Skip to contentUnited States Department of Transportation - Federal Highway Administration FHWA Home
Research Home
Report
This report is an archived publication and may contain dated technical, contact, and link information
Publication Number: FHWA-HRT-07-046
Date: August 2007

Model Minimum Inventory of Roadway Elements—MMIRE

PDF Version (1.09 MB)

PDF files can be viewed with the Acrobat® Reader®

APPENDIX B. PROPOSED MMIRE ELEMENTS

Generic Variable
Description
Definition MMIRE
Priority12
Ease of
Data
Collection
13
HPMS superscript 14 IHSDM superscript 15 SafetyAnalyst superscript 16 TSIMS superscript 17 MM/JCC
I. ROADWAY SEGMENT DESCRIPTORS
I.a. Segment Location/Linkage Variables
1. County18 County location of segment 1 E     M B  
2. City/Local Jurisdiction City/local jurisdiction location of segment if
applicable
1 E U   O M  
3. Route Number Route number 1 E U Y M M  
4. Street Name Street Name 1 E          
5. Section End-Points Descriptors Location information defining the location on a
route of each endpoint of the section
1 E U Y M E  
6. Section Identifier Unique segment identifier, derived from other
variables (e.g., combination of route number,
county location and beginning and ending
mileposts
1 E U   M E  
7. Section Length Section Length 1 E U Y M    
8. Highway District Highway District 1 E     O    
9. Governmental Ownership Governmental owner of segment (including
FIPS code)
1 E U        
10. Type of Governmental
Ownership
Type of governmental ownership 1            
11. Route Signing Type of route signing on the segment 1 E U   M M  
12. Route Signing Qualifier Whether the route is "business" or other
qualifier
1 E U        
13. Coinciding Route Indicator Whether the route segment is a "primary"
coinciding route (i.e., the route that crashes are
referenced to) or a "minor" coinciding route
1 E          
14. Coinciding-Route Primary
Route Number
If a minor coinciding route segment, the route
number for the major (primary) route
1 E          
15. Direction of Inventory Direction of Inventory 1 E          
I.b. Segment Roadway Classification
16. Functional Class Functional class 1 E U   M M YES
17. Rural/Urban Designation Rural/Urban Designation 1 E U Y M B  
18. Federal Aid/ Route Type Federal Aid/ Route Type 1 E U     E  
19. Access Control Access Control 1 E S   O M YES
20. Operational Class Operational class of segment, if different from
official functional class
2 D          
I.c. Segment Cross Section
I.c.1. Surface Descriptors
21. Surface Type Surface type (paved, unpaved or types of
pavement)
1 E S Y      
22. Surface Friction Surface friction indicator 1 D          
23. Surface Friction Date Date surface friction measured 1            
24. Total Surface Width Total paved surface width (could be derived if
all other lane widths are captured)
2 M       B  
25. Pavement Roughness Pavement roughness (roughness number) 2 D U     E  
26. Pavement Roughness Date Date pavement roughness number assigned 2            
27. Pavement Condition Pavement condition (descriptive scale) 2 D S     M  
28. Pavement Condition Date Date pavement condition assigned 2            
I.c.2. Lane Descriptors
29. No. of Thru Lanes Number of thru lanes, including HOV and
reversible lanes
1 E U Y M M YES
30. Average Thru Lane Width Average lane width used by traffic (i.e., not
including wide curb lanes, parking area, bicycle
lanes, etc.)
