Sources & methodology

Where our information comes from and how we check it.

Primary sources

How we classify infrastructure

LabelMeaning
ExistingBuilt and in use
PlannedOfficially approved or sanctioned, not complete
ProposedAnnounced or under consideration; details may change

Numbers

We publish prices, distances and statistics only with a source and a date. Where we do not yet have reliable data, pages show a “pending” marker instead of an estimate.