Comparison of Proposed MMIRE Elements

Introduction

• Comparison of the current proposed MMIRE elements with:– 23 State databases• HSIS States• States databases obtained through other FHWA efforts

– Other inventories/databases• HPMS, MMUCC, SafetyAnalyst, IHSDM, and HSM

– Excerpts from comparison spreadsheets (handouts)

Comparison with States

• MMIRE Total: 180 elements• 54 elements not maintained by States

• Roadway Segment Descriptors: 99 elements– 22 elements not maintained by States

• Roadway Alignment Descriptors: 13 elements– 2 elements not maintained by States

• Roadway Junction Descriptors: 68 elements– 30 elements not maintained by States

Comparison with States:Roadway Segment Descriptors

• Includes location, lane, shoulder, median, and traffic descriptors

• States collect majority of location elements • States are not collecting some median

descriptor elements• States collect majority of traffic flow data

Comparison with States:Roadway Alignment Descriptors

• Includes horizontal curve and vertical grade descriptors

• States are collecting majority of elements– Out of 8 horizontal alignment elements, States are

not collecting 2 elements• 101. Curve Feature Type• 105. Horizontal Transition/Spiral Curve Presence

– All 5 Vertical Grade elements are maintained by all of the States

Comparison with States:Roadway Junction Descriptors

• Includes at-grade intersection and interchange and ramp descriptors

• Many of the At-grade Intersection/ Junction elements are not collected – General Descriptors: States not collecting 9 out of 20

elements– At Grade Intersection/Junction Descriptors broken down

by approach: States not collecting 17 out of 29 elements • All 6 of the General Interchange Descriptors are

maintained by all of the States

Comparison with Databases

• MMIRE Total: 180 elements• 56 elements not contained in databases

• Roadway Segment Descriptors: 99 elements– 23 elements not contained in databases

• Roadway Alignment Descriptors: 13 elements– 1 element not contained in databases

• Roadway Junction Descriptors: 68 elements– 32 elements not contained in databases

Comparison with Databases:Roadway Segment Descriptors

• The majority of these elements are included in the other databases

• Databases contain majority of location elements

• Databases do not contain some median descriptor elements

• Databases contain majority of traffic flow data and traffic operations/control data

Comparison with Databases:Roadway Alignment Descriptors

• Databases include majority of elements– Out of 8 horizontal alignment elements, only 1 is

not contained in any of the databases• 101. Curve Feature Type

– All 5 Vertical Grade elements are contained in the databases

Comparison with Databases:Roadway Junction Descriptors

• Databases contain majority of General Descriptors

• At Grade Intersection/Junction Descriptors broken down by approach: Databases do not contain 15 out of 29 elements

• General Interchange Descriptors: Databases do not contain any of the 6 elements

Questions