1 M S Y M O YES
31. Exclusive Left Turn Lane
Presence
Exclusive left turn lane type 1 E          
32. Exclusive Left Turn Lane
Length
Exclusive left turn lane length 1 E          
33. Exclusive Right Turn Lane
Presence
Exclusive right turn lane type 1 E          
34. Exclusive Right Turn Lane
Length
Exclusive right turn lane length 1 E          
35. Auxiliary Lane Presence/Type Presence or type of auxiliary lane 1 E          
36. Auxiliary Lane Length Length of auxiliary lane 1 E          
37. HOV Lanes Presence of HOV lanes in segment 1 M U   M/O    
38. HOV Lane Types HOV lane types 2 E          
39. Reversible Lanes Number of reversible lanes present on
segment
1            
40. Presence/Type of Bicycle
Facility
Presence or type of bicycle facility on segment 1 D       B YES
41. Width of Marked Bicycle Lane
or Bike Path
Width of marked bicycle lane or bike path 1 D          
42. Width of Wide Curb Lane Width of wide curb lane used by both vehicles
and bicycles
1 M          
43. Number of Peak Hour Lanes Number of through lanes used in peak period
in the peak direction
2 M U        
I.c.3. Shoulder Descriptors
44. Right Shoulder Type Shoulder type on right side of road in direction
of inventory
1 E S Y M M  
45. Right Shoulder Total Width Total width of right shoulder, including paved
and unpaved parts
1 M   Y O B YES
46. Right Paved Shoulder Width Width of paved portion of right shoulder 1 E S Y O B YES
47. Left Shoulder Type Shoulder type on left side of roadway in
direction of inventory. For undivided roads and
divided roads with one direction of inventory,
this will be the outside shoulder on the
opposing side. NOTE that information on
paved width of the inner (left) shoulder on
divided roads is captured in the Median
descriptors.
1 E S Y M M  
48. Left Shoulder Total Width Width of left (outside) shoulder, including
paved and unpaved parts
1 M   Y O B YES
49. Left Paved Shoulder Width Width of paved portion of left shoulder 1 E S Y O B YES
50. Shoulder Rumble Strip
Presence
Presence of shoulder rumble strip 1 M     S    
51. Rumble Strip Type Rumble strip type if present 2 M          
52. Sidewalk Presence Presence of sidewalk in direction of inventory 1 D*       B  
53. Curb Presence Presence of curb 1 M       B  
54. Curb Type Curb type 2 D          
I.c.4. Median Descriptors
55. Median Type Median type (including two-way left turn lane) 1 E S   M M  
56. Median Width Median width, including inside shoulders 1 E S   O M YES
57. Median Barrier Type Median barrier type 1 E     M    
58. Median (Inner) Paved Shoulder Width Median (inner) paved shoulder width 1 E          
59. Median Shoulder Rumble Strip
Presence
Width of left (outside) shoulder, including
paved and unpaved parts
1 M          
60. Median Rumble Strip Type Rumble strip type if present 2 M          
61. Median Left Turn Lane Type Type of left turn lane in median. 1 E          
62. Median Left Turn Lane Width Width of median left turn lane 1 E          
I.d. Segment Roadside Descriptors
63. Roadside Clearzone Width Roadside clearzone width 1 D*          
64. Sideslope Sideslope 1 D*          
65. Roadside Rating A rating of the safety of the roadside from
Appendix D, Publication No. FHWA-RD-99-
207, Prediction of the Expected Safety
Performance of Rural Two-Lane Highways.
Only collect if clearzone width and sideslope
are not collected.
1(only if
clearzone and
sideslope
variables are
not collected)
D   Y      
66. Driveway Information Driveway count by type 1 D*   Y      
67. Roadside Hardware
Descriptors
Roadside hardware descriptors (including type,
location, size, distance from lane edge).
Examples include barrier (type and terminal
type), signs (size, breakaway?), culverts, etc.
2 (Linkage to
Asset
Management
?)
D*          
I.e. Other Segment Descriptors
68. Terrain Type (e.g.,
Mountainous, Level)
Basic terrain type around segment. This is a
(poor) surrogate for detailed data on curvature
and grade, and would be collected only in the
absence of those variables. See “Alignment”
variables below.
1 M S   O B  
69. Bridge Descriptors for Bridges
in Segment
Bridge descriptors for bridges in segment Linkage to
Bridge File
E          
70. RR Grade Crossing
Descriptors for Crossings in
Segment
RR grade crossing descriptors for crossings in
segment
Linkage to RR
File
E          
71. Number of Signalized
Intersections in Section
Number of signalized intersections in section 1 (only if no
intersection
file)
M* S        
72. Number of Stop-Controlled
Intersections in Section
Number of stop-controlled intersections in
section
1 (only if no
intersection
file)
M* S        
73. Number of Uncontrolled/Other
Intersections
Number of uncontrolled/other intersections 1 (only if no
intersection
file)
M* S        
1.f. Segment Traffic Flow Data
74. Average Daily Traffic Volume Average Annual Daily Traffic 1 E U Y M M YES
75. AADT Year Year of AADT 2 (if annual
file)
E   Y   M YES
76. AADT Annual Escalation
Percentage
AADT annual escalation percentage 2 (if annual
file)
M   O O B  
77. Percentage Truck or Truck
AADT
Percentage truck or truck AADT (includes
tractor-semis and trucks with 6+ wheels)
1 M S   O E  
78. Total Daily Two-Way
Pedestrian Count/Exposure
Total daily pedestrian flow in both directions
(unless directional segment). This is a (poor)
surrogate for crossing pedestrian counts.
