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Federal Highway Administration Research and Technology
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Publication Number: FHWA-HRT-07-046
Date: August 2007
Model Minimum Inventory of Roadway Elements—MMIRE
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PROPOSED MMIRE ELEMENTS
The proposed listing of MMIRE elements is presented in the matrix in Appendix B. For clarity of presentation, the project team divided the listing into the following categories and subcategories. Individual elements/variables are then listed under each subheading.
As shown, the descriptors are categorized into three basic groups—roadway segment descriptors (e.g., begin and end route milepost, number of lanes, AADT), roadway segment alignment descriptors (e.g., degree of curve, percent grade), and road junction descriptors (e.g., type of junction, approach traffic volume, presence of protected left turn phasing). While most current inventory systems are divided into these three basic file types, relational databases would allow the data to be stored in alternative ways. Thus, the categorization is logic driven and used for explanation purposes rather than a prescription for file layouts.
The matrix in Appendix B includes the following information:
PROPOSED MMIRE ELEMENT CODING
Appendix C contains the proposed coding for each of the proposed MMIRE elements. The element name, definition, attributes (i.e., proposed coding), and source of coding is presented. When similar coding was found in the major sources, "All Sources" is noted. In many cases, "Project team" indicates coding for a new variable proposed by the project team. In other cases, it indicates that no coding was found for an element in the major sources, and the coding was based on the project team’s knowledge of coding in existing State inventory files.
ADDITIONAL SAFETY VARIABLES IN THE NATIONAL BRIDGE INDEX AND USDOT NATIONAL HIGHWAY-RAIL CROSSING INVENTORY
The MMIRE matrix in Appendix B includes reference to both the National Bride Index10 and the USDOT National Highway-Rail Crossing Inventory11. Both these inventories contain multiple variables, some of which are related to safety and some related to nonsafety usage (e.g., bridge strength ratings). At the request of and with the input of a State DOT workshop participant, a listing of those elements in each file that are most related to safety analyses are included for information in Appendix D.