OverlayMillLevelCrown

This subassembly adds an overlay layer to an existing crowned roadway, with either a leveling and milling layer added as required.

Attachment

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

Input Parameters

Parameter Description Type Default
Crown Offset Positive or negative offset of the crown point. Numeric 0.000m
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
Inside Edge of Existing Right Lane This is the start point for calculating existing ground slope for the right lane. Numeric 0.000m
Outside Edge of Existing Left Lane This is the end point for calculating existing ground slope for the left lane. Numeric 12.000m
Outside Edge of Existing Right Lane This is the end point for calculating existing ground slope for the right lane. Numeric -12.000m
Use Profile Options Select to tie the inside edge of an overlay to a profile, or adjust elevation to minimum level depth. User defined Minimum Level Depth
Overlay Depth Depth of the overlay layer. Numeric, positive 0.300m
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. User defined, numeric -2.00%
Left Minimum Level Depth The minimum level depth between the bottom of the milling layer to the bottom of the overlay layer on the left side. Numeric, positive 0.600m
Left Minimum Mill Depth The minimum mill depth from the bottom of the milling layer to the bottom of the existing ground layer on the left side. Numeric, positive 0.300m
Left Slope Tolerance Tolerance for varying the left overlay slope. Numeric, positive 0.50%
Right Overlay Slope Options Specifies right overlay slope options. User defined User Defined Without Flapping
Right Ideal Cross Slope Specifies user defined right ideal cross slope. Numeric -2.00%
Right Minimum Level Depth The minimum level depth between the bottom of the milling layer to the bottom of the overlay layer on the right side. Numeric, positive. 0.600m
Right Minimum Mill Depth The minimum mill depth from the bottom of the milling layer to the bottom of the existing ground layer on the right side. Numeric, positive 0.300m
Right Slope Tolerance Tolerance for varying the right overlay slope. Numeric, positive 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
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

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, negative -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, negative -2.00%
Left EG 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, negative n/a
Right EG 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, negative n/a

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 overlay layer assumes that flapping is applied within slope tolerance. Elevation at the crown will meet both sides of the roadway.

Point, Link, and Shape Codes

Point, Link, or Shape Code Description
P1, Crown Crown point for top of overlay
P2, P3 EOV Edges of overlay for finished grade
P4 Crown_Overlay Crown point for bottom of overlay
P5, P6 EOV_Overlay Edges of bottom of overlay for left and right side of the road
P7 Crown_Milling Crown point for top of mill
P8, P9 EOV_Milling Edges of mill for right and left side of road
L1, L2 Top, Pave Top of overlay for left and right side of the road
L3, L4, L5, L6 Overlay Overlay links for the left and right side of the road
L7, L8 Level, Mill, Datum Links for the milling layer
L9, L10 Level Level links for the left and right side of the road
L11, L12 Mill Mill links for the left and right side of the road
S1 Overlay Area between the top and bottom of the overlay
S2 Level Area between the top and bottom of the level
S3 Mill Area between the top and bottom of the mill

Coding Diagram

Parent topic: Subassembly Reference (continued)