U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000


Skip to content
FacebookYouTubeTwitterFlickrLinkedIn

Safety

eSubscribe
eSubscribe Envelope

FHWA Home / Safety / Tools and Technology

Model Inventory of Roadway Elements – MIRE, Version 1.0

MIRE Elements

This section presents a listing of the MIRE elements. The elements are broken down into three main sections: I. Roadway Segment Descriptors, II. Roadway Alignment Descriptors and III. Roadway Junction Descriptors. At the beginning of each section is a listing of the elements in that section, followed by detailed information for each element. Appendix A shows an alphabetical listing of the 202 MIRE elements.

I. Roadway Segment Descriptors

I.a. Segment Location/Linkage Elements

  1. County Name
  2. County Code
  3. Highway District
  4. Type of Governmental Ownership
  5. Specific Governmental Ownership
  6. City/Local Jurisdiction Name
  7. City/Local Jurisdiction Urban Code
  8. Route Number
  9. Route/Street Name
  10. Begin Point Segment Descriptor
  11. End point Segment Descriptor
  12. Segment Identifier
  13. Segment Length
  14. Route Signing
  15. Route Signing Qualifier
  16. Coinciding Route Indicator
  17. Coinciding Route — Minor Route Information
  18. Direction of Inventory

I.b. Segment Classification

  1. Functional Class
  2. Rural/Urban Designation
  3. Federal Aid/Route Type
  4. Access Control

I.c. Segment Cross Section

  1. Surface Type
  2. Total Paved Surface Width
  3. Surface Friction
  4. Surface Friction Date
  5. Pavement Roughness/Condition
  6. Pavement Roughness Date
  7. Pavement Condition (Present Serviceability Rating)
  8. Pavement Condition (PSR) Date
  9. Number of Through Lanes
  10. Outside Through Lane Width
  11. Inside Through Lane Width
  12. Cross Slope
  13. Auxiliary Lane Presence/Type
  14. Auxiliary Lane Length
  15. HOV Lane Presence/Types
  16. HOV Lanes
  17. Reversible Lanes
  18. Presence/Type of Bicycle Facility
  19. Width of Bicycle Facility
  20. Number of Peak Period Through Lanes
  21. Right Shoulder Type
  22. Right Shoulder Total Width
  23. Right Paved Shoulder Width
  24. Right Shoulder Rumble Strip Presence/Type
  25. Left Shoulder Type
  26. Left Shoulder Total Width
  27. Left Paved Shoulder Width
  28. Left Shoulder Rumble Strip Presence/Type
  29. Sidewalk Presence
  30. Curb Presence
  31. Curb Type
  32. Median Type
  33. Median Width
  34. Median Barrier Presence/Type
  35. Median (Inner) Paved Shoulder Width
  36. Median Shoulder Rumble Strip Presence/Type
  37. Median Sideslope
  38. Median Sideslope Width
  39. Median Crossover/Left Turn Lane Type

I.d. Segment Roadside Descriptors

  1. Roadside Clearzone Width
  2. Right Sideslope
  3. Right Sideslope Width
  4. Left Sideslope
  5. Left Sideslope Width
  6. Roadside Rating
  7. Major Commercial Driveway Count
  8. Minor Commercial Driveway Count
  9. Major Residential Driveway Count
  10. Minor Residential Driveway Count
  11. Major Industrial/Institutional Driveway Count
  12. Minor Industrial/Institutional Driveway Count
  13. Other Driveway Count

I.e. Other Segment Descriptors

  1. Terrain Type
  2. Number of Signalized Intersections in Segment
  3. Number of Stop-Controlled Intersections in Segment
  4. Number of Uncontrolled/Other Intersections in Segment

I.f. Segment Traffic Flow Data

  1. Annual Average Daily Traffic (AADT)
  2. AADT Year
  3. AADT Annual Escalation Percentage
  4. Percent Single Unit Trucks or Single Truck AADT
  5. Percent Combination Trucks or Combination Truck AADT
  6. Percentage Trucks or Truck AADT
  7. Total Daily Two-Way Pedestrian Count/Exposure
  8. Bicycle Count/Exposure
  9. Motorcycle Count or Percentage
  10. Hourly Traffic Volumes (or Peak and Offpeak AADT)
  11. K-Factor
  12. Directional Factor

I.g. Segment Traffic Operations/Control Data

  1. One/Two-Way Operations
  2. Speed Limit
  3. Truck Speed Limit
  4. Nighttime Speed Limit
  5. 85th Percentile Speed
  6. Mean Speed
  7. School Zone Indicator
  8. On-Street Parking Presence
  9. On-Street Parking Type
  10. Roadway Lighting
  11. Toll Facility
  12. Edgeline Presence/Width
  13. Centerline Presence/Width
  14. Centerline Rumble Strip Presence/Type
  15. Passing Zone Percentage

