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OverlayMillLevel1Lane1Side

This subassembly adds an overlay layer to one side of an existing roadway, with either a milling or leveling layer added as required.

Attachment

The attachment point is the inside edge point of the overlay layer with finished grade 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
Side Specifies which side of the road centerline to place the rehab subassembly. User defined Left
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 start point for calculating existing ground slope. Numeric 0.000m
Overlay Depth Depth of the overlay layer. Numeric, positive 0.300m
Overlay Slope Options Specifies 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
Ideal Cross Slope Specifies user defined ideal cross slope. 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 elevation to minimum level depth, or lock to previous subassembly.
  • Minimum Level Depth

    The cross slope and elevation adjustments will meet Minimum Level and/or Minimum Mill Depth. The base is the existing surface.

  • Use Profile

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

  • Lock to Previous

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

User defined Minimum Level Depth
Minimum Level Depth The minimum level depth between the bottom of the milling layer to the bottom of the overlay layer. Numeric 0.600m
Minimum Mill Depth The minimum mill depth between the bottom of the milling layer to the bottom of the existing ground layer. Numeric 0.300m
Slope Tolerance Tolerance for varying the overlay slope. Numeric 0.50%

Output Parameters

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

Behavior

  • Areas must be provided for all layers.
  • The Leveling area is equal to the areas of Level 1 + Mill layers combined.
  • The Milling Area layer is represented in the diagram below as Mill.
  • Minimum Level Depth is equal to the area from the bottom of the milling layer to the bottom of the overlay layer.

Special Case

The following is an example when Use Profile is selected in Profile Options and the overlay is located below the existing ground.

Behaviors:
  • The Minimum Mill Depth is measured down from the bottom of Overlay to the Datum layer.
  • The area of Minimum Mill Depth will be filled as Level area.
  • Total Mill area is from the Datum layer to the Existing Ground layer.

Point, Link and Shape Codes

Point, Link or Shape Code Description
P1, P2 EOV Overlay edges on finished grade (edges of top of overlay)
P3, P4 EOV_Overlay Overlay edges beneath leveling layer (edges of bottom of overlay)
P7, P8 EOV_Milling Overlay edges beneath milling layer (edges of bottom of mill)
L1 Top, Pave Top of overlay
L2, L3, L4 Overlay Overlay links
L5, L6 Level For the leveling case
L7, L8 Mill For the milling case
L9 Level, Mill, Datum Links for the milling layer
S1 Overlay Area between the top and bottom of overlay. This area overlaps the leveling area as shown in the coding diagram below
S2 Level Area above existing surface and below the bottom of overlay (leveling case)
S3 Mill Area between bottom of existing surface and bottom of mill (milling case)
Note: Multiple Links will occur when the Existing Ground surface is not smooth. This is shown in the image below by L10.
Parent topic: Subassembly Reference (continued)

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