PTI

A public transport interchange is a physical location where passengers transfer between different bus routes, tram lines, train services, or combinations of these modes. It functions as a hub: a passenger arriving by one vehicle departs from a designated bay or platform to board another, typically within a short walking distance and often under a shared roof or covered structure.

The scale and complexity of PTIs varies enormously. A small PTI might be a single street corner where a bus stop and train station sit 50 metres apart. A major PTI resembles a traffic sorting yard: multiple bus bays arranged in a semicircle or grid, elevated platforms for trains or trams, ticket halls, and real-time information displays showing departures across all modes. Large PTIs in European cities handle 50,000 to 100,000 passenger transfers per day.

The design of a PTI determines its efficiency and usability. Walking times between platforms must be minimized; ideally under 5 minutes for the longest transfer. Weather protection is critical in temperate climates. Sight lines must allow passengers to see onward vehicle arrival notices from any waiting area. Ticketing integration is important: passengers may need a single fare card valid across modes, or at minimum seamless payment systems. Poor wayfinding, long transfers, or unreliable timetable coordination between services frustrates users and undermines the entire network.

Operational coordination is the hidden complexity. A PTI only functions when bus, tram, and train operators synchronize scheduled arrivals and departures. If a train is delayed by ten minutes, waiting buses must hold or loops must be extended to avoid passengers missing their connection. This requires real-time communication systems and operator agreements that often remain invisible to passengers.

The term PTI appears in transport planning documents, funding applications, and operator contracts across the UK and increasingly in European standards. It distinguishes genuine interchange facilities from mere proximity of stops, where services operate independently with no coordination. The acronym has become shorthand in planning circles for a strategic ambition: making it genuinely easier to switch between modes than to drive.