{"schemaVersion":"1.0","id":"how-long-you-wait","dataset":"live-headways","title":"How long you actually wait","description":"The gap between trains, measured rather than timetabled.","methodology":"Median gap between consecutive arrivals per line, computed from live predictions across every station reporting at least four of them. Gaps over twenty minutes are discarded as the end of a timetable window rather than a service interval. A line can run plenty of trains and still make you wait if they are bunched, which is what this measures and a train count does not.","category":"transport","categoryLabel":"Transport","cadence":"live","placeholder":false,"landingPage":"https://londongraph.com/g/how-long-you-wait","markdown":"https://londongraph.com/g/how-long-you-wait/index.html.md","source":{"name":"TfL Unified API","url":"https://api.tfl.gov.uk/","licence":"TfL Open Data Licence","licenceUrl":"https://tfl.gov.uk/corporate/terms-and-conditions/transport-data-service"},"observations":null,"areaStatistics":null,"visualizations":[{"id":"overview","label":"Overview","description":"The gap between trains, measured rather than timetabled.","url":"https://londongraph.com/g/how-long-you-wait","renderer":"primary","default":true,"timeControl":"inherit","datasets":[],"transform":null,"controls":null,"metrics":[],"caveat":null},{"id":"network-map","label":"Network map","description":"Colour each Underground line by its measured median headway.","url":"https://londongraph.com/g/how-long-you-wait?view=network-map","renderer":"spatial","default":false,"timeControl":"inherit","datasets":[],"transform":null,"controls":null,"metrics":[{"key":"status","label":"Service status","unit":"TfL severity"},{"key":"headway","label":"Median measured headway","unit":"minutes"}],"caveat":null}],"availability":"metadata-only","note":"Live values are intentionally served by rate-limited application feeds, not this crawlable record."}