OverlayMillCrown

This subassembly adds an overlay layer on top of an existing crowned roadway with a milling layer added as required.

Attachment

The attachment point is the crown point of the overlay layer with finished ground cross slope.

Input Parameters

Note: All dimensions are in meters or feet unless otherwise noted. All slopes are in run-over-rise form unless indicated as a percent slope with a "%" sign.
Parameter Description Type Default
Crown Offset Positive or negative offset of the crown point. Numeric 0.000m (0.000 ft)
Crown Use Profile Options Select to tie the inside edge of the overlay crown point to a profile, or adjust crown point elevation to meet minimum mill depth. User defined Minimum Mill Depth
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 Left Lane This is the start point for calculating existing ground slope for the left lane. Numeric 0.000m (0.000 ft)
Inside Edge of Existing Right Lane This is the start point for calculating existing ground slope for the right lane. Numeric 0.000m (0.000 ft)
Outside Edge of Existing Left Lane This is the end point for calculating existing ground slope for the left lane. Numeric 12.000m (12.00 ft)
Outside Edge of Existing Right Lane This is the end point for calculating existing ground slope for the right lane. Numeric 12.000m (-12.000 ft)
Overlay Depth Depth of the overlay layer. Numeric, positive 0.600m (0.600 ft)
Right and Left Overlay Slope Options Specifies right and left overlay slope options.
Tip: Flapping is a term used to describe how the corrected cross slope 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 cross slope and ideal cross slope. 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 "outside of 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 cross slope will be calculated, relative to the slope tolerance for the subassembly.
    • Flapping Within Tolerance:

      The corrected cross slope will be the existing ground cross slope.

    • Flapping Outside of Tolerance:
      The corrected cross slope will vary and will be the existing ground cross slope plus or minus the slope tolerance value.
      Note: Whether the slope tolerance is added or subtracted depends on which one will bring the values of the existing ground cross slope and the ideal cross slope closer together.
  • User Defined Without Flapping
    Flapping specifies how the corrected cross slope will be calculated, relative to slope tolerance for the subassembly.
    • Flapping Within Tolerance:

      The corrected cross slope will be set equal to the ideal cross slope.

    • Flapping Outside of Tolerance:
      The corrected cross slope will be the ideal cross slope plus or minus the slope tolerance value.
      Note: Whether the slope tolerance is added or subtracted depends on which one will bring the values of the existing ground cross slope and the ideal cross slope closer together.
  • Outside/Inside Lane Superelevation
    Outside or Inside Lane Superelevation will replace Ideal Cross Slope. The corrected cross slope values for the overlay layer will be defined by the superelevation table for the section instead of the ideal cross slope.
    Note: If Outside/Inside Lane Superelevation is chosen but the alignment for the rehab corridor does not have a superelevation table defined, Ideal Cross Slope will be used instead.
    • Within Tolerance:
      • If a superelevation table is defined for the alignment: The corrected cross slope will be the lane superelevation value obtained from the superelevation table.
      • If a superelevation table is not specified for the alignment: The corrected cross slope will be the specified ideal slope.
        Note: This behavior is the same as for the User Defined without Flapping option.
    • Outside of Tolerance:
      • If a superelevation table is defined for the alignment: The corrected cross slope will be the lane superelevation value obtained from the superelevation table plus or minus the slope tolerance value.
      • If a superelevation table is not specified for the alignment: The corrected cross slope will be the specified ideal slope plus or minus the slope tolerance value.
        Note: This behavior is the same as for the User Defined without Flapping option.
  • Match Slope

    The corrected cross slope is always set equal to Existing Ground Slope.

  • Use Ideal Cross Slope

    The corrected cross slope is always set equal to Ideal Cross Slope.

User defined User Defined Without Flapping
Left Ideal Cross Slope Specifies user defined left ideal cross slope. Numeric, negative -2.00%
Left Minimum Mill Depth The minimum mill depth between the bottom of the milling layer to the bottom of the existing ground layer on the left side. Numeric, positive 0.300m (0.300 ft)
Left Slope Tolerance Tolerance for varying the left overlay slope. Numeric 0.50%
Right Ideal Cross Slope Specifies user defined right ideal cross slope. Numeric, negative -2.00%
Right Minimum Mill Depth The minimum mill depth between the bottom of the milling layer to the bottom of the existing ground layer on the right side. Numeric, positive 0.300m (0.300 ft)
Right Slope Tolerance Tolerance for varying the left overlay slope. Numeric 0.50%
Left Lane Width The left lane width, determined by the offset of the outside edge of the left lane from the inside edge of left lane. Numeric, negative -12.000m (-12.000 ft)
Right Lane Width The right lane width, determined by the offset of the outside edge of the right lane from the inside edge of right lane. Numeric, positive 12.000m (12.000 ft)

Output Parameters

Parameter Description Type Default
Left Corrected Cross Slope This is the adjusted cross slope for the left side of the road, which has been optimized to match, as closely as possible, the rehab subassembly parameters you specified. Numeric -2.00%
Right Corrected Cross Slope This is the adjusted cross slope for the right side of the road, which has been optimized to match, as closely as possible, the rehab subassembly parameters you specified. Numeric -2.00%
Left Existing Ground Slope The cross slope (%) of the existing ground profile for the left lane, calculated from the inside edge of the left lane to the outside edge of the left lane. Numeric percentage
Right Existing Ground Slope The cross slope (%) of the existing ground profile for the right side of the road, calculated from the inside edge of the right lane to the outside edge of the right lane. Numeric percentage

Target Parameters

Parameter Description Required?
Target Surface Name of the surface defining the existing roadway 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
Left Lane Width Target Name of the object defining the offset of the outside edge of left lane. The following object types can be used as targets for specifying this offset: alignments, polylines, feature lines, or survey figures. No
Right Lane Width Target Name of the object defining the offset of the outside edge of right lane. The following object types can be used as targets for specifying this offset: alignments, polylines, feature lines, or survey figures. No
Left Inside Edge of Existing Lane Offset Target Name of the object defining the left 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
Left Outside Edge of Existing Lane Offset Target Name of the object defining the left 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
Right Inside Edge of Existing Lane Offset Target Name of the object defining the right 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
Right Outside Edge of Existing Lane Offset Target Name of the object defining the right 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

Behavior

This subassembly assumes that no leveling layer is added.

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 Crown Crown point for top of overlay
P2, P3 EOV Overlay edges on finished grade for the left and right side of the road
P4 Crown_Overlay Crown point for bottom of mill
P5, P6 EOV_Overlay Edges of bottom of mill for the left and right side of the road
P7, P8 EOV_Milling Edges of top of mill for the left and right side of the road
P9 Crown_offset Offset of the crown point from attachment point.
L1, L2 Top, Pave Top of overlay for left and right side of road
L3, L4, L5, L6 Overlay Links for the overlay layer.
L7, L8 Mill Mill links (height) for left and right side of road
S1 Overlay Area between the top and bottom of overlay
S2 Mill Area between the top and bottom of mill

Coding Diagram

Parent topic: Subassembly Reference (continued)