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 Coordinates
Purpose: Describe the purpose of this part.
Concept
Definition
Type
Units
Cardinality
Restrictions
Start of Alignment Coordinate - X
The initial point located by X coordinate from which the alignment is defined and serves as the reference for the entire alignment path.
Real
Feet
required
Start of Alignment Coordinate - Y
The initial point located by Y coordinate from which the alignment is defined and serves as the reference for the entire alignment path.
Real
Feet
required
End of Alignment Coordinate - X
The final point located by X coordinate from which the alignment is defined and serves as the reference for the entire alignment path.
Real
Feet
required
End of Alignment Coordinate - Y
The final point located by Y coordinate from which the alignment is defined and serves as the reference for the entire alignment path.
Real
Feet
required
Concept: Start of Alignment Coordinate - X
Purpose: The initial point located by X coordinate from which the alignment is defined and serves as the reference for the entire alignment path.
Type: Real
Units: Feet
Cardinality: required
Concept: Start of Alignment Coordinate - Y
Purpose: The initial point located by Y coordinate from which the alignment is defined and serves as the reference for the entire alignment path.
Type: Real
Units: Feet
Cardinality: required
Concept: End of Alignment Coordinate - X
Purpose: The final point located by X coordinate from which the alignment is defined and serves as the reference for the entire alignment path.
Type: Real
Units: Feet
Cardinality: required
Concept: End of Alignment Coordinate - Y
Purpose: The final point located by Y coordinate from which the alignment is defined and serves as the reference for the entire alignment path.
Type: Real
Units: Feet
Cardinality: required
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: Azimuth and Bearing
Purpose: Describe the purpose of this part.
Concept
Definition
Type
Units
Cardinality
Restrictions
Bearing
The measure of a line’s direction with respect to compass directions. The direction of a line is expressed in 90 degree increments within the four quadrants of a compass. They are measured north to east, south to east, south to west and north to west and written with the maximums of each being N 90 E, S 90 E, S 90 W and N 90 W.
Real
Degrees
optional
Azimuth
A measure of a line’s direction based on the horizontal angle measured clockwise from north starting at 0 degrees and measuring towards 360 degrees.
Real
Degrees
optional
Bearing
The measure of a line’s direction with respect to compass directions. The direction of a line is expressed in 90 degree increments within the four quadrants of a compass. They are measured north to east, south to east, south to west and north to west and written with the maximums of each being N 90 E, S 90 E, S 90 W and N 90 W.
Real
Degrees
optional
Azimuth
A measure of a line’s direction based on the horizontal angle measured clockwise from north starting at 0 degrees and measuring towards 360 degrees.
Real
Degrees
optional
Concept: Bearing
Purpose: The measure of a line’s direction with respect to compass directions. The direction of a line is expressed in 90 degree increments within the four quadrants of a compass. They are measured north to east, south to east, south to west and north to west and written with the maximums of each being N 90 E, S 90 E, S 90 W and N 90 W.
Type: Real
Units: Degrees
Cardinality: optional
Concept: Azimuth
Purpose: A measure of a line’s direction based on the horizontal angle measured clockwise from north starting at 0 degrees and measuring towards 360 degrees.
Type: Real
Units: Degrees
Cardinality: optional
Concept: Bearing
Purpose: The measure of a line’s direction with respect to compass directions. The direction of a line is expressed in 90 degree increments within the four quadrants of a compass. They are measured north to east, south to east, south to west and north to west and written with the maximums of each being N 90 E, S 90 E, S 90 W and N 90 W.
Type: Real
Units: Degrees
Cardinality: optional
Concept: Azimuth
Purpose: A measure of a line’s direction based on the horizontal angle measured clockwise from north starting at 0 degrees and measuring towards 360 degrees.
Type: Real
Units: Degrees
Cardinality: optional
Part: Circular Alignment
Purpose: Describe the purpose of this part.
Concept
Definition
Type
Units
Cardinality
Restrictions
Central Angle
The angle at the center of radius of a circular arc included between the radii that pass through the beginning point (P.C.) and the ending point (P.T.) of the arc. Also known as the delta angle.
Real
Degrees
required
Degree of Curvature (D)
the arc definition, a D degree curve has an arc length of 100 feet resulting in an internal angle of D degrees
the chord definition, a D degree curve has a chord of 100 feet resulting in an internal angle of D degrees
Real
Degrees / 100 ft
required
Middle Ordinate (MO)
mid-point of arc to mid-point of long chord
Distance from the Mid-point of Curve to the mid-point of the straight line between the P.C. and the P.T. (the Long Chord)
Real
Feet
required
Long Chord (LC)
�Long Chord” - Straight line distance from the P.C. to the P.T.
REal
Feet
required
External Distance (E)
Point of Intersection (PI) to mid-point of curve
Feet
required
Radius
A straight line distance from the center to the circumference of a circular curve.
Real
Feet
required
Concept: Central Angle
Purpose: The angle at the center of radius of a circular arc included between the radii that pass through the beginning point (P.C.) and the ending point (P.T.) of the arc. Also known as the delta angle.
Type: Real
Units: Degrees
Cardinality: required
Concept: Degree of Curvature (D)
Purpose: the arc definition, a D degree curve has an arc length of 100 feet resulting in an internal angle of D degrees
the chord definition, a D degree curve has a chord of 100 feet resulting in an internal angle of D degrees
Type: Real
Units: Degrees / 100 ft
Cardinality: required
Concept: Middle Ordinate (MO)
Purpose: mid-point of arc to mid-point of long chord
Distance from the Mid-point of Curve to the mid-point of the straight line between the P.C. and the P.T. (the Long Chord)
Type: Real
Units: Feet
Cardinality: required
Concept: Long Chord (LC)
Purpose: �Long Chord” - Straight line distance from the P.C. to the P.T.
Type: REal
Units: Feet
Cardinality: required
Concept: External Distance (E)
Purpose: Point of Intersection (PI) to mid-point of curve
Units: Feet
Cardinality: required
Concept: Radius
Purpose: A straight line distance from the center to the circumference of a circular curve.
Type: Real
Units: Feet
Cardinality: required
Part: Direction of Travel
Purpose: Describe the purpose of this part.
Concept
Definition
Type
Units
Cardinality
Restrictions
Direction of Travel
The direction in which vehicles are moving on a roadway maybe expressed in terms of cardinal directions
String
required
enum: N, S, E, W, N/S, E/W
Concept: Direction of Travel
Purpose: The direction in which vehicles are moving on a roadway maybe expressed in terms of cardinal directions
Type: String
Cardinality: required
Restrictions: enum: N, S, E, W, N/S, E/W
Part: Horizontal Alignment Curve Key Stations
Purpose: Describe the purpose of this part.
Concept
Definition
Type
Units
Cardinality
Restrictions
Curve to Spiral Point (CS)
Point of change from circular curve to spiral
Real
Stationing
optional
Station Equation
A point that relates a system of stationing to another system of stationing.
Real
Stationing
optional
Point of Compound Curve (PCC)
Point common to two curves in the same direction with different radii
Real
Stationing
optional
Point of Curvature (PC)
The point where a tangent ends and a curve begins.
Real
Stationing
optional
Point of Intersection (PI)
The point where two tangents of a circular curve meet.
Real
Stationing
optional
Point of Tangency (PT)
The point where a curve ends and straight alignment begins.
Real
Stationing
optional
Spiral to Curve Point (SC)
This is the point where a spiral curve meets the circular curve. It marks the end of the transition from the tangent (straight path) to the circular curve
Real
Stationing
optional
Spiral to Tangent Point (ST)
This is the point where the spiral curve meets the tangent. It marks the end of the transition from the circular curve to the straight path
Real
Stationing
optional
Tangent to Spiral Point (TS)
This is the point where the alignment changes from the back tangent to the entrance spiral
Real
Stationing
optional
Point of Beginning (POB)
The point where an alignment begins.
Real
Stationing
optional
Point of Ending (POE)
The point where an alignment ends.
Real
Stationing
optional
Point on Curve (POC)
Point on a circular curve
Real
Stationing
optional
Concept: Curve to Spiral Point (CS)
Purpose: Point of change from circular curve to spiral
Type: Real
Units: Stationing
Cardinality: optional
Concept: Station Equation
Purpose: A point that relates a system of stationing to another system of stationing.
Type: Real
Units: Stationing
Cardinality: optional
Concept: Point of Compound Curve (PCC)
Purpose: Point common to two curves in the same direction with different radii
Type: Real
Units: Stationing
Cardinality: optional
Concept: Point of Curvature (PC)
Purpose: The point where a tangent ends and a curve begins.
Type: Real
Units: Stationing
Cardinality: optional
Concept: Point of Intersection (PI)
Purpose: The point where two tangents of a circular curve meet.
Type: Real
Units: Stationing
Cardinality: optional
Concept: Point of Tangency (PT)
Purpose: The point where a curve ends and straight alignment begins.
Type: Real
Units: Stationing
Cardinality: optional
Concept: Spiral to Curve Point (SC)
Purpose: This is the point where a spiral curve meets the circular curve. It marks the end of the transition from the tangent (straight path) to the circular curve
Type: Real
Units: Stationing
Cardinality: optional
Concept: Spiral to Tangent Point (ST)
Purpose: This is the point where the spiral curve meets the tangent. It marks the end of the transition from the circular curve to the straight path
Type: Real
Units: Stationing
Cardinality: optional
Concept: Tangent to Spiral Point (TS)
Purpose: This is the point where the alignment changes from the back tangent to the entrance spiral
Type: Real
Units: Stationing
Cardinality: optional
Concept: Point of Beginning (POB)
Purpose: The point where an alignment begins.
Type: Real
Units: Stationing
Cardinality: optional
Concept: Point of Ending (POE)
Purpose: The point where an alignment ends.
Type: Real
Units: Stationing
Cardinality: optional
Concept: Point on Curve (POC)
Purpose: Point on a circular curve
Type: Real
Units: Stationing
Cardinality: optional
Part: Horizontal Alignment Curve Length
Purpose: Describe the purpose of this part.
Concept
Definition
Type
Units
Cardinality
Restrictions
Length of Circular Curve, Lc
Refers to the distance measured along the arc of the curve from the Point of Curvature (PC) to the Point of Tangency (PT). This length is crucial for determining the geometry and alignment of the roadway.
Real
Feet
required
Length of Spiral, Ls
A spiral is a curve of constantly changing radius. The radius at each end matches the alignment into which it is going. Length of spiral refers to the length of this transition.
Real
Feet
required
Concept: Length of Circular Curve, Lc
Purpose: Refers to the distance measured along the arc of the curve from the Point of Curvature (PC) to the Point of Tangency (PT). This length is crucial for determining the geometry and alignment of the roadway.
Type: Real
Units: Feet
Cardinality: required
Concept: Length of Spiral, Ls
Purpose: A spiral is a curve of constantly changing radius. The radius at each end matches the alignment into which it is going. Length of spiral refers to the length of this transition.
Type: Real
Units: Feet
Cardinality: required
Part: Horizontal Alignment Curve Type
Purpose: Describe the purpose of this part.
Concept
Definition
Type
Units
Cardinality
Restrictions
Circular
An arc with a single constant radius connecting two tangents.
Boolean
required
enum: Yes, No
Spiral
A transitional curve where the rate of curvature begins at R = ? (tangent) and gradually decreases to R, which is the curvature of a simple curve.
Boolean
required
enum: Yes, No
Concept: Circular
Purpose: An arc with a single constant radius connecting two tangents.
Type: Boolean
Cardinality: required
Restrictions: enum: Yes, No
Concept: Spiral
Purpose: A transitional curve where the rate of curvature begins at R = ? (tangent) and gradually decreases to R, which is the curvature of a simple curve.
Type: Boolean
Cardinality: required
Restrictions: enum: Yes, No
Part: Horizontal Alignment Designation
Purpose: Describe the purpose of this part.
Concept
Definition
Type
Units
Cardinality
Restrictions
Baseline
Baselines are established as straight line segments or curves between known fixed points, generally within the right-of-way.
Boolean
required
enum: Yes, No
Horizontal Control Line
Control for horizontal alignment. The stationing for the roadway is measured along this line.
Boolean
required
enum: Yes, No
Concept: Baseline
Purpose: Baselines are established as straight line segments or curves between known fixed points, generally within the right-of-way.
Type: Boolean
Cardinality: required
Restrictions: enum: Yes, No
Concept: Horizontal Control Line
Purpose: Control for horizontal alignment. The stationing for the roadway is measured along this line.
Type: Boolean
Cardinality: required
Restrictions: enum: Yes, No
Part: Horizontal Alignment Tangent Key Stations
Purpose: Describe the purpose of this part.
Concept
Definition
Type
Units
Cardinality
Restrictions
Station Equation
A point that relates a system of stationing to another system of stationing.
Real
Stationing
optional
Point of Curvature (PC)
The point where a tangent ends and a curve begins.
Real
Stationing
optional
Point of Intersection (PI)
The point where two tangents of a circular curve meet.
Real
Stationing
optional
Point of Tangency (PT)
The point where a curve ends and straight alignment begins.
Real
Stationing
optional
Spiral to Tangent Point (ST)
This is the point where the spiral curve meets the tangent. It marks the end of the transition from the circular curve to the straight path
Real
Stationing
optional
Tangent to Spiral Point (TS)
This is the point where the alignment changes from the back tangent to the entrance spiral
Real
Stationing
optional
Point of Beginning (POB)
The point where an alignment begins.
Real
Stationing
optional
Point of Ending (POE)
The point where an alignment ends.
Real
Stationing
optional
Point on Tangent (POT)
A point on the tangent line that is used in the projection of the tangent line in a forward direction.
Real
Stationing
optional
Concept: Station Equation
Purpose: A point that relates a system of stationing to another system of stationing.
Type: Real
Units: Stationing
Cardinality: optional
Concept: Point of Curvature (PC)
Purpose: The point where a tangent ends and a curve begins.
Type: Real
Units: Stationing
Cardinality: optional
Concept: Point of Intersection (PI)
Purpose: The point where two tangents of a circular curve meet.
Type: Real
Units: Stationing
Cardinality: optional
Concept: Point of Tangency (PT)
Purpose: The point where a curve ends and straight alignment begins.
Type: Real
Units: Stationing
Cardinality: optional
Concept: Spiral to Tangent Point (ST)
Purpose: This is the point where the spiral curve meets the tangent. It marks the end of the transition from the circular curve to the straight path
Type: Real
Units: Stationing
Cardinality: optional
Concept: Tangent to Spiral Point (TS)
Purpose: This is the point where the alignment changes from the back tangent to the entrance spiral
Type: Real
Units: Stationing
Cardinality: optional
Concept: Point of Beginning (POB)
Purpose: The point where an alignment begins.
Type: Real
Units: Stationing
Cardinality: optional
Concept: Point of Ending (POE)
Purpose: The point where an alignment ends.
Type: Real
Units: Stationing
Cardinality: optional
Concept: Point on Tangent (POT)
Purpose: A point on the tangent line that is used in the projection of the tangent line in a forward direction.
Type: Real
Units: Stationing
Cardinality: optional
Part: Horizontal Alignment Tangent Length
Purpose: Describe the purpose of this part.
Concept
Definition
Type
Units
Cardinality
Restrictions
Tangent Length
Length of straight segments of alignment
Real
Feet
required
Concept: Tangent Length
Purpose: Length of straight segments of alignment
Type: Real
Units: Feet
Cardinality: required
Part: Spiral Alignment
Purpose: Describe the purpose of this part.
Concept
Definition
Type
Units
Cardinality
Restrictions
Spiral Angle
The total angle of deflection between the initial tangent of a road and the common tangent where the transition curve (spiral) meets the circular curve.
Real
Degrees
required
Concept: Spiral Angle
Purpose: The total angle of deflection between the initial tangent of a road and the common tangent where the transition curve (spiral) meets the circular curve.
Type: Real
Units: Degrees
Cardinality: required
Part: Superelevation
Purpose: Describe the purpose of this part.
Concept
Definition
Type
Units
Cardinality
Restrictions
End Normal Crown Station
Refers to the point on a roadway where the typical crown (or cross slope) of the road transitions to a different cross slope, such as when entering a superelevated section.
Real
Stationing
required
Tangent Runout Length
Tangent runout is the longitudinal distance needed to change from a normal crown section to a point where the adverse cross slope of the outside lane or lanes is removed (i.e., the outside lane(s) is level).
Real
Feet
required
Level Crown Station
Refers to the point where the slope of a lane being rotated is 0% or level at the end of the tangent runout.
Real
Stationing
required
Reverse Crown Station
Refers to the point where the slope of a lane being rotated is the reverse of a normal crown.
Real
Stationing
required
Superelevation Runoff Length
Superelevation runoff is the longitudinal distance needed to change the cross slope from the end of the tangent runout (adverse cross slope removed) to a section that is sloped at the design superelevation rate E.
Real
Feet
required
Full Superelevation Length
Refers to the point where the roadway is sloped at the design superelevation rate E.
Real
Feet
required
Concept: End Normal Crown Station
Purpose: Refers to the point on a roadway where the typical crown (or cross slope) of the road transitions to a different cross slope, such as when entering a superelevated section.
Type: Real
Units: Stationing
Cardinality: required
Concept: Tangent Runout Length
Purpose: Tangent runout is the longitudinal distance needed to change from a normal crown section to a point where the adverse cross slope of the outside lane or lanes is removed (i.e., the outside lane(s) is level).
Type: Real
Units: Feet
Cardinality: required
Concept: Level Crown Station
Purpose: Refers to the point where the slope of a lane being rotated is 0% or level at the end of the tangent runout.
Type: Real
Units: Stationing
Cardinality: required
Concept: Reverse Crown Station
Purpose: Refers to the point where the slope of a lane being rotated is the reverse of a normal crown.
Type: Real
Units: Stationing
Cardinality: required
Concept: Superelevation Runoff Length
Purpose: Superelevation runoff is the longitudinal distance needed to change the cross slope from the end of the tangent runout (adverse cross slope removed) to a section that is sloped at the design superelevation rate E.
Type: Real
Units: Feet
Cardinality: required
Concept: Full Superelevation Length
Purpose: Refers to the point where the roadway is sloped at the design superelevation rate E.
Type: Real
Units: Feet
Cardinality: required
Child Classes
Horizontal Alignment Curve
This child class inherits the requirements defined for the parent element.
Horizontal Alignment Tangent
This child class inherits the requirements defined for the parent element.