Maine Highway Classification
| This is a draft document. Comments, feedback, and improvement welcome. Please do not start re-tagging Maine highways until community consensus has been reached. |
This page describes Maine-specific determinations for implementing US Highway Classification values.
Maine uses the same standard as defined on the US Highway Classification page. The top tier of classification is the motorway+trunk network.
Motorways
highway=motorway should only be applied to roadways that are either signed Interstate highways or have ALL of the following characteristics:
- Grade separation
- Limited access via on/off ramps
- No at-grade intersections or traffic signals (although on-ramps may have traffic control devices)
- Divided carriageways
- Designed and maintained to support high speeds over long distances
In particular, roads which briefly exhibit motorway-like characteristics for short distances should not be tagged as a motorway. For these roads consider using expressway=yes combined with a classification that indicates the road's connectivity importance in the region or local area.
Trunks
Trunks are the most important non-motorway highways in an area. Non-motorway routes connecting major settlements are considered trunk roads (also known as "major inter-city roads"). These roads are signed US or state highways.
Important Regional Centers
Sources:
- https://en.wikipedia.org/wiki/Metropolitan_statistical_area
- https://en.wikipedia.org/wiki/Micropolitan_statistical_area
- https://en.wikipedia.org/wiki/List_of_municipalities_in_Maine
The following communities in and around Maine are to be concidered the most important regional centers:
| City | Notes |
|---|---|
| Portland | Includes surrounding Metropolitan area (South Portland, Westbrook, Scarborough, Cape Elizabeth, etc) |
| Bangor | Includes surrounding Metropolitan area (Brewer, Orono, Old Town, etc) |
| Lewiston/Auburn | Includes surrounding Metropolitan area |
| Augusta | Includes surrounding Metropolitan area |
| Waterville | |
| Biddeford/Saco | |
| Sanford | |
| Brunswick | Includes Topsham |
| Presque Isle | |
| Bath | |
| Ellsworth | |
| Caribou | |
| Rockland | |
| Windham | Prominent enough to be stand-alone from the Portland metro area as a destination? |
| York | |
| Kennebunk/Wells | |
| Falmouth | |
| Lisbon | |
| Yarmouth | |
| Old Orchard Beach | |
| Skowhegan | |
| City | Notes |
|---|---|
| Potsmouth, NH | (and Boston, MA beyond) |
| Saint John, NB | |
| Rochester, NH | |
| Concord, NH | |
| Burlington, VT | |
| Montreal, QC | |
| Sherbrooke, QC | |
| Quebec City, QC | |
| Fredricton, NB | |
| Edmunston, NB |
Trunk Roads
The following US and state routes are principal roads between important population centers not serviced by interstates.
| Route | Population Centers Served | Notes |
|---|---|---|
| US 2 (West of I-95 @ Newport) | Bangor & Skowhegan to points west (Burlington, VT; Montreal, QC) | |
| ME 9 | Bangor & I-95 corridor to Saint John, NB | |
| US 1 (from 295-Ellsworth) | Brunswick; Bath; Rockland; Belfast; Ellsworth | |
| US 1A | Belfast; Bangor | |
| ME 3 | Augusta; Belfast; Ellsworth; Bar Harbor | |
| US 201 (north of I 95) | Waterville, Skowhegan; Quebec City, QC | |
| US 202/ME 11 | Rochester, NH; Sanford | |
| ME 111 | Sanford; Biddeford | |
| US 302 | Portland; Montreal, QC | |
| US 1 (north of I 95) | Bangor; Presque Isle; Caribou; Edmunston | |
Additional confirmation data:
- The NHS desigation of routes does not necessarily require trunk status, but can be a useful comparison.
Primary
Primary routes are routes connecting smaller communities, or linking other primary, trunk, or motorway roads to other roads or places. Use this tag on State or US routes connecting multiple settlements or other important roads, but not important enough to receive trunk classification. This tag can also be used on very important city roads.
Secondary
Secondary routes are often minor state routes that link to many even small settlements.
Tertiary
Tertiary routes are town or city roads. A town road that serves as any sort of through route should be considered a tertiary road regardless of paved status.
Unclassified
Use the Unclassified tag for any very small linking road, or for any non-service road that does not serve a contained neighborhood.
Residential
Use the Residential road tag for roads that are not through routes, such as roads in subdivisions, or dead-end rural roads that serve houses.
Track
Tracks are roads that are mainly used for forestry and agriculture. Track roads are not maintained by the city or state for traffic to travel on. These would be roads serving: A managed forest used for forestry, A national forest or Wildlife Management Area, or a farmer's field. For graded Forest Service roads, you can opt to use unclassified or tertiary instead.
Communication
This page is discussed on the #local-maine Channel of the OSMUS Slack.