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Publication Number: FHWA-HRT-07-046
Date: August 2007

Model Minimum Inventory of Roadway Elements—MMIRE

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APPENDIX D. PRIORITY SAFETY VARIABLES IN THE NATIONAL BRIDGE INDEX AND THE USDOT NATIONAL HIGHWAY-RAIL CROSSING INVENTORY

Table 2. High priority safety variables in the National Bridge Inventory.
FIELD_NAMEDESCRIPTION
STATE State Code
STRUCNUM Structure Number
RTSIGPRF Route Signing Prefix
RTNUM Route Number
DIRSUFF Directional Suffix
HWYAGNCY Highway Agency District
CNTY County (Parish) Code
PLACE Place Code
FEATURE Features Intersected
STRCTURE Facility Carried by Structure
LOCATION Location
INVRTE Inventory Rte, Min Vert
Clearance
MILEPT Mile point
KMPT Numeric Kilometerpoint
BASEHWY Base Highway Network
LRSNVRTE LRS Inventory Route
SUBRTNUM Subroute Number
LATITUDE Latitude
LONGTUDE Longitude
FUNCLASS Functional Class of Inventory
Rte.
LANESON Lanes on Structure
LANESUN Lanes Under Structure
AVGDAY Average Daily Traffic
AVDAYNO Num. Field—Avg. Daily Traf.
YRAVG Year of Average Daily Traffic
APPROW Approach Roadway Width
APPRDNO Num. Field for APPROW
BRIMED Bridge Median
SKEW Skew
RAIL Bridge Railings
TRANSIT Transitions
APPGUARD Approach Guardrail
GUARDEND Approach Guardrail Ends
STRCSTAT Structure Open/Posted/Closed
ONSERVE Type of Service on Bridge
UNDSERVE Type of Service Under Bridge
TOTHORCL Inventory Rte Total Horz
Clearance
TOTHORNO Numeric Conversion for
TOTHORCL
STRLENGT Structure Length
STRLNGNO Numeric Conversion for
STRLENGT
LEFTWALK Left Curb/Sidewalk Width
LFTWLKNO Numeric conversion for
LEFTWALK
RITEWALK Right Curb/Sidewalk Width
RTWALKNO Numeric Conversion for
RITEWALK
ROADWID Bridge Roadway Width Curb-to-
Curb
RDWIDNO Numeric Conversion for
ROADWID
MINVERTO Min Vert Clear Over Bridge
Roadway
MVCONO Numeric Conversion for
MINVERTO
MINVERTU Minimum Vertical
Underclearance
MVCUNO Numeric Conversion for
MINVERTU
MINLATU Minimum Lateral
Underclearance
MLCURNO Numeric Conversion for
MINLATU
MINLATL Min Lateral Underclear on Left
MLCULNO Numeric Conversion for
MINLATL
RDALIGN Approach Roadway Alignment
STRAHWY STRAHNET Highway
Designation
DIRTRAF Direction of Traffic
HIGHINV Highway System of Inventory
Route
FEDLNDHY Federal Lands Highways
AVTRAFF Average Daily Truck Traffic
AVTRAFNO Numeric Conversion for
AVTRAFNO
DESNET Designated National Network
PIERPRO Pier/Abutment Protection
NBISLENG NBIS Bridge Length

Table 3. High-priority safety variables in the USDOT National Highway Rail Crossing Inventory.

Crossing Identification
Crossing Number
Effective Date
Part I: Location and Classification
Information
State
County
City (In or Near)
Street or Road Name
Highway Type & Number
Crossing Type
Crossing Position
Latitude (Decimal)
Longitude (Decimal)
Part II: Railroad Information
Typical Total No. of Daily Trains
Total Switching Trains
Total Daylight Thru Trains (6 AM to 6
PM)
Check if Less Than One Movement Per
Day
Typical Speed Range of Trains Over
Crossing
Type and Number Tracks
Part III: Traffic Control Device
Information
No Signs or Signals
Type of Warning Device at Crossing -
Signs
Crossbucks
Highway Stop Signs (R1-1)
RR Advance Warning Signs (W10-1)
Hump Crossing Sign (W10-5)
Pavement Markings
Other Signs
Gates
Four-quadrant (or Full Barrier) Gates
Cantilevered (or Bridged) Flashing
Lights
Mast Mounted Flashing Lights
Number of Flashing Light
Other Flashing Lights
Highway Traffic Signals
Wigwags
Bells
Other Train Activated Warning Devices
Specify Special Warning Device NOT
Train Activated
Channelization Devices With Gates
Traffic Light
Interconnection/Preemption
Part IV: Physical Characteristics
Smallest Crossing Angle
Number of Traffic Lanes Crossing
Railroad
Are Truck Pullout Lanes Present?
Is Highway Paved?
Crossing Surface (on Main Line)
Does Track Run Down a Street?
Nearby Intersecting Highway?
Is It Signalized?
Is Crossing Illuminated?
Part V: Highway Information
Highway System
Is Crossing on State Highway System?
Functional Classification of Road at
Crossing
Posted Highway Speed
Annual Average Daily Traffic (AADT)
Estimated Percent Trucks
Average Number of School Buses Over
Crossing per School Day

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