section_path: Ground transport/Inter-terminal transport
section_name: Inter-terminal transport
paragraph_text: Inter-terminal transport
  
  Terminals 2 and 3 are within walking distance of each other. Transfers from Terminals 2 and 3 to Terminals 4 and 5 are provided by Elizabeth line and Heathrow Express trains and the London Underground Piccadilly line. Direct transfer between Terminals 4 and 5 is provided for free by route H30, introduced by Diamond Buses on 1 December 2022.
  
  Transit passengers remaining airside are provided with free dedicated transfer buses between terminals. These use dedicated airside tunnels (Heathrow Cargo Tunnel between Terminals 2/3 and 4, Heathrow Airside Road Tunnel between Terminals 2/3 and 5) to minimise disruption to aircraft operations.
  
  The Heathrow Pod personal rapid transit system shuttles passengers between Terminal 5 and the business car park using 21 small, driverless transportation pods. The pods are battery-powered and run on-demand on a four-kilometre track, each able to carry up to four adults, two children, and their luggage. Plans exist to extend the Pod system to connect Terminals 2 and 3 to remote car parks.
  
  An underground automated people mover system known as the Transit operates within Terminal 5, linking the main terminal with the satellite Terminals 5B and 5C. The Transit operates entirely airside using Bombardier Innovia APM 200 people mover vehicles.