ShoulderParabolicDaylight

The ShoulderParabolicDaylight subassembly provides rounding at the Point of Vertical Intersection (PVI) between the shoulder and daylight links as well as fillet rounding between the daylight link and target surface.

In addition, you have the option to either define the shoulder width dimension from the origin to the PVI or from the origin to the BVC (Beginning of Vertical Curvature).

Origin to PVI Case:

Origin to BVC Case:

Attachment

The attachment point is at the inside edge of the paved shoulder, which is typically at the outside edge-of-traveled way.

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
Side	Specifies which side to place the subassembly.	Left/Right	Right
Shoulder Width	Width from the attachment point to the shoulder hinge point.	Numeric, positive	10 ft 3 m
Shoulder Width Definition	Width of shoulder is measured from application point to this location.	PVI/BVC	PVI
Daylight Rounding Length (Optional)	Specifies value for length.	Numeric, positive	5 ft 1.5 m
Parabola Horizontal Length	Length of the parabola at the PVI or BVC.	Numeric, positive	8 ft 2.5 m
Daylight Grade (+/- for cut/fill)	The +/- % grade of the daylight slope.	Numeric	50 ( % )
Shoulder Grade	The +/- % grade of the shoulder.	Numeric	5 ( % )

Target Parameters

This section lists the parameters in this subassembly that can be mapped to one or more target objects. For more information, see To Specify Corridor Targets.

Parameter	Description	Status
Daylight Surface	Name of the daylighting surface. The following object types can be used as targets for specifying the surface: surfaces.	Optional

Runtime Logical Assignments

None.

Output Parameters

None.

Behavior

The subassembly builds the shape for a shoulder. The subassembly calculates the shape by using the PVI or BVC. The subassembly then checks to ensure there is sufficient space for the daylight rounding.

If there is not enough room for the daylight rounding then the length of the curve is adjusted to provide adequate length for daylight rounding.

It then checks whether parabola grade in and parabola grade out are the same value. If the same grade is found a link is drawn. If they are not the same, then either a sag or crest parabola curve is created. If applicable, a point is added for either the high point or low point on the parabolic curve.

Layout Mode Operation

In layout mode the subassembly displays the links comprising the shoulder.

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 - P5	Top
L1 - L4	Top