23 CFR 924.17 - MIRE fundamental data elements.

Regulations last checked for updates: Feb 10, 2026

Title 23 - Highways last revised: Jan 02, 2026

View all text of Part 924 [§ 924.1 - § 924.17]

§ 924.17 - MIRE fundamental data elements.

The MIRE fundamental data elements shall be collected on all public roads, as listed in Tables 1, 2, and 3 of this section. For the purpose of MIRE fundamental data elements applicability, the term open to public travel is consistent with 23 CFR 460.2(c).

Table 1—MIRE Fundamental Data Elements for Non-Local (Based on Functional Classification) Paved Roads

MIRE name (MIRE No.) ¹
Roadway segment	Intersection
Segment Identifier (12)	Unique Junction Identifier (120).
Route Number (8) ²	Location Identifier for Road 1 Crossing Point (122).
Route/street Name (9) ²	Location Identifier for Road 2 Crossing Point (123).
Federal Aid/Route Type (21) ²	Intersection/Junction Geometry (126).
Rural/Urban Designation (20) ²	Intersection/Junction Traffic Control (131).
Surface Type (23) ²	AADT (79) [for Each Intersecting Road].
Begin Point Segment Descriptor (10) ²	AADT Year (80) [for Each Intersecting Road].
End Point Segment Descriptor (11) ²
Segment Length (13) ²
Direction of Inventory (18)	Unique Approach Identifier (139).
Functional Class (19) ²
Median Type (54)
Access Control (22) ²
One/Two-Way Operations (91) ²	Interchange/Ramp.
Number of Through Lanes (31) ²	Unique Interchange Identifier (178).
Average Annual Daily Traffic (79) ²	Location Identifier for Roadway at Beginning Ramp Terminal (197).
AADT Year (80) ²	Location Identifier for Roadway at Ending Ramp Terminal (201).
Type of Governmental Ownership (4) ²	Ramp Length (187).
	Roadway Type at Beginning Ramp Terminal (195).
	Roadway Type at Ending Ramp Terminal (199).
	Interchange Type (182).
	Ramp AADT (191). ²
	Year of Ramp AADT (192). ²
	Functional Class (19). ²
	Type of Governmental Ownership (4). ²

¹ Model Inventory of Roadway Elements—MIRE, Version 1.0, Report No. FHWA-SA-10-018, October 2010, http://safety.fhwa.dot.gov/tools/data_'tools/mirereport/mirereport.pdf.

² Highway Performance Monitoring System full extent elements are required on all Federal-aid highways and ramps located within grade-separated interchanges, i.e., National Highway System (NHS) and all functional systems excluding rural minor collectors and locals.

Table 2—MIRE Fundamental Data Elements for Local (Based on Functional Classification) Paved Roads

MIRE name (MIRE No.) ¹
Roadway segment:
Segment Identifier (12).
Functional Class (19). ²
Surface Type (23). ²
Type of Governmental Ownership (4). ²
Number of Through Lanes (31). ²
Average Annual Daily Traffic (79). ²
Begin Point Segment Descriptor (10). ²
End Point Segment Descriptor (11). ²
Rural/Urban Designation (20). ²

¹ Model Inventory of Roadway Elements—MIRE, Version 1.0, Report No. FHWA-SA-10-018, October 2010, http://safety.fhwa.dot.gov/tools/data_tools/mirereport/mirereport.pdf.

Table 3—MIRE Fundamental Data Elements for Unpaved Roads

MIRE name (MIRE No.) ¹
Roadway segment:
Segment Identifier (12).
Functional Class (19). ²
Type of Governmental Ownership (4). ²
Begin Point Segment Descriptor (10). ²
End Point Segment Descriptor (11). ²

¹ Model Inventory of Roadway Elements—MIRE, Version 1.0, Report No. FHWA-SA-10-018, October 2010, http://safety.fhwa.dot.gov/tools/data_tools/mirereport/mirereport.pdf.

authority: 23 U.S.C. 104(b)(3), 130, 148, 150, and 315; 49 CFR 1.85

source: 81 FR 13739, Mar. 15, 2016, unless otherwise noted.

cite as: 23 CFR 924.17