OverlayMill1Lane1Side

This subassembly overlays one side of an existing road, with a milling layer added as required.

Attachment

The attachment point is the inside edge point of the overlay layer with finished gradient crossfall.

Input Parameters

Note: Note: All dimensions are in metres 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. User defined Right
Design Lane Width same as Existing Lane Width
  • Yes

    Specifies that the design lane width is the same as existing lane width.

  • No

    Specifies that the design lane width is not the same as existing lane width.

    Note: If No is selected, the Inside Edge of Existing Lane and Outside Edge of Existing Lane parameters will not be applied to the subassembly.
User defined No
Inside Edge of Existing Lane This is the start point for calculating existing ground slope. Numeric 0.000m
Outside Edge of Existing Lane This is the end point for calculating existing ground slope. Numeric 0.000m
Overlay Depth Depth of the overlay layer. Numeric 0.300m
Overlay Slope Options Specifies overlay slope options.
Tip: Flapping is a term used to describe how the Corrected Crossfall for an overlay in a rehab subassembly is calculated. Flapping outcomes are different, relative to the Slope Tolerance and the Slope Difference between existing ground crossfall and ideal crossfall. If the Slope Difference is less than the Slope Tolerance for the subassembly, then the use case is considered 'within tolerance'. If the Slope Difference is greater than the Slope Tolerance for the subassembly, then the use case is considered 'without tolerance'.
Note: Slope Tolerance is an absolute value. Therefore, for either a Slope Difference of 0.4% or -0.4%, both have an absolute value of 0.4%. If the Slope Tolerance is 0.5%, the 0.4% absolute Slope Difference would be considered within tolerance.
  • User Defined with Flapping
    Flapping specifies how the Corrected Crossfall will be calculated, relative to the slope tolerance for the subassembly
    • Flapping Within Tolerance:

      Corrected Crossfall will be set equal to Ideal Crossfall

    • Flapping Without Tolerance:

      Corrected Crossfall will be adjusted to match Existing Ground Slope within Slope Tolerance

  • User Defined Without Flapping
    Flapping will not be used to specify how the Corrected Crossfall will be calculated, relative to Slope Tolerance for the subassembly
    • Slope Difference Within Tolerance:

      Corrected Crossfall will be adjusted to match Existing Ground Slope, within Slope Tolerance

    • Slope Difference Without Tolerance:

      Corrected Crossfall will be adjusted to match the Ideal Crossfall, within slope tolerance

  • Outside/Inside Lane Superelevation
    Outside or Inside Lane Superelevation will replace Ideal Crossfall. Corrected Crossfall values for the overlay layer will be defined by the superelevation table for the section instead of the Ideal Crossfall.
    Note: If Outside/Inside Lane Superelevation is chosen but the alignment for the rehab corridor doesn't have a superelevation table defined, Ideal Crossfall will be used instead.
  • Match Slope

    The Corrected Crossfall is always set equal to Existing Ground Slope

  • Use Ideal Crossfall

    The Corrected Crossfall Slope is always set equal to Ideal Crossfall

User Defined User Defined Without Flapping
Ideal Crossfall Specifies user defined ideal crossfall. Numeric -2.00%
Lane Width The lane width, determined by the offset of the outside edge of lane from the inside edge of lane. Numeric 12.000m
Use Profile Options Select to tie the inside edge of overlay to a profile, adjust level to minimum level depth lock to preceding subassembly.
  • Minimum Level Depth

    The crossfall and level adjustments will meet Minimum Level and/or Minimum Mill Depth. The base is the existing surface.

  • Use Profile

    There will be no level adjustment. The level of the rehab subassembly attachment point will match the assigned profile. The crossfall adjustment will be determined by Overlay Slope Options.

  • Lock to Preceding

    There will be no level adjustment. The level of the rehab subassembly attachment point will match the attachment point of the preceding subassembly (in most cases this will be the preceding lane's end point). The crossfall adjustment will be determined by Overlay Slope Options.

User Defined Minimum Mill Depth
Minimum Mill Depth The minimum mill depth between the existing surface and bottom of the overlay layer. Numeric 0.300m
Slope Tolerance Tolerance for varying the overlay slope. Numeric 0.50%

Additional General Subassembly Parameter Reference

Flapping

Minimum Mill Depth

Inside Edge of Lane Offset

Output Parameters

Parameter Description Type Default
Corrected Crossfall This is the adjusted crossfall for the road, which has been optimised to match, as closely as possible, the rehab subassembly parameters you specified. Numeric -2.00%
Existing Ground Slope The crossfall (%) of the existing ground profile, calculated from the inside edge of the lane to the outside edge of the lane. Numeric n/a