2 (Collect only
if crossing
counts are
unavailable
for
intersection/
junction
approaches.
see below)
D          
79. Bicycle Count/Exposure Total daily bicycle flow in both directions
(unless directional segment)
1 D     S    
80. Motorcycle Count or
Percentage
Motorcycle daily count or percentage of AADT 1 D          
81. Hourly Traffic Volumes (or
Peak and Off-Peak AADT)
Hourly traffic volumes (or peak and off-peak
AADT)
2 D     O    
82. K-Factor The K-factor is the 30th highest hourly volume
(i.e., the design hour volume) for a year, as a
percentage of the annual average daily traffic
2 D S     B  
83. Future AADT Forecasted AADT 2 D U O   B  
84. Future AADT Year Year of forecasted AADT 2 D U O   B  
85. Directional Factor Proportion of peak hour traffic in the
predominate direction of flow
2 D S   O    
86. Percent Combination Trucks -
Daily Average
Percent combination trucks—daily average 2 M S     E  
87. Percent Single Unit Trucks -
Daily Average
Percent single unit trucks—daily average 2 M S     E  
1.f. Segment Traffic Flow Data
88. One/Two-Way Operations Whether the segment operates as a one- or
two-way roadway
1 E U   M    
89. Speed Limit Speed Limit 1 E U   O M  
90. School Zone Indicator Whether segment contains a school zone 1 M          
91. On-Street Parking Presence Time-based parking restrictions 1 D     S M  
92. On-Street Parking Type On-street parking type 1 D S        
93. Roadway Lighting Type of roadway lighting 1 M     S B YES
94. Truck Route Designation Truck route designation 1 E U        
95. Toll Facility? Toll facility indicator 1 E U        
96. Edgeline Presence/Type Edgeline presence/type 1 D*          
97. Centerline Presence/Type Centerline presence/type 1 D*          
98. No Passing Zone Code /
Passing Permissibility
No passing zone code/passing permissibility 2 D* S        
99. 85th % Speed Traffic speed exceeded by 15 percent of the
vehicles in the flow
2 D     S    
II. Roadway Alignment Descriptors
II.a. Horizontal Curve Data
(NOTE: Each data record will define an angle point or a single curve, even if the curve is a component of a compound or reverse curve. Spirals or other transitions are part of the curve.)
100. Curve Identifiers and
Linkage Variables
All variables needed to define location of each
curve record and all variables necessary to link
with other safety files
1 D*   Y      
101. Curve Feature Type Type of horizontal alignment feature being
described in the data record
1 D*          
102. Horizontal Curve Degree or
Radius
Degree or radius of curve 1 D* S Y S   YES
103. Horizontal Curve Length
(Including Spiral)
Length of curve 1 D* S Y S E YES
104. Curve Superelevation or
Superelevation Adequacy
Either measured superelevation rate or percent
or adequacy of superelevation when compared
to AASHTO design standards
2 D*   Y     YES
105. Horizontal Transition/Spiral
Curve Presence
Presence/type of transition from tangent to
curve
1 D   Y      
106. Horizontal Curve
Intersection/Deflection Angle
The angle between the two intersecting
tangents in the direction of inventory
(sometimes called the "deflection angle")
2 D          
107. Horizontal Curve Direction Direction of curve in direction of inventory 1 M*   Y S    
II.b. Vertical Grade Data
(NOTE: Each data record will define an individual grade or the angle point or vertical curve linking two grades.)
108. Grade Identifiers and
Linkage Variables
All variables needed to define location of each
vertical feature and all variables necessary to
link with other safety files
1 E          
109. Vertical Alignment Feature
Type
Type of vertical alignment feature being
described in the data record
1 E          
110. Percent of Gradient Percent of Gradient 1 D*   Y S E YES
111. Grade Length Grade Length 1 D* S Y      
112. Vertical Curve Length Vertical Curve Length 1 D          
III. Roadway Junction Descriptors
III.a. At-Grade Intersection/Junctions
(NOTE: These junctions can include both normal "intersections" and also junctions of roadways with independent pedestrian
crossings, bike trails, railroad grade crossings, etc. Thus, the category includes what has been considered "mid-block" crossings.)
