Draft:Idaho/Highway Classification

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This is a proposal for standardized road classifications in Idaho as part of a larger discussion about classification standards nationwide (United States/Highway classification). You're free to add on and edit the contents of this page.

Functional class

The State Highway System Functional Class Map by IDT is a good starting point to determine the OSM classification of roads in Idaho.

Functional class to OSM highway classifications
Federal Functional Class OSM Highway Classification
  • Interstate
  • Other Urban Fwys & Expressways
Motorway/Trunk (See where motorway can apply)
  • Other Principal Arterials
Trunk/Primary (see below)
  • Minor Arterial
  • Major Collector
  • Minor Collector
  • Local

Trunk roads

Idaho currently uses trunk roads sparingly. It might be helpful to distinguish primary roads that are more important to others and not just look at the physical characteristics of the road.

Regional centers

The following cities in and around Idaho are considered important regional centers:

  • Boise, ID
  • Ontario, OR
  • Mountain Home, ID
  • Idaho Falls, ID
  • Rexburg, ID
  • Blackfoot, ID
  • Spokane, WA
  • Coeur d'Alene, ID
  • Twin Falls, ID
  • Pocatello, ID
  • Sandpoint, ID
  • Lewiston, ID
  • Moscow, ID
  • Hailey, ID
  • Logan, UT
  • Jackson, WY
  • Missoula, MT
  • Kalispell, MT
  • Bozeman, MT
  • Rock Springs, WY
  • West Yellowstone, MT
  • Winnemucca, NV

Proposed trunk routes

The following routings are the principal routes between pairs of important population centers, and not serviced by highway=motorway, and thus should be tagged highway=trunk. Other routes not listed here might be listed here.

Trunk routing Destinations Notes Status
Highways From To
US 95 OR state line CA border Winnemucca, NV ↔ Ontario, OR ↔ Lewiston, ID ↔

Moscow, ID ↔ Coeur d'Alene, ID ↔ Sandpoint, ID ↔


Completed in changesets 115534719, 115535102,

and 115536538

ID 55 US 95 (Marsing) US 95 (New Meadows) Winnemucca, NV ↔ Boise, ID ↔ Lewiston, ID completed
US 93 NV state line I 84 I 80 corridor ↔ Twin Falls, ID Completed in changesets 115267199, 123707338, and 123768691 completed
ID 61 WY state US 89 US 30 corridor ↔ US 89 corridor Connects to US 30 via WY 89

Completed in changeset 126024559

ID 13 US 95 US 12 Boise, ID ↔ Missoula, MT Connector between US 95 and US 12 completed
US 30 I 15 WY state line Pocatello, ID ↔ Rock Springs, WY Completed in changeset 121675383 completed
US 26 I 15 WY state line Idaho Falls, ID ↔ Rock Springs, WY Completed in changeset 121488180 completed
US 20 I 15 WY state line Idaho Falls, ID ↔ Rexburg, ID ↔ West Yellowstone, WY Completed in changeset 123337516 completed
US 12 WA state line MT state line Lewiston, ID ↔ Missoula, MT Partially completed in changeset 117583491 completed
US 2 WA state line MT state line Spokane, WA ↔ Sandpoint, ID ↔ Kalispell, MT Completed in changeset 126956141 completed

When upgrading

  • Tag your changesets with #us-highway-classification and a state-prefixed version (like #id-highway-classification). This will allow tracking of this effort in other tools and let us get some ballpark numbers later on of what ended up going into this project on the editing side.
  • Make sure to also upgrade links


Completed: Route has been upgraded

Partial: Route has been partially upgraded

Approved: Route has been approved by another person

Proposed: Route might be a trunk

What about existing trunk roads?

Existing trunk roads in Idaho based off physical characteristics had an expressway=yes tag added to them. Trunk stubs should be downgraded to the class it is after the expressway ends.