Wikipedia:Notability (Transportation) (failed proposal)

Streets and roads
Numerical length is not the definitive basis for the notability of a road, though longer roads are more likely to be considered notable than shorter ones. However, maps that classify roads as trunkline, primary, secondary, or tertiary roads can sometimes be used to distinguish major from minor roads. A major road is likely to have been mentioned in news reports or even guide books. Roads that are part of a national numbered highway system are also likely to be major trunkline routes for interregional travel and typically have sufficient historical significance.

Being numbered is not a requirement for a road to be notable. Many places do not have numbered road systems.

Bridges and tunnels
Bridges and tunnels are notable if they have been analyzed and discussed in multiple independent sources, discussing things such as their impact on a region. Simple inclusion on a map or atlas does not generally constitute sufficient discussion to provide a tunnel or bridge with notability.

Named bridges and tunnels on major roadways, such as George Washington Bridge, Lincoln Tunnel, Golden Gate Bridge, Chesapeake Bay Bridge-Tunnel, Tower Bridge are likely to be notable if they are important enough to be named. Unnamed bridges and tunnels (such as those over creeks, streams, and small rivers) and highway overpasses are generally not notable.

Transportation services
Transportation services, and associated items, are notable if they have been discussed in multiple, independent sources that discuss their impact on the region that they serve. Timetables, schedules, ticket sales, pricelists, and similar items do not serve to convey notability, but after notability of a service has already been established, these may be used to verify information.

National, continental, regional, and commuter rail services are most likely to be notable. Individual routes of these services and stations are notable if they meet the general notability guidelines. For a route or station on a smaller scale rail service to be notable, it must be discussed in considerable detail as to its impact on a region. While news stories about funding, routing controversies, etc. are generally not sufficient to convey notability, they may be used to verify the accuracy of information.

An agency (public or private) providing regularly scheduled mass transit services in a city, town, or region, no matter how small, is likely to be notable. While bus lines and routes are less likely to be notable enough to have their own articles, articles may be created if they have been discussed in considerable detail as to their impact on a region. News stories about funding, routing controversies, etc. are generally not sufficient to convey notability, but may be used to verify the accuracy of information.

Intercity bus services
Intercity bus services providing regularly scheduled, fixed-route service between two or more major cities or regions can be notable if it has been discussed in multiple, reliable sources. Notability is not limited to large companies like Greyhound Lines, but may also include smaller, regional companies like Chinatown bus lines or Megabus. Individual routes, if published, shall be described within the article.

Locally operated bus companies providing only chartered services are not likely to be notable. For these less significant items to be notable, they must have been discussed in considerable detail as to its impact on a region.

Aircraft
Aircraft types generally are notable. Aircraft subtypes needed some guidelines. See Notability (aircraft).

Airports
Airports can be notable if they have been discussed in multiple, reliable sources. Commercial airports are likely to be notable. See Notability (airports).

Airlines
Commercial airlines offering services to the public are notable. Cargo and charter only airlines are generally not notable. For these less significant items to be notable, it must have been discussed in considerable detail as to its impact on a region.