III.a.1. General Descriptors
113. Unique Intersection Identifier A numeric unique identifier for each
intersection/junction
1 E          
114. Type of Intersection/Junction Type of junction being described in the data
record
1 E          
115. Location Identifier for Road 1
Crossing Point
Location on the first intersecting route (e.g.,
route-milepost)
1 M   Y   B  
116. Location Identifier for Road 2
Crossing Point
Location on the second intersecting route (e.g.,
route-milepost)
1 D (unless spatial data system)          
117. Location Identifier for Road
3, 4, etc., Crossing Point
(e.g., Route-Milepost), etc.
Location on the third and subsequent
intersecting route (e.g., route-milepost)
1 D (unless spatial data system)   Y      
118. Intersection/Junction No. of
Legs
Intersection/junction no. of legs 1 M   Y M    
119. Intersection/Junction
Geometry
Intersection/junction geometry 1 E   Y M    
120. School Zone Indicator Whether the intersection/junction is in a school
zone
1 E          
121. Railroad Crossing Number if
a RR Grade Crossing
Railroad crossing number if a RR grade
crossing (for linkage to National Highway-Rail
Crossing Inventory)
1 M          
122. Intersection Skew Angle Angle from perpendicular of intersection of the
roads
1 D   Y S    
123. Intersection/Junction Offset Whether crossroad approach centerlines are
directly opposed or offset by some distance
1 D     O E  
124. Intersection/Junction Offset
Distance
Distance that approach centerlines are offset
1 D     O M  
125. Intersection/Junction Traffic
Control
Traffic control present at intersection/junction 1 M   Y M   YES
126. Signalization Type (e.g.,
Actuated, Fixed, System)
Type of signalization at intersection/junction 2 M     S    
127. Number of
Intersection/Junction
Quadrants With Limited
Sight Distance
Number of intersection/junction quadrants with
limited sight distance
1 D   Y   B  
128. Intersection/Junction Lighting Type of lighting at intersection/junction 1 M          
129. Roundabout - No. of
Circulatory Lanes
No. of circulatory lanes in roundabout 1 E          
130. Roundabout - Circulatory
Width
Width of the roadway between the central
island and outer edge of the circulatory lane
1 E          
131. Roundabout—Inscribed
Diameter
Distance between the outer edges of the
circulatory roadway
1 M          
132. Roundabout—Bicycle
Facility
Type of bicycle facility at roundabout 1 E            
III.a.2. At Grade Intersection/Junction Descriptors—Each Approach
133. Approach AADT AADT on approach described 1 E (if system road), M (if nonsystem crossroad)         YES
134. Approach Use Type Usage of approach 1 E          
135. Approach Is Two-Way, One-
Way
One-way or two-way flow on approach 1 E     M    
136. No. of Thru Lanes Total number of thru lanes on approach, both directions 1 E          
137. No. of Exclusive Left Turn
Lanes
Number of exclusive left turn lanes on approach 1 M   Y M M  
138. No. of Exclusive Right Turn
Lanes
Number of exclusive right turn lanes on approach 1 M   Y M    
139. Length of Exclusive Left Turn
Lanes
Length of exclusive left turn lanes 2 M          
140. Length of Exclusive Right
Turn Lanes
Length of exclusive right turn lanes 2 M          
141. Median Type at Intersection Median type at intersection on approach 1 M     M    
142. Approach Traffic Control Traffic control present on approach 1 M          
143. Left Turn Protection Presence and time of left turn protection 1 D     O    
144. Signal Progression Signal progression on approach 1 D     S E  
145. Crosswalk Presence/Type Type of crosswalk 1 D          
146. Pedestrian Signalization
Type
Type of pedestrian signalization on approach 1 M       B  
147. Pedestrian Signal Special
Features
Special features for either pushbutton or recall pedestrian signals 2 M          
148. Crossing Pedestrian
Count/Exposure
Count or estimate of average daily pedestrian flow crossing this approach (Note: only applicable to approaches with vehicular traffic.) 1 D     S    
149. Left/Right Turn Prohibitions Left or right turn prohibitions on this approach 1 D     O    
150. Left Turn Counts/Percent Count or estimate of average daily left turns, or percent of total approach traffic turning left (Note: This could also be captured for peak-periods only or by hour of day.) 2 D     O    
