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FHWA Highway Safety Programs

Appendix A: FDE/HSIP Element Data Dictionary

FDE/HSIP Elements

HPMS FE* Element
(Yes/No)

Definition

Corresponding MIRE Element
(Page in MIRE Report)

Roadway Segment

Segment ID

Yes

Unique segment identifier.

12. Segment Identifier (19)

Route Name

Yes

Signed numeric value for the roadway segment.

8. Route Number (18)

Alternate Route Name

Yes

The route or street name, where different from route number.

9. Route/Street Name (18)

Route Type

Yes

Federal-aid/National Highway System (NHS) route type.

21. Federal-aid/Route Type (24)

Area Type

Yes

The rural or urban designation based on Census urban boundary and population.

20. Rural/Urban Designation (23)

Date Opened to Traffic

No

The date at which the site was opened to traffic.

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Start Location

Yes

The location of the starting point of the roadway segment.

10. Begin Point Segment Descriptor (18)

End Location

Yes

The location of the ending point of the roadway segment.

11. End Point Segment Descriptor (19)

Segment Length

Yes

The length of the segment.

13. Segment Length (19)

Segment Direction

No

Direction of inventory if divided roads are inventoried in each direction.

18. Direction of Inventory (22)

Roadway Class

Yes

The functional class of the segment.

19. Functional Class (23)

Median Type

No

The type of median present on the segment.

54. Median Type (45)

Access Control

Yes

The degree of access control.

22. Access Control (25)

Two-Way vs. One-Way Operation

Yes

Indication of whether the segment operates as a one- or two-way roadway.

91. One/Two-Way Operations (64)

Number of Through Lanes

Yes

The total number of through lanes on the segment. This excludes turn lanes and auxiliary lanes.

31. Number of Through Lanes (30)

Interchange Influence Area on Mainline Freeway

No

The value of this item indicates whether or not a roadway is within an interchange influence area. (This can be derived from MIRE Elements 197 & 201.)

197. Location Identifier for Roadway at Beginning Ramp Terminal (136)
201. Location Identifier for Roadway at Ending Ramp Terminal (139)

AADT

Yes

The average number of vehicles passing through a segment from both directions of the mainline route for all days of a specified year

79. Annual Average Daily Traffic (AADT) (60)

AADT Year

Yes

Year of AADT.

80. AADT Year (60)

Intersection

Intersection ID

No

A unique junction identifier.

120. Unique Junction Identifier (84)

Location

No

Location of the center of the junction on the first intersecting route (e.g. route-milepost). (This can be derived from MIRE Elements 122 & 123.)

122. Location Identifier for Road 1 Crossing Point (85)
123. Location Identifier for Road 2 Crossing Point (85)

Intersection Type

No

The type of geometric configuration that best describes the intersection/junction.

126. Intersection/Junction Geometry (87)

Traffic Control Type

No

Traffic control present at intersection/junction.

131. Intersection/ Junction Traffic Control (93)

Major Road AADT

No

The Annual Average Daily Traffic (AADT) on the approach leg of the intersection/junction.

140. Approach AADT (98)

Major Road AADT Year

No

The year of the Annual Average Daily Traffic (AADT) on the approach leg of the intersection/junction.

141. Approach AADT Year (99)

Minor Road AADT

No

The Annual Average Daily Traffic (AADT) on the approach leg of the intersection/junction.

140. Approach AADT (98)

Minor Road AADT Year

No

The year of the Annual Average Daily Traffic (AADT) on the approach leg of the intersection/junction.

141. Approach AADT Year (99)

Intersection Leg ID

No

A unique identifier for each approach of an intersection.

139. Unique Approach Identifier (98)

Leg Type

No

Specifies the major/minor road classification of this leg relative to the other legs in the intersection. (This can be derived from MIRE Element 140).

140. Approach AADT (98)

Leg Segment ID

No

A unique identifier for the segment associated with this leg.

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Ramp/Interchange

Ramp ID

Yes

An identifier for each ramp that is part of a given interchange. This defines which ramp the following elements are describing.

186. Unique Ramp Identifier (129)

Date Opened to Traffic

No

The date at which the site was opened to traffic.

---

Start Location

No

Location on the roadway at the beginning ramp terminal (e.g. route-milepost for that roadway) if the ramp connects with a roadway at that point.

197. Location Identifier for Roadway at Beginning Ramp Terminal (136)

Ramp Type

No

Indicates whether the ramp is used to enter or exit a freeway, or connect two freeways. (This can be derived from MIRE Elements 195 & 199).

195. Roadway Type at Beginning Ramp Terminal (135)
199. Roadway Type at Ending Ramp Terminal (138)

Ramp/Interchange Configuration

No

Describes the characterization of the design of the ramp. (This can be derived from MIRE Element 182).

182. Interchange Type (124)

Ramp Length

No

Length of ramp.

187. Ramp Length (129)

Ramp AADT

Yes

AADT on ramp.

191. Ramp AADT (133)

Ramp AADT Year

No

Year of AADT on ramp.

192. Year of Ramp AADT (133)

*Highway Performance Monitoring System full extent elements required on all Federal-aid highways and ramps located within grade separated interchanges, i.e., NHS and all functional systems excluding rural minor collectors and locals.