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Ohio DOT - NLF ID Naming Structure

This article breaks down the naming convention Ohio DOT has used for NLF ID fields in Numetric.

Lauren Miller avatar
Written by Lauren Miller
Updated this week

NLF ID stands for Network Linear Feature Identifier. This value uniquely identifies a route within a county. It is a 14-character field based on a composition of several values defined as follows:

Jurisdiction: Character 1 – A single letter code indicating the primary legal authority by which records are grouped.

  • S – State

  • C – County

  • T – Township

  • M – Municipal

  • F – Federal

  • P – Private

County: characters 2..4 – Standard ODOT three-letter abbreviation of Ohio’s county names. Examples include: ADA-Adams and FRA-Franklin.

Route System: characters 5..6 – Two-letter code indicating the basic transportation network group. This field is also often known as the “transportation route code.”

  • IR – Interstate

  • US - United States Route

  • SR - State Route

  • CR - County Road

  • TR - Township Road

  • MR - Municipal Street

  • RA – Ramp

  • NR – Natural Resources Road (Park Road)

  • FR – Forest Road

  • BK - Bike Route

  • RE – Rest Area Entry/Exit

  • WS – Weigh Station Entry/Exit

  • RR – Railroad Track

Route Number: characters 7..11 – The number assigned to a particular route. Note that in the case where the route is less than 5 characters, the left side is zero-filled. Examples include: 00670, 00002, and 00071. For legacy purposes in the Road Inventory databases, all private streets must have a unique number regardless of the "trans route code" designation.

Route Number Extension: character 12 – A single letter used with the route number in local and municipal systems to guarantee uniqueness. It guarantees that there are no repeated NLF IDs due to duplicate route numbers. Route Description: character 13 – A single-letter code that defines a specific characteristic of a transportation route. Examples include A-Alternate, P-Proposed, B-Bypass. Note that * is the default.

Cardinal Direction: character 14 – A single letter code indicating that the route is part of a dual string combo created to indicate the direction of the route. Examples include: CCardinal, N-Non-cardinal.

NLF ID examples include the following: Interstate 70 in Franklin County: SFRAIR00070**C, Township road 104 in Shelby County: TSHETR00104**C

Private Road NLF ID examples:

Private municipal system road 80001 located in Van Wert County = PVANMR80001**C

Private township system road 80002 located in Van Wert County = PVANTR80002**C

Private county system road 80003 located in Van Wert County = PVANCR80003**C

Note: All Private Roads will have a road number assigned with a value between 80000 and 99999.

Note: Even though these roads are designated with a Route System Code of TR or MR or CR, they are not a governmentally owned facility. Note. Private road numbers do not duplicate across systems within a county. Note. Private roads will be assigned a Route System Code of TR (appears as if it was part of the Township Roadway System) or MR (appears as if it was part of the Municipal Roadway System). Private CR (appears as if it was part of the County Roadway System) roads will carry federal aid designations or connect public roadways.

Note: It is recommended that privately designated LRS elements that continues through many junctions or intersections and appears as one travel way, has one NLF ID assigned to it.

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