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                        Background Report: Guidance for Roadway Safety Data to Support the Highway Safety Improvement Program


            
            In This Section
        Safety Data Analysis & Tools
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                Appendix A: FDE/HSIP Element Data Dictionary
**FDE/HSIP Elements**
			**HPMS FE* Element****(Yes/N**o)
			**Definition**
			**Corresponding MIRE Element****(Page in MIRE Report)****Roadway Segment**Segment ID
			Yes
			Unique segment identifier.
			12. Segment Identifier (*19*)Route Name
			Yes
			Signed numeric value for the roadway segment.
			8. Route Number (*18*)Alternate Route Name
			Yes
			The route or street name, where different from route number.
			9. Route/Street Name (*18*)Route Type
			Yes
			Federal-aid/National Highway System (NHS) route type.
			21. Federal-aid/Route Type (*24*)Area Type
			Yes
			The rural or urban designation based on Census urban boundary and population.
			20. Rural/Urban Designation (*23*)Date Opened to Traffic
			No
			The date at which the site was opened to traffic.
			---Start Location
			Yes
			The location of the starting point of the roadway segment.
			10. Begin Point Segment Descriptor (*18*)End Location
			Yes
			The location of the ending point of the roadway segment.
			11. End Point Segment Descriptor (*19*)Segment Length
			Yes
			The length of the segment.
			13. Segment Length (*19*)Segment Direction
			No
			Direction of inventory if divided roads are inventoried in each direction.
			18. Direction of Inventory (*22*)Roadway Class
			Yes
			The functional class of the segment.
			19. Functional Class (*23*)Median Type
			No
			The type of median present on the segment.
			54. Median Type (*45*)Access Control
			Yes
			The degree of access control.
			22. Access Control (*25*)Two-Way vs. One-Way Operation
			Yes
			Indication of whether the segment operates as a one- or two-way roadway.
			91. One/Two-Way Operations (*64*)Number of Through Lanes
			Yes
			The total number of through lanes on the segment. This excludes turn lanes and auxiliary lanes.
			31. Number of Through Lanes (*30*)Interchange Influence Area on Mainline Freeway
			No
			The value of this item indicates whether or not a roadway is within an interchange influence area. *(This can be derived from MIRE Elements 197 & 201.)*
			197. Location Identifier for Roadway at Beginning Ramp Terminal (*136*)
			201. Location Identifier for Roadway at Ending Ramp Terminal (*139*)AADT
			Yes
			The average number of vehicles passing through a segment from both directions of the mainline route for all days of a specified year
			79. Annual Average Daily Traffic (AADT) (*60*)AADT Year
			Yes
			Year of AADT.
			80. AADT Year (*60*)**Intersection**Intersection ID
			No
			A unique junction identifier.
			120. Unique Junction Identifier (*84*)Location
			No
			Location of the center of the junction on the first intersecting route (e.g. route-milepost). *(This can be derived from MIRE Elements 122 & 123.)*
			122. Location Identifier for Road 1 Crossing Point (*85*)
			123. Location Identifier for Road 2 Crossing Point (*85*)Intersection Type
			No
			The type of geometric configuration that best describes the intersection/junction.
			126. Intersection/Junction Geometry (*87*)Traffic Control Type
			No
			Traffic control present at intersection/junction.
			131. Intersection/ Junction Traffic Control (*93*)Major Road AADT
			No
			The Annual Average Daily Traffic (AADT) on the approach leg of the intersection/junction.
			140. Approach AADT (*98*)Major Road AADT Year
			No
			The year of the Annual Average Daily Traffic (AADT) on the approach leg of the intersection/junction.
			141. Approach AADT Year (*99*)Minor Road AADT
			No
			The Annual Average Daily Traffic (AADT) on the approach leg of the intersection/junction.
			140. Approach AADT (*98*)Minor Road AADT Year
			No
			The year of the Annual Average Daily Traffic (AADT) on the approach leg of the intersection/junction.
			141. Approach AADT Year (*99*)Intersection Leg ID
			No
			A unique identifier for each approach of an intersection.
			139. Unique Approach Identifier (*98*)Leg Type
			No
			Specifies the major/minor road classification of this leg relative to the other legs in the intersection. *(This can be derived from MIRE Element 140)*.
			140. Approach AADT (*98*)Leg Segment ID
			No
			A unique identifier for the segment associated with this leg.
			---**Ramp/Interchange**Ramp ID
			Yes
			An identifier for each ramp that is part of a given interchange. This defines which ramp the following elements are describing.
			186. Unique Ramp Identifier (*129*)Date Opened to Traffic
			No
			The date at which the site was opened to traffic.
			---Start Location
			No
			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.
			197. Location Identifier for Roadway at Beginning Ramp Terminal (*136*)Ramp Type
			No
			Indicates whether the ramp is used to enter or exit a freeway, or connect two freeways. *(This can be derived from MIRE Elements 195 & 199)*.
			195. Roadway Type at Beginning Ramp Terminal (*135*)
			199. Roadway Type at Ending Ramp Terminal (*138*)Ramp/Interchange Configuration
			No
			Describes the characterization of the design of the ramp. *(This can be derived from MIRE Element 182)*.
			182. Interchange Type (*124*)Ramp Length
			No
			Length of ramp.
			187. Ramp Length (*129*)Ramp AADT
			Yes
			AADT on ramp.
			191. Ramp AADT (*133*)Ramp AADT Year
			No
			Year of AADT on ramp.
			192. Year of Ramp AADT (*133*)*Highway Performance Monitoring System full extent elements required on all Federal-aid highways and ramps located within grade separated interchanges, i.e., NHS and all functional systems excluding rural minor collectors and locals.
      
  Book traversal links for Appendix A: FDE/HSIP Element Data Dictionary
      ‹ References
                    Up
                
                Book:Background Report: Guidance for Roadway Safety Data to Support the Highway Safety Improvement Program
              Executive Summary
                Introduction
                Use of Safety Data in the HSIP
                Model Inventory of Roadway Elements
                Relational Statewide Location Referencing System
                Data Collection Costs
                Fundamental Data Elements for HSIP
                Resources on Data Collection Methodologies
                Potential Funding Sources
                Safety Tools and Methods
                Performance Measures
                Summary
                References
                Appendix A: FDE/HSIP Element Data Dictionary U.S. DEPARTMENT OF TRANSPORTATION

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