Target Parameters

Parameter Description Required?
Target Surface Name of the surface defining the existing carriageway Yes
Crown Offset Target Name of the object defining the offset of the crown point. The following object types can be used as targets for specifying this offset: alignments, polylines, feature lines or survey figures. No
Inside Edge of Lane Offset Target Name of the object defining the offset of the inside edge of lane. The following object types can be used as targets for specifying this offset: alignments, polylines, feature lines or survey figures. No
Lane Width Target Name of the object defining the offset of the outside edge of lane. The following object types can be used as targets for specifying this offset: alignments, polylines, feature lines or survey figures. No
Inside Edge of Existing Lane Offset Target Name of the object defining the inside sample point offset will be used to calculate the existing surface slope. The following object types can be used as targets for specifying this offset: alignments, polylines, feature lines or survey figures. No
Outside Edge of Existing Lane Offset Target Name of the object defining the outside sample point offset will be used to calculate the existing surface slope. The following object types can be used as targets for specifying this offset: alignments, polylines, feature lines or survey figures. No

Behaviour

This subassembly assumes that no levelling layer is added. Flapping is within tolerance to meet no level and minimum mill. You can adjust level if needed to meet the no level and minimum mill. Procedurally, flapping should always be applied first, followed by vertical adjustment of the overlay layer if needed.
Note: It's not supported to adjust the corrected crossfall after vertical adjustments are performed on the overlay layer.
Case 1
Inputs:
Inputs
Ideal Crossfall -2.0%
Minimum Mill Depth 0
Slope Tolerance 0.50%
Overlay Slope Options User Defined with Flapping
Use Profile Options Minimum Mill Depth
Calculations:
Input Value
Existing Ground Crossfall -3.0%
Existing Ground Crossfall – Ideal Crossfall -1%
Slope Tolerance Existing Ground Slope minus Ideal Crossfall is -1%, which is greater than the 0.5% Slope Tolerance
Corrected Crossfall Corrected Crossfall will be set between -1.5% and -2.5% crossfall
Adjust level true
Output Value
Corrected Crossfall -2.5%
Case 2
Inputs:
Inputs
Ideal Crossfall -2.0%
Minimum Mill Depth 0
Slope Tolerance 0.50%
Overlay Slope Options User Defined with Flapping
Use Profile Options Minimum Mill Depth
Calculations:
Input Value
Existing Ground Crossfall -2.4%
Existing Ground Crossfall – Ideal Crossfall -0.4%
Slope Tolerance Existing Ground Slope minus Ideal Crossfall is -0.4%, which is less than the 0.5% Slope Tolerance
Corrected Crossfall Corrected Crossfall will be set between -1.5% and -2.5% crossfall
Adjust level true
Output Value
Corrected Crossfall -2.4%
Case 3
Inputs
Ideal Crossfall -2.0%
Minimum Mill Depth 0
Slope Tolerance 0.50%
Overlay Slope Options User Defined with Flapping
Use Profile Options Minimum Mill Depth
Calculations:
Input Value
Existing Ground Crossfall -1.8%
Existing Ground Crossfall – Ideal Crossfall 0.2%
Slope Tolerance Existing Ground Slope minus Ideal Crossfall is 0.2%, which is less than the 0.5% Slope Tolerance
Corrected Crossfall Corrected Crossfall will be set between -1.5% and -2.5% crossfall
Output Value
Corrected Crossfall -1.8%
Case 4

If the existing ground (EG) crossfall is -2.0% from the IEOL to OEOL, existing ground crossfall minus ideal crossfall is 1%, tolerance is 0.5% < 1% and adjusted crossfall is between -1.5% and -2.5%, then the adjusted crossfall will output at -1.5%.

Inputs
Ideal Crossfall -2.0%
Minimum Mill Depth 0
Slope Tolerance 0.50%
Overlay Slope Options User Defined with Flapping
Use Profile Options Minimum Mill Depth
Calculations:
Input Value
Existing Ground Crossfall -2.0%
Existing Ground Crossfall – Ideal Crossfall 1%
Slope Tolerance Existing Ground Slope minus Ideal Crossfall is 1%, which is greater than the 0.5% Slope Tolerance
Corrected Crossfall Corrected Crossfall will be set between -1.5% and -2.5% crossfall
Output Value
Corrected Crossfall -1.5%

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
P1, P2 EOV Overlay edges on finished gradient
P3, P4 EOV_Overlay Edges of bottom of mill
P5, P6 EOV_Milling Edges of top of mill
L1 Top, Pave Top of overlay
L2, L3, L4 Overlay Links for the overlay layer
L5, L6 Mill Mill links (height) for the milling layer
S1 Overlay Area between the top and bottom of overlay
S2 Mill Area between the top and bottom of mill
Parent topic: Subassembly Reference (continued)