151. Right Turn Counts/Percent Count or estimate of average daily right turns, or percent of total approach traffic turning right (Note: This could also be captured for peak-periods only or by hour of day.)     O    
152. Transverse Rumble Strip
Presence
Presence of transverse rumble strip on approach 2 D          
153. Roundabout—Entry Width Full width of entry where it meets the inscribed circle. Note that total width of the approach can be derived from totaling entry width, exit width and splitter island width. 1 E          
154. Roundabout—Number of
Entry Lanes
Number of entry lanes into roundabout on this approach 1 E          
155. Roundabout—Entry Radius Minimum radius of curvature of the curb on the right side of the entry 2 D          
156. Roundabout—Exit Width Full width of exit where it meets the inscribed circle. Note that total width of the approach can be derived from totaling entry width, exit width and splitter island width. 1 E          
157. Roundabout—Number of
Exit Lanes
Number of exit lanes from roundabout on this approach leg 1 E          
158. Roundabout—Exit Radius Minimum radius of curvature of the curb on the right side of the exit 2 D          
159. Roundabout—Pedestrian
Facility
Type of pedestrian crossing facility on this approach to roundabout 1 E          
160. Roundabout—Crosswalk
Location (Distance From
Yield Line)
Location of marked pedestrian crosswalk relative to yield line 1 E          
161. Roundabout—Splitter Island
Width
Width of the splitter island separating entry and exit legs (measured at the inscribed circle) 1 E          
III.b. Interchange and Ramp Descriptors
III.b.1. General Interchange Descriptors
162. Unique Interchange Identifier A numeric unique identifier for each interchange 1 E          
163. Location Identifier for Road 1
Crossing Point
Location on the first intersecting route (e.g., route-milepost) 1 M          
164. Location Identifier for Road 2
Crossing Point
Location on the second intersecting route (e.g., route-milepost) 1 D (unless spatial data system)              
165. Location Identifier for Road
3, 4, etc., Crossing Point,
etc.
Location on the third and subsequent intersecting route (e.g., route-milepost) 1 D (unless spatial data system)          
166. Interchange Type Type of interchange 1 M     M    
167. Interchange Lighting Type of interchange lighting 1 M          
III.b.1. General Interchange Descriptors
168. Unique Ramp Identifier An identifier for each ramp that is part of a given interchange 1 E          
169. Ramp Length Length of ramp 1 M     O M  
170. Ramp No. of Lanes Number of lanes on ramp 1 M     O E  
171. Ramp AADT AADT on ramp 1 M          
172. Ramp Posted Speed Limit The posted (not advisory) speed limit on the ramp              
173. Feature at Beginning Ramp
Terminal
A ramp is described by a beginning and ending ramp terminal in the direction of inventory. This variable describes the type of feature intersecting with the ramp at the beginning terminal. 1 E          
174. Ramp Descriptor at
Beginning Ramp Terminal
Description of the beginning terminal of the ramp 1 M     M    
175. Location Identifier For
Roadway at Beginning Ramp
Terminal
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. 1 E (if begin point is on a system roadway)          
176. Roadway Traffic Flow
Direction at Beginning Ramp
Terminal
Ramps can intersect a roadway on either of two sides. This defines the side of the road intersected by the ramp. 1 E          
177. Feature at Ending Ramp
Terminal
A ramp is described by a beginning and ending ramp terminal in the direction of inventory. This variable describes the type of feature intersecting with the ramp at the ending terminal. 1 E          
178. Ramp Descriptor at Ending
Ramp Terminal
Description of the ending terminal of the ramp 1 M     M    
179. Location Identifier for
Roadway at Ending Ramp
Terminal
Location on the roadway at the ending ramp terminal (e.g., route-milepost for that roadway) if the ramp connects with a roadway at that point 1 E (if end point is on a system roadway)          
180. Roadway Traffic Flow
Direction at Ending Ramp
Terminal
Ramps can intersect a roadway on either of two sides.  This defines the side of the road intersected by the ramp. 1 E          

Previous | Table of Contents | Next

ResearchFHWA
FHWA
United States Department of Transportation - Federal Highway Administration