Chapter 11: Features

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Section 1: Key Points to Know

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Feature Data Defined

Feature data consists of roadway features created almost exclusively for display on the Automated Roadway Inventory Diagram (ARI). This chapter describes the features included in TRM and gives detailed instructions for adding, deleting, or updating features and their attributes.

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TRM Features/Responsible Office Table

The TRM Features Table lists each roadway feature; information provided includes:

  • Features within each selection
  • Valid Roadbed-IDS.

TRM Feature maintenance for which TPP is responsible:

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Feature Category

Feature Includes:

Valid Roadbeds

Boundary Data

  • Begin/End
  • Type
  • Skew; also Figure 10‑1 and Figure 10‑2 in the next subsection
  • Value
  • Notation

C, N, X, Y, A, B

Feature Data

K, R, L, M, S, T, P, X, Y, A, B, N



TRM Feature maintenance for which TPP and the districts are responsible:

Anchor: #i1052230TPP and District TRM Features

Feature Category

Feature Includes:

Valid Roadbeds

Feature Data

K, R, L, M, S, T, P, X, Y, A, B, N



TRM Feature maintenance for which districts are responsible:

Anchor: #i1052242District TRM Features

Feature Category

Feature Includes:

Valid Roadbeds

Feature Data

K, R, L, M, S, T, P, X, Y, A, B, N



Click this link for your district’s TRM analyst.

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Definitions

Feature Skew—Identifies the Quadrant, Type of intersection, and Angle from perpendicular of an intersecting roadway or feature; format is QIAA:

  • Quadrant (Quad)
    Anchor: #i1107488Feature Skew Quadrant

    Value

    Quadrant

    1

    Right Forward

    2

    Right Back

    3

    Left Back

    4

    Left Forward


  • Intersection Type
    Anchor: #i1052274Feature Skew Intersection Type

    Value

    Type of intersection

    0

    Stops at roadbed/centerline

    1

    Continues across roadbed/centerline


  • Angle of intersecting feature (see Figure 11‑1 below)
    Anchor: #i1052287Feature Skew Intersecting Feature Angle
    • Created with imaginary perpendicular line from the intersecting feature.
    • Input values are: 00 - 90 (degree increments)


Illustration:

Quad-Intersection Type-Skew Angle: 3-1-45 (click in image to see full-size image) Anchor: #i999488grtop

Figure 11-1. Quad-Intersection Type-Skew Angle: 3-1-45

Find the Roadway Feature Skew by placing an imaginary perpendicular line at the centerline point of the intersection and matching the quad with the angle of intersection based on ascending reference marker direction; this creates four imaginary quadrants, or “quads”.

Give the quad in which the intersecting feature is located a value (in Figure 11‑2, the red line represents the intersecting feature at centerline). Perpendicular features that lie between quads are input in either one:

Examples of quads-intersection types-skew angles. (click in image to see full-size image) Anchor: #i999492grtop

Figure 11-2. Examples of quads-intersection types-skew angles.

Intersecting Feature Type Values—Distinguishes between different intersecting features:

Anchor: #i1052292Intersecting Features Type Values

Value

Feature

Value

Feature

11

On-System Mainlane

73

Culvert Flowing Left

21

Local Road

74

Culvert Flowing Right

31

On-System Frontage Road

75

Culvert Flowing Both Directions

41

Federal Lands Road

80

Pipeline

51

State Lands Road

81

Transmission Line

61

On-System Toll Road Frontage Roads

82

Telephone Line

65

Crossover

83

Water Line

66

Turnaround Backward

90

Pedestrian Passageway

67

Turnaround Forward

91

Cattle Guard

70

Railroad Crossing

92

Gate

71

Stream Flowing Left

93

Overhead Sign

72

Stream Flowing Right

99

Other Intersecting Feature



EXAMPLE: A ramp is a roadway feature with Roadway Feature value 32. A crossover is an intersecting roadway feature with Roadway Feature value 33 and Intersecting Feature Type value 65. The Roadway Feature value for all intersecting roadway features is 33.

Intersection Type Values—Distinguishes the grade of the intersecting feature:

Anchor: #i1052361Intersection Type Values

Value

Type

A

At- grade intersection

B

Grade separated intersection (no ramps or connectors)

C

Interchange (at least one ramp and/or connectors)

D

Channelized intersection



Roadway Feature Values—Distinguishes between different features:

Anchor: #i1052380Roadway Feature Values

Value

Feature

24

Gap (System Generated)

25

Ferry

31

Connector

32

Ramp

33

Intersection

34

Structure

35

Boundary

36

Tunnel

41

Roadside feature

99

Other feature (not intersecting)



Roadway Grade Values—Horizontal Level of roadbed:

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Value

Feature Grade

U

Feature is Up above grade

G

Feature is at-Grade

D

Feature is Down below grade


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General Feature Constraints

Apply these constraints when adding, updating, or deleting roadway features:

Anchor: #i1052433Roadway Feature Constraints

Action

Description

Add, update, or delete

All roadway features as point data

Do not update

If the Signed Highway is incorrect; delete and re-enter the feature record

Update either

The feature’s location point OR the feature’s data attributes. If updating both, input two transactions



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