USA Banner
  U.S. flag
              An official website of the United States government Here's how you knowOfficial US Government Icon
              **Official websites use .gov**A **.gov** website belongs to an official government organization in the United States.
            Secure Site Icon
              **Secure .gov websites use HTTPS**
                  A **lock** ( A locked padlock ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. 
 U.S. Department of Transportation Icon United States Department of Transportation
 Search DOT
            Search
                    About FHWAFHWA Organization
                Headquarters Offices
                Field Offices
                Strategic Plan
                Business Opportunities
                Staff Directories
                Careers
                Highway History
                Contact UsProgramsAcquisition Management
                Civil Rights
                Federal Lands Highway
                Infrastructure
                Innovative Program Delivery
                Operations
                Planning, Environment, and Realty
                Policy
                Research, Development, and Technology
                Safety
                Browse by TopicsResourcesCore Highway Topics
                Federal Aid Essentials
                Automation
                Complete Streets
                Laws and Regulations
                Policy & Guidance Center
                Section 508
                Publications and Statistics
                Professional Development
                National Highway Institute
                Resource Center
                Accessibility Resource Library
                FHWA Research LibraryNewsroomPress Releases
                Speeches & Testimony
                Photos
                Videos
                Media ContactsMenu FHWA Highway Safety Programs Home
                        Safety
                        Safety Data Analysis & Tools
                        MIRE & FDE


            
            In This Section
        Safety Data Analysis & Tools
                Crash Modification Factor Clearinghouse
                Roadway Safety Data Program (RSDP)
                                Overview
                Data Driven Safety Analysis
                Data Management
                Safety Data Analysis Tools
                Local Data Integration
                Technical Assistance
                Case Studies
                Training
                Resources
                Highway Safety Manual (HSM)
                Model Inventory of Roadway Elements (MIRE) and FDEs
                Systemic
                                Overview
                Why Systemic
                Training
                Resources
                Road Safety Audits
                                Overview
                Benefits
                Legal Issues
                Steps of Conduct
                Training
                Resources
      
   Related Documents
          The Model Inventory of Roadway Elements (MIRE) 2.0 Report
                                                        Model Inventory of Roadway Elements (MIRE) Fundamental Data Elements (FDE) Questions & Answers
                                                        Guidance on State Safety Data Systems
      
      
      
        Contact Us
      Sarah Weissman Pascual
      
                    
            Roadway Safety Data Program
      
                    
            Office of Safety Programs
      
                
    **Email:**sarah.pascual@dot.gov
    If you are deaf, hard of hearing, or have a speech disability, please dial 7-1-1 to access telecommunications relay services.
                
                Model Inventory of Roadway Elements (MIRE)
MIRE is a recommended listing of roadway characteristic and traffic inventory elements critical to safety management. MIRE is a guide to help transportation agencies improve their roadway and traffic data inventories. It was developed to support a State's advanced safety analyses such as presented in the Highway Safety Manual.

About MIRE

Safe Systems Start with Quality Data

Good data and effective analysis are key to making sound decisions on the safety, design, and operation of roadways. MIRE provides a comprehensive list of roadway and traffic data elements and accompanying data dictionary that serves as a robust inventory model to support data-driven safety decision making.

The 2012 Moving Ahead for Progress in the 21st Century Act (MAP-21) legislation called for **improved and more robust safety data** for **better safety analysis**to support the development of States’ Strategic Highway Safety Plans (SHSPs) and Highway Safety Improvement Programs (HSIPs). The Fixing America’s Surface Transportation Act (FAST Act), signed in 2015, continued the State safety data system requirements established in MAP-21.

MIRE is a recommended guideline of data elements that States could collect to develop a comprehensive safety data system (crash, roadway, and traffic data).MIRE helps States meet the data requirements common among analytical tools, including:

Highway Safety Manual (HSM).
	AASHTOWare Safety (formerly Safety AnalystTM).
	Interactive Highway Safety Design Model (IHSDM).
	AASHTO's NCHRP Series 500 Data and Analysis Guide.

MIRE 2.0

FHWA published the initial MIRE Report in 2007 and released MIRE 1.0 with more than 200 elements in 2010. In 2018, FHWA released MIRE 2.0 as a refinement.

​Since the release of MIRE 1.0 in 2010, safety analysis techniques have advanced, and both the safety and data communities have developed an increased awareness of the importance of good quality data in safety analysis. Additionally, new Federal requirements for data have been issued, including the MIRE Fundamental Data Elements (FDE) and the Highway Performance Monitoring System (HPMS) All Road Network of Linear Referenced Data (ARNOLD). For example, the HPMS ARNOLD requirement expanded States’ obligation to include all public roads into their linear referencing system (LRS) base map. This LRS requirement provides at least one means to locate MIRE data elements geospatially.

In response to these changes, FHWA initiated a reassessment of MIRE 1.0 that resulted in MIRE 2.0. The MIRE 2.0 update includes a revised format to reflect:

The transition from isolated datasets to enterprise database environments among agencies;
	Alignment with other Federal datasets and requirements across FHWA; and
	Updates to operational and design elements that have become more widely implemented.MIRE 2.0 also serves as a resource for meeting the above Federal safety data requirements.



MIRE Fundamental Data Elements

MAP-21 and the FAST Act required the Secretary to establish a subset of the MIRE that are useful for the inventory of roadway safety and ensure that States adopt and use the subset to improve data collection. [23 U.S.C. 148(f)(2)]. FHWA established a subset of the MIRE as part of the HSIP Final Rule changes to 23 CFR Part 924, effective April 14, 2016. This MIRE subset is referred to as the **fundamental data elements** (FDEs).

