Exchange Requirement: Vertical Alignment
Download a Word File of this exchange requirement: Here
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Child Classes
Parts (Property Sets)
- Alignment General
- Sight Distance
- Vertical Alignment Grades
- Vertical Alignment Key Stations and Elevations
- Vertical Alignment Offsets
- Vertical Alignment Reference
- Vertical Curve Lengths
- Vertical Curve Type
Name
Vertical Alignment
Identifier
er_vertical-alignment
Change Log
| Date (yyyy-mm-dd) | Action | Author (email) |
|---|---|---|
Project Stage
Select the applicable project stage(s); remove rows that do not apply.
| Code | Stage |
|---|---|
| 0 | Portfolio requirements |
| 1 | Conception of need |
| 2 | Outline feasibility |
| 3 | Substantive feasibility |
| 4 | Outline conceptual design |
| 5 | Full conceptual design |
| 6 | Coordinated design and procurement |
| 7 | Production information |
| 8 | Construction |
| 9 | Operation and maintenance |
| 10 | Disposal |
Overview
Provide a textual overview of the exchange requirement under the headings Scope, General Description and Information Description. Keep it non-technical and aimed at an executive audience.
Scope
Define the scope of the exchange requirement.
General Description
Provide a simple description of how the exchange requirement will meet the scope.
Information Description
- US Roads Data Dictionary as captured in “WORKING-US-RoadsDD-v1.2.xlsx”
Information Requirements
Preconditions
What information must exist or what actions must be completed before this exchange requirement occurs?
Parts
Part: Alignment General
- Purpose: Describe the purpose of this part.
| Concept | Definition | Type | Units | Cardinality | Restrictions |
|---|---|---|---|---|---|
| Alignment ID | Unique identification of the alignment for reference for vertical alignment, corridor elements, and other roadside components. | String | required | ||
| Alignment Description | Description of the alignment to further explain purpose and/or location. | String | required |
Concept: Alignment ID
- Purpose: Unique identification of the alignment for reference for vertical alignment, corridor elements, and other roadside components.
- Type: String
- Cardinality: required
Concept: Alignment Description
- Purpose: Description of the alignment to further explain purpose and/or location.
- Type: String
- Cardinality: required
Part: Sight Distance
- Purpose: Describe the purpose of this part.
| Concept | Definition | Type | Units | Cardinality | Restrictions |
|---|---|---|---|---|---|
| Headlight sight distance | Stopping sight distance for a sag vertical curve | Real | Feet | optional | |
| Stopping sight distance | Stopping sight distance is the distance necessary for a vehicle traveling at or near the design speed to stop before reaching a stationary object in its path. For vertical alignments, applies to crest vertical curve. | Real | Feet | optional | |
| Passing sight distance | On two-lane, two-way roadways, provision for a vehicle to pass a slower vehicle while occupying the lane regularly used by opposing traffic. | Real | Feet | optional | |
| K-Value | The horizontal distance needed to produce a 1% change in gradient. | Real | Feet | optional |
Concept: Headlight sight distance
- Purpose: Stopping sight distance for a sag vertical curve
- Type: Real
- Units: Feet
- Cardinality: optional
Concept: Stopping sight distance
- Purpose: Stopping sight distance is the distance necessary for a vehicle traveling at or near the design speed to stop before reaching a stationary object in its path. For vertical alignments, applies to crest vertical curve.
- Type: Real
- Units: Feet
- Cardinality: optional
Concept: Passing sight distance
- Purpose: On two-lane, two-way roadways, provision for a vehicle to pass a slower vehicle while occupying the lane regularly used by opposing traffic.
- Type: Real
- Units: Feet
- Cardinality: optional
Concept: K-Value
- Purpose: The horizontal distance needed to produce a 1% change in gradient.
- Type: Real
- Units: Feet
- Cardinality: optional
Part: Vertical Alignment Grades
- Purpose: Describe the purpose of this part.
| Concept | Definition | Type | Units | Cardinality | Restrictions |
|---|---|---|---|---|---|
| Incoming Grade (G1) | Slope of profile as it approaches a specific point. Typically expressed as a percentage, indicating the vertical rise or fall over a horizontal distance | Real | required | ||
| Outgoing Grade (G2) | Slope of profile as it departs a specific point. Typically expressed as a percentage, indicating the vertical rise or fall over a horizontal distance | Real | required | ||
| Incoming Grade (G1) | Slope of profile as it approaches a specific point. Typically expressed as a percentage, indicating the vertical rise or fall over a horizontal distance | Real | required | ||
| Outgoing Grade (G2) | Slope of profile as it departs a specific point. Typically expressed as a percentage, indicating the vertical rise or fall over a horizontal distance | Real | required |
Concept: Incoming Grade (G1)
- Purpose: Slope of profile as it approaches a specific point. Typically expressed as a percentage, indicating the vertical rise or fall over a horizontal distance
- Type: Real
- Cardinality: required
Concept: Outgoing Grade (G2)
- Purpose: Slope of profile as it departs a specific point. Typically expressed as a percentage, indicating the vertical rise or fall over a horizontal distance
- Type: Real
- Cardinality: required
Concept: Incoming Grade (G1)
- Purpose: Slope of profile as it approaches a specific point. Typically expressed as a percentage, indicating the vertical rise or fall over a horizontal distance
- Type: Real
- Cardinality: required
Concept: Outgoing Grade (G2)
- Purpose: Slope of profile as it departs a specific point. Typically expressed as a percentage, indicating the vertical rise or fall over a horizontal distance
- Type: Real
- Cardinality: required
Part: Vertical Alignment Key Stations and Elevations
- Purpose: Describe the purpose of this part.
