Inspired by the old Routemaster, it's the first bus in more than 50 years to be designed specifically for the Capital's streets.
You can get realtime service information for all London buses, including the Routemaster, by following our Twitter Bus Alerts feed.
More than 600 New Routemasters will enter passenger service by 2016.
Route 24 between Hampstead Heath and Pimlico became the first to fully convert to the new bus in June 2013. The New Routemaster also operates on route 11, which runs between Liverpool Street station and Fulham Broadway, route 9 (Hammersmith to Aldwych), route 390 (Notting Hill Gate to Archway) and route 148 (Camberwell Green to White City Bus Station).
A small number of New Routemasters also run on route 38 between Victoria and Hackney.
The bus has three sets of doors, each with Oyster card readers, making it easier to get on and off. Inside, there are two staircases, one near the front and one at the back, for easy access to and from the upper deck.
On the busier Central London routes, the bus will run with a conductor for most of the day. Conductors will not collect fares but will supervise the rear platform when they are on board, ensuring passenger safety when hopping on or off and providing travel advice.
When conductors are not present, the rear doors will be operated by the driver.
Oyster card holders or passengers using contactless payment cards can use any of the doors to board.
In central London, many stops have a roadside ticket machine. Where such a machine is provided, passengers paying with cash must buy their ticket from the machine before boarding. Elsewhere, passengers must board through the front door and buy a ticket from the driver. Passengers with a printed Travelcard or other printed pass or ticket must use the front door and show these to the driver.
When getting on or off using the open rear platform, please only do so when the bus is stationary and watch out for moving traffic.
The design makes use of lightweight materials, with glass highlighting key features and producing a light and