The FDEs are categorized by roadway functional classification and pavement type (non-local paved, local paved and unpaved roads). They are further refined into subcategories of data elements for roadway segments, intersections, and interchanges. The MIRE FDE provide enough data to enable jurisdictions to analyze crash experience on their roadway networks relative to the expected average crash frequency given the roadway and traffic characteristics at each location.

FHWA tiered the required FDEs for each category:

Road Category
			Number of Required MIRE-
			FDE Elements**Non-local Paved Roads**

			*Functional classifications 1-6*
			**37****Local Paved Roads**

			*Functional classification 7*
			**9****Unpaved Roads**

			*Any functional classification*
			**5**

Non-Local Paved Roads

*Note AADT = Annual Average daily Traffic*

Roadway SegmentAADT
			Federal Aid/Route Type
			Route NumberAADT Year
			Functional Class
			Rural/Urban DesignationAccess Control
			Median Type
			Segment IdentifierBegin Point Segment Descriptor
			Number of Through Lanes
			Segment LengthEnd Point Segment Descriptor
			One/Two-Way Operations
			Surface TypeDirection of Inventory
			Route/Street Name
			Type of Governmental OwnershipIntersectionAADT [for each intersecting road]
			Intersection/Junction Traffic Control
			Unique Approach IdentifierAADT Year [for each intersecting road]
			Location Identifier for Road 1 Crossing Point
			Unique Junction IdentifierIntersection/Junction Geometry
			Location Identifier for Road 2 Crossing PointInterchange/RampFunctional Class
			Ramp AADT
			Type of Governmental OwnershipInterchange Type
			Ramp Length
			Unique Interchange IdentifierLocation Identifier for Roadway Beginning Ramp Terminal
			Roadway Type at Beginning Ramp Terminal
			Year of Ramp AADTLocation Identifier for Roadway Ending Ramp Terminal
			Roadway Type at Ending Ramp Terminal

Local Paved Roads

Roadway SegmentAnnual Average Daily Traffic
			Functional Class
			Segment IdentifierBegin Point Segment Descriptor
			Number of Through Lanes
			Surface TypeEnd Point Segment Descriptor
			Rural/Urban Designation
			Type of Governmental Ownership

Unpaved Roads

Roadway SegmentBegin Point Segment Descriptor
			Functional Class
			Type of Governmental OwnershipEnd Point Segment Descriptor
			Segment Identifier

Resources

**MIRE & MIRE 2.0**

Model Inventory of Roadway Elements - MIRE 2.0
	MIRE Data Collection Guidebook
	Performance Measures for Roadway Inventory Data
	Model Performance Measures for State Traffic Records Systems
	Development of a Structure for a MIRE Management Information System**MIRE FDE**

MIRE FDE Graphic
	Guidance on State Safety Data Systems.
	Background Report: Guidance for Roadway Safety Data to Support the Highway Safety Improvement Program.
	MIRE and MIRE FDE Technical Assistance: Final Report**Tools**

AASHTOWare Safety.
	FHWA Interactive Highway Safety Design Model (IHSDM).
	Highway Safety Manual.
	Roadway Data Extraction Tool User Guide.
	Roadway Data Extraction Tool Implementation and Programming Guide**Databases**

FHWA Highway Performance Monitoring System.
	Highway Safety Information System (HSIS).**Scan Reports**

Traffic Safety Information Systems in Europe and Australia.
	Traffic Safety Information Systems International Scan: Strategy Implementation White Paper.**Other Resources**

Model Minimum Uniform Crash Criteria (MMUCC).
	FHWA Office of Asset Management.
	USDOT Traffic Records Coordinating Committee.
	Association of Transportation Safety Information Professionals (ATSIP).ARCHIVE Resources

Model Inventory of Roadway Elements - MIRE 1.0
	Model Minimum Inventory of Roadway Elements (MMIRE)
	MIRE MIS Lead Agency Data Collection Report
	MIRE Element Collection Mechanisms and Gap Analysis
	The Exploration of the Application of Collective Information to Transportation Data for Safety

Contact Us

Dr. Carol Tan
Federal Highway Administration
Office of Safety Research and Developmentcarol.tan@dot.gov

Sarah Weissman Pascual
Federal Highway Administration
Office of Safety Programssarah.pascual@dot.gov

back to top U.S. DEPARTMENT OF TRANSPORTATION

**Federal Highway Administration**

1200 NEW JERSEY AVENUE, SE

WASHINGTON, DC 20590

202-366-4000Subscribe to email updates
                    About
  

        
              About FHWA
                Careers
                Org Chart
                Staff Directories
                Work with UsPrograms
  

        
              Acquisition Management
                Civil Rights
                Federal Lands Highway
                Infrastructure
                Innovative Program Delivery
                Operations
                Planning, Environment, and Realty
                Policy
                Research, Development, and Technology
                SafetyPolicies, Rights, Legal
  

        
              About DOT
                Accessibility
                Budget and Performance
                Civil Rights
                FOIA
                Information Quality
                No FEAR Act
                Office of Inspector General
                Privacy Policy
                USA.gov
                Web Policies and Notices
                Web StandardsNews & Events
  

        
              Newsroom
                Press Releases
                Speeches & Testimony
                Media Contacts
                Connect with Us