| Concept | Definition | Type | Units | Cardinality | Restrictions |
|---|---|---|---|---|---|
| Point of Vertical Curvature (PVC) Station | The station of the point at which a tangent grade ends and the vertical curve begins. | Real | Stationing | optional | |
| Point of Vertical Curvature (PVC) Elevation | The elevation of the point at which a tangent grade ends and the vertical curve begins. | Real | Feet | optional | |
| Point of Vertical Intersection (PVI) Station | The station of the point where the extension of two tangent grades intersect. | Real | Stationing | optional | |
| Point of Vertical Intersection (PVI) Elevation | The elevation of the point where the extension of two tangent grades intersect. | Real | Feet | optional | |
| Point of Vertical Tangency (PVT) Station | The station of the point at which the vertical curve ends and the tangent grade begins. | Real | Stationing | optional | |
| Point of Vertical Tangency (PVT) Elevation | The elevation of the point at which the vertical curve ends and the tangent grade begins. | Real | Feet | optional | |
| High Point Station | The station at the highest point on a curve where the gradient changes from positive to negative. | Real | Stationing | optional | |
| High Point Elevation | The elevation at the highest point on a curve where the gradient changes from positive to negative. | Real | Feet | optional | |
| Low Point Station | The station at the lowest point on a curve where the gradient changes from negative to positive | Real | Stationing | optional | |
| Low Point Elevation | The elevation at the lowest point on a curve where the gradient changes from negative to positive | Real | Feet | optional | |
| Point of Vertical Curvature (PVC) Station | The station of the point at which a tangent grade ends and the vertical curve begins. | Real | Stationing | optional | |
| Point of Vertical Curvature (PVC) Elevation | The elevation of the point at which a tangent grade ends and the vertical curve begins. | Real | Feet | optional | |
| Point of Vertical Intersection (PVI) Station | The station of the point where the extension of two tangent grades intersect. | Real | Stationing | optional | |
| Point of Vertical Intersection (PVI) Elevation | The elevation of the point where the extension of two tangent grades intersect. | Real | Feet | optional | |
| Point of Vertical Tangency (PVT) Station | The station of the point at which the vertical curve ends and the tangent grade begins. | Real | Stationing | optional | |
| Point of Vertical Tangency (PVT) Elevation | The elevation of the point at which the vertical curve ends and the tangent grade begins. | Real | Feet | optional |
Concept: Point of Vertical Curvature (PVC) Station
- Purpose: The station of the point at which a tangent grade ends and the vertical curve begins.
- Type: Real
- Units: Stationing
- Cardinality: optional
Concept: Point of Vertical Curvature (PVC) Elevation
- Purpose: The elevation of the point at which a tangent grade ends and the vertical curve begins.
- Type: Real
- Units: Feet
- Cardinality: optional
Concept: Point of Vertical Intersection (PVI) Station
- Purpose: The station of the point where the extension of two tangent grades intersect.
- Type: Real
- Units: Stationing
- Cardinality: optional
Concept: Point of Vertical Intersection (PVI) Elevation
- Purpose: The elevation of the point where the extension of two tangent grades intersect.
- Type: Real
- Units: Feet
- Cardinality: optional
Concept: Point of Vertical Tangency (PVT) Station
- Purpose: The station of the point at which the vertical curve ends and the tangent grade begins.
- Type: Real
- Units: Stationing
- Cardinality: optional
Concept: Point of Vertical Tangency (PVT) Elevation
- Purpose: The elevation of the point at which the vertical curve ends and the tangent grade begins.
- Type: Real
- Units: Feet
- Cardinality: optional
Concept: High Point Station
- Purpose: The station at the highest point on a curve where the gradient changes from positive to negative.
- Type: Real
- Units: Stationing
- Cardinality: optional
Concept: High Point Elevation
- Purpose: The elevation at the highest point on a curve where the gradient changes from positive to negative.
- Type: Real
- Units: Feet
- Cardinality: optional
Concept: Low Point Station
- Purpose: The station at the lowest point on a curve where the gradient changes from negative to positive
- Type: Real
- Units: Stationing
- Cardinality: optional
Concept: Low Point Elevation
- Purpose: The elevation at the lowest point on a curve where the gradient changes from negative to positive
- Type: Real
- Units: Feet
- Cardinality: optional
Concept: Point of Vertical Curvature (PVC) Station
- Purpose: The station of the point at which a tangent grade ends and the vertical curve begins.