I.h. Other Supplemental Segment Descriptors

  1. Bridge Numbers for Bridges in Segment

II. Roadway Alignment Descriptors

II.a. Horizontal Curve Data

  1. Curve Identifiers and Linkage Elements
  2. Curve Feature Type
  3. Horizontal Curve Degree or Radius
  4. Horizontal Curve Length
  5. Curve Superelevation
  6. Horizontal Transition/Spiral Curve Presence
  7. Horizontal Curve Intersection/Deflection Angle
  8. Horizontal Curve Direction

II.b. Vertical Grade Data

  1. Grade Identifiers and Linkage Elements
  2. Vertical Alignment Feature Type
  3. Percent of Gradient
  4. Grade Length
  5. Vertical Curve Length

III. Roadway Junction Descriptors

III.a. At-Grade Intersection/Junctions

General Descriptors

  1. Unique Junction Identifier
  2. Type of Intersection/Junction
  3. Location Identifier for Road 1 Crossing Point
  4. Location Identifier for Road 2 Crossing Point
  5. Location Identifier for Additional Road Crossing Points
  6. Intersection/Junction Number of Legs
  7. Intersection/Junction Geometry
  8. School Zone Indicator
  9. Railroad Crossing Number
  10. Intersecting Angle
  11. Intersection/Junction Offset Distance
  12. Intersection/Junction Traffic Control
  13. Signalization Presence/Type
  14. Intersection/Junction Lighting
  15. Circular Intersection — Number of Circulatory Lanes
  16. Circular Intersection — Circulatory Lane Width
  17. Circular Intersection — Inscribed Diameter
  18. Circular Intersection — Bicycle Facility

Approach Descriptors (Each Approach)

  1. Intersection Identifier for this Approach
  2. Unique Approach Identifier
  3. Approach AADT
  4. Approach AADT Year
  5. Approach Mode
  6. Approach Directional Flow
  7. Number of Approach Through Lanes
  8. Left Turn Lane Type
  9. Number of Exclusive Left Turn Lanes
  10. Amount of Left Turn Lane Offset
  11. Right Turn Channelization
  12. Traffic Control of Exclusive Right Turn Lanes
  13. Number of Exclusive Right Turn Lanes
  14. Length of Exclusive Left Turn Lanes
  15. Length of Exclusive Right Turn Lanes
  16. Median Type at Intersection
  17. Approach Traffic Control
  18. Approach Left Turn Protection
  19. Signal Progression
  20. Crosswalk Presence/Type
  21. Pedestrian Signalization Type
  22. Pedestrian Signal Special Features
  23. Crossing Pedestrian Count/Exposure
  24. Left/Right Turn Prohibitions
  25. Right Turn-On-Red Prohibitions
  26. Left Turn Counts/Percent
  27. Year of Left Turn Counts/Percent
  28. Right Turn Counts/Percent
  29. Year of Right Turn Counts/Percent
  30. Transverse Rumble Strip Presence
  31. Circular Intersection — Entry Width
  32. Circular Intersection — Number of Entry Lanes
  33. Circular Intersection — Presence/Type of Exclusive Right Turn Lane
  34. Circular Intersection — Entry Radius
  35. Circular Intersection — Exit Width
  36. Circular Intersection — Number of Exit Lanes
  37. Circular Intersection — Exit Radius
  38. Circular Intersection — Pedestrian Facility
  39. Circular Intersection — Crosswalk Location
  40. Circular Intersection — Island Width

III.b. Interchange and Ramp Descriptors

  1. Unique Interchange Identifier
  2. Location Identifier for Road 1 Crossing Point
  3. Location Identifier for Road 2 Crossing Point
  4. Location Identifier for Additional Road Crossing Points
  5. Interchange Type
  6. Interchange Lighting
  7. Interchange Entering Volume
  8. Interchange Identifier for this Ramp
  9. Unique Ramp Identifier
  10. Ramp Length
  11. Ramp Acceleration Lane Length
  12. Ramp Deceleration Lane Length
  13. Ramp Number of Lanes
  14. Ramp AADT
  15. Year of Ramp AADT
  16. Ramp Metering
  17. Ramp Advisory Speed Limit
  18. Roadway Type at Beginning Ramp Terminal
  19. Roadway Feature at Beginning Ramp Terminal
  20. Location Identifier for Roadway at Beginning Ramp Terminal
  21. Location of Beginning Ramp Terminal Relative to Mainline Flow
  22. Roadway Type at Ending Ramp Terminal
  23. Roadway Feature at Ending Ramp Terminal
  24. Location Identifier for Roadway at Ending Ramp Terminal
  25. Location of Ending Ramp Terminal Relative to Mainline Flow
Page last modified on October 15, 2014.
Safe Roads for a Safer Future - Investment in roadway safety saves lives
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000