Draft:Idaho/Highway Classification

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	Motorway
Other Urban Fwys & Expressways	Motorway/Trunk (See where motorway can apply)
Other Principal Arterials	Trunk/Primary (see below)
Minor Arterial	Primary/Secondary
Major Collector	Tertiary/Secondary
Minor Collector	Tertiary
Local	Residential/Unclassified

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 ↔ Canada	Completed in changesets 115534719, 115535102, and 115536538	completed
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	completed
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

• Some routers make the assumption that pedestrians and bicycles are not allowed on highway=trunk. When upgrading ways to highway=trunk or highway=trunk_link be sure to add explicit bicycle=yes and foot=yes access tags.

Status

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.