- Type: Real
- Units: Stationing
- Cardinality: optional
Concept: Point of Vertical Curvature (PVC) Elevation
- Purpose: The elevation of the point at which a tangent grade ends and the vertical curve begins.
- Type: Real
- Units: Feet
- Cardinality: optional
Concept: Point of Vertical Intersection (PVI) Station
- Purpose: The station of the point where the extension of two tangent grades intersect.
- Type: Real
- Units: Stationing
- Cardinality: optional
Concept: Point of Vertical Intersection (PVI) Elevation
- Purpose: The elevation of the point where the extension of two tangent grades intersect.
- Type: Real
- Units: Feet
- Cardinality: optional
Concept: Point of Vertical Tangency (PVT) Station
- Purpose: The station of the point at which the vertical curve ends and the tangent grade begins.
- Type: Real
- Units: Stationing
- Cardinality: optional
Concept: Point of Vertical Tangency (PVT) Elevation
- Purpose: The elevation of the point at which the vertical curve ends and the tangent grade begins.
- Type: Real
- Units: Feet
- Cardinality: optional
Part: Vertical Alignment Offsets
- Purpose: Describe the purpose of this part.
| Concept | Definition | Type | Units | Cardinality | Restrictions |
|---|---|---|---|---|---|
| Offset from Horizontal Alignment | The distance measured from a primary alignment (centerline of the road) to another point of interest, such as a secondary road, lane, or feature like a shoulder or barrier. | Real | Feet | optional |
Concept: Offset from Horizontal Alignment
- Purpose: The distance measured from a primary alignment (centerline of the road) to another point of interest, such as a secondary road, lane, or feature like a shoulder or barrier.
- Type: Real
- Units: Feet
- Cardinality: optional
Part: Vertical Alignment Reference
- Purpose: Describe the purpose of this part.
| Concept | Definition | Type | Units | Cardinality | Restrictions |
|---|---|---|---|---|---|
| Horizontal Alignment ID | The horizontal alignment to which the vertical alignment is associated. | String | required |
Concept: Horizontal Alignment ID
- Purpose: The horizontal alignment to which the vertical alignment is associated.
- Type: String
- Cardinality: required
Part: Vertical Curve Lengths
- Purpose: Describe the purpose of this part.
| Concept | Definition | Type | Units | Cardinality | Restrictions |
|---|---|---|---|---|---|
| Length of Vertical Curve | The horizontal distance in feet from the PVC to the PVT. | Real | Feet | required | |
| Middle Ordinate (MO) - Vertical | the maximum distance between the midpoint of the curve and the midpoint of the long chord. | Real | Feet | required |
Concept: Length of Vertical Curve
- Purpose: The horizontal distance in feet from the PVC to the PVT.
- Type: Real
- Units: Feet
- Cardinality: required
Concept: Middle Ordinate (MO) - Vertical
- Purpose: the maximum distance between the midpoint of the curve and the midpoint of the long chord.
- Type: Real
- Units: Feet
- Cardinality: required
Part: Vertical Curve Type
- Purpose: Describe the purpose of this part.
| Concept | Definition | Type | Units | Cardinality | Restrictions |
|---|---|---|---|---|---|
| Symmetrical Curve | A vertical curve in which the Point of Vertical Intersection (PVI) is located at the midpoint between the Point of Vertical Curvature (PVC) and the Point of Vertical Tangency (PVT). This configuration results in equal curve lengths on both sides of the VPI, providing a balanced transition between grades. | Boolean | required | enum: Yes, No | |
| Unsymmetrical Curve | A vertical curve in which the Point of Vertical Intersection (PVI) is not located at the midpoint between the Point of Vertical Curvature (PVC) and the Point of Vertical Tangency (PVT). This results in unequal lengths of curve before and after the PVI, typically used when design constraints require different approach and departure grades or limited space. | Boolean | required | enum: Yes, No |
Concept: Symmetrical Curve
- Purpose: A vertical curve in which the Point of Vertical Intersection (PVI) is located at the midpoint between the Point of Vertical Curvature (PVC) and the Point of Vertical Tangency (PVT). This configuration results in equal curve lengths on both sides of the VPI, providing a balanced transition between grades.
- Type: Boolean
- Cardinality: required
- Restrictions: enum: Yes, No
Concept: Unsymmetrical Curve
- Purpose: A vertical curve in which the Point of Vertical Intersection (PVI) is not located at the midpoint between the Point of Vertical Curvature (PVC) and the Point of Vertical Tangency (PVT). This results in unequal lengths of curve before and after the PVI, typically used when design constraints require different approach and departure grades or limited space.
- Type: Boolean
- Cardinality: required
- Restrictions: enum: Yes, No
Child Classes
Vertical Alignment Curve
This child class inherits the requirements defined for the parent element.
Vertical Alignment Tangent
This child class inherits the requirements defined for the parent element.