The paved portions of the shoulders follow the slopes defined for the left and right inside shoulder slopes for the baseline alignment’s superelevation specifications. These slopes are applied inward from the inside edges of traveled ways. The unpaved portions of the shoulders are fixed at the given Unpaved Shoulder %Slope value.

Superelevation Axis of Rotation Support

This subassembly works only with Roadway Types that have a Pivot Method of Median Edges and a Median Treatment of Maintain Median Shape. If you use this subassembly with any other Pivot Method or with Distorted Median Treatment, it will produce a result equivalent to Median Edges with Maintain Median Shape.

Layout Mode Operation

In layout mode, this subassembly calculates and displays the median and shoulders based on the input parameters given, and assuming that the lane slopes are -2% and the paved shoulder slopes are -5%.

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
P2, P7	EPS	Edges of paved shoulder on finish grade
P10, P17	EPS_Pave1	Edges of paved shoulder on Pave1
P12, P19	EPS_Pave2	Edges of paved shoulder on Pave2
P14, P21	EPS_Base	Edges of paved shoulder on Base
P16, P23	EPS_Sub	Edges of paved shoulder on Subbase
P3, P6	ES_Unpaved	Edges of gravel shoulder
P4	LMedDitch	Left edge of median ditch
P5	RMedDitch	Right edge of median ditch
L1, L7	Top Pave	Finish grade on paved shoulders
L2 – L6	Top Datum	Finish grade on unpaved shoulder and median links
L8, L12	Pave1
L9, L13	Pave2
L10, L14	Base
L11, L15	SubBase
L11, L15, L16, L17	Datum	Subbase and vertical links on paved shoulders
S1, S5	Pave1
S2, S6	Pave2
S3, S7	Base
S4, S8	SubBase

Coding Diagram