Fare zone 4 is an outer zone of Transport for London's zonal fare system used for calculating the price of tickets for travel on the London Underground, London Overground, Docklands Light Railway and, since 2007, on National Rail services.
For most visitors, travel on the Underground is limited to Zones 1-2 and the daily cap is £7.70. However, Heathrow Airport is in Zone 6, and the daily cap for travel between Zones 1-6 is £14.10.
If you have an Oyster with a valid travelcard for zones 1-3, and you travel outside those zones, you will pay an extension fare for only the zones that the travelcard doesn't cover. For zone 4, this should be the price for a trip within zone 4 only.
For those wishing to increase fitness or lose weight, exercising in heart rate zones 3 and 4 is sufficient. Such exercises are referred to as aerobic and should be undertaken 3-5 days per week in order to build strength.
Physiological adaptations are similar as mentioned above for Zone 3, just even more so, especially the ability to clear lactate. Intervals in Zone 4 can really improve your lactate threshold and help you either go faster or closer to your threshold for longer.
Within London, all London Underground, National Rail, London Overground, TfL Rail and Docklands Light Railway stations are assigned to six fare zones. Fare zone 1 covers the central area and fare zones 2, 3, 4, 5 and 6 form concentric rings around it.
Zone 1 covers the West End, the Holborn district, Kensington, Paddington and the City of London, as well as Old Street, Angel, Pimlico, Tower Gateway, Aldgate East, Euston, Vauxhall, Elephant & Castle, Borough, London Bridge, Earl's Court, Marylebone, Edgware Road, Lambeth North and Waterloo.
Zone 3 makes a first class caseDespite these increases, you will find many areas around the 93 tube stations in Zone 3 still have a relatively affordable housing market. Prices across Zone 3 as a whole average around £488,000; that's around a third cheaper than the £723,000 you'd pay in Zone 2.