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## Section 4: Normal Curve Data

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### Normal Curve Defined

Normal Curve documents the location and all the elements necessary to define a route segment that curves at a constant rate (see Figure 12‑1):

Anchor: #i1008774Points of a Normal Curve

Point

Description

Point 1

The Point of Curvature, i.e., the PC point, the beginning of the normal curve segment

Point 2

The Point of Tangency, i.e., the PT point, the ending of the normal curve segment

Figure 13-1. Route curves at a constant rate between PC and PT.

Curve Id—Unique seven-digit identification number the system assigns to each Normal curve. The system stores the number on the record containing the PT point of a normal curve.

Notes:

• Do not add a Normal curve within or across the bounds of another curve
• Do not change the location of a curve to fall within the points of another curve
• Update either the location points of the Normal Curve or the data attributes associated with the Normal Curve. If updating both, input two transactions
• Do not update if the Signed Highway is incorrect; delete and re-enter the curve record
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### Input—Normal Curves

Step

Action

Input

1

(For instructions to log onto the system, click this link)

From the TPP Database Maintenance Menu, select Update-Code 12H and press <E>; the TPP Database Maintenance Submenu appears

-

2

Input X by Normal Curve and press <E>; the Normal Curve Data screen appears

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3

Input Location Key fields

4

Input remaining fields and press <F2>; the system updates TRM with the new information and displays the message “Transaction completed successfully”

• Curve Type N
• Delta Angle measurements:
• Degrees, whole degree values 000 to 179
• Minutes, whole minute values 00 to 59
• Seconds, seconds to one decimal values 00.0 to 59.9
• Left/Right, direction (L or R)
• Tangent Length 1, in miles to three decimals, values 00.000 to 99.999
• Curve Degree Angle measurements:
• Degrees, whole degree values 00 to 89
• Minutes, whole minute values 00 to 59
• Seconds, seconds to one decimal values 00.0 to 59.9
• Length, in miles to three decimals valid values 00.000 thru 99.999

5

• To select Baseline Bearing, PI Curve, or Spiral Curve additions, press <F3> to exit back to the TPP Maintenance Submenu
• To input another Update-Code, press <F3> twice to exit back to the TPP Database Maintenance Menu
• To exit back to the TRM Main Menu, press <F10>

(For instructions to log off the system, click this link)

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Follow these input instructions to delete normal curve:

Anchor: #i1008815Delete Normal Curve

Step

Action

Input

1

(For instructions to log onto the system, click this link)

From the TPP Database Maintenance Menu, select Update-Code 11H and press <E>; the TPP Database Maintenance Submenu appears

-

2

Input an X by Normal Curve and press <E>; the Normal Curve submenu appears

-

3

Input Location Key fields

NOTE: Input only PC or PT point for curve deletion

• Signed Highway System, Number, and Suffix
• From Reference Marker Number and Suffix, (+) or (–) Sign, and Displacement
• To Reference Marker Number and Suffix, (+) or (-) Sign, and Displacement

4

Input remaining fields and press <F2>; the system retrieves record data from TRM. A prompting message “Press PF2 to confirm or PF 11 to cancel” appears

Curve Type N

5

Repress <F2> to confirm deletion; the system displays the verification message “Transaction completed successfully” and deletes all data records associated with the deleted normal curves

OR Press <F11> to cancel deletion; the system takes no action

6

• To select Baseline Bearings, PI Curve, or Spiral Curve deletions, press <F3> to exit back to the TPP Maintenance Submenu
• To input another Update-Code, press <F3> twice to exit back to the TPP Database Maintenance Menu
• To exit back to the TRM Main Menu, press <F10>

(For instructions to log off the system, click this link)

-

Follow these input instructions to update normal curve location:

Anchor: #i1008847Update Normal Curve Location

Step

Action

Input

1

(For instructions to log onto the system, click this link)

From the TPP Database Maintenance Menu, select Update-Code 13H and press <E>; the TPP Database Maintenance Submenu appears

-

2

Input an X by Normal Curve and press <E>; the Normal Curve Data screen appears

-

3

Input Location Key fields

NOTE: Input only the PC or PT point for curve updates

• Signed Highway System, Number, and Suffix
• From Reference Marker Number and Suffix, (+) or (–) Sign, and Displacement
• To Reference Marker Number and Suffix, (+) or (-) Sign, and Displacement

4

Input the remaining fields and press <E>; the system retrieves record data from TRM. A prompting message “Enter new Reference-Marker location” appears

Curve Type N

5

Input the update location fields and press <F2>; the system updates the location and the verification message “Transaction completed successfully” appears. The original request for the current location to update displays for another update transaction

• Update the PC point: any ‘From’ Reference Marker fields
• Update the PT point: any ‘To’ Reference Marker fields

6

• To select Baseline Bearing, PI Curve, or Spiral Curve, press <F3> to exit back to the TPP Maintenance Submenu
• To input another Update-Code, press <F3> twice times to exit back to the TPP Database Maintenance Menu
• To exit back to the TRM Main Menu, press <F10>

(For instructions to log off the system, click this link)

-

Follow these input instructions to update normal curve attributes:

Anchor: #i1008879Update Normal Curve Attributes

Step

Action

Input

1

(For instructions to log onto the system, click this link)

From the TPP Database Maintenance Menu, select Update-Code 13H and press <E>; the TPP Database Maintenance Submenu appears

-

2

Input an X by Normal Curve and press <E>; the Normal Curve Data screen appears

-

3

Input Location Key fields

NOTE: Input only the PC or PT point for curve update

• Signed Highway System, Number, and Suffix
• From Reference Marker Number and Suffix, (+) or (–) Sign, and Displacement
• To Reference Marker Number and Suffix, (+) or (-) Sign, and Displacement

4

Input remaining fields and press <E>; the system retrieves record data from TRM. A prompting message “Enter Updated Attribute Data” appears

Curve Type N

5

Input the update fields and press <F2>; the system updates the attribute and the verification message “Transaction completed successfully” appears. The original request for the current attributes to update displays for another update transaction

• Delta Angle measurements:
• Degrees, whole degree values 000 to 179
• Minutes, whole minute values 00 to 59
• Seconds, seconds to one decimal values 00.0 to 59.9
• Left/Right, direction (L or R)
• Tangent Length 1, in miles to three decimals, values 00.000 to 99.999
• Curve Degree Angle measurements:
• Degrees, whole degree values 00 to 89
• Minutes, whole minute values 00 to 59
• Seconds, seconds to one decimal values 00.0 to 59.9
• Length: in miles to three decimals, valid values 00.000 thru 99.999

6

• To select Baseline Bearing, PI Curve, or Spiral Curve, press <F3> to exit back to the TPP Maintenance Submenu
• To input another Update-Code, press <F3> twice times to exit back to the TPP Database Maintenance Menu
• To exit back to the TRM Main Menu, press <F10>

(For instructions to log off the system, click this link)

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System Response. Because the two points which compose a normal curve also compose the second and third points of a spiral curve, the system:

• Assigns a value of 2 to the Curve Point at the PC point of the curve
• Assigns a value of 3 is to the Curve Point at the PT point of the curve
• Stores all data values with Curve Point 21
• Assigns the next sequential number to the Curve-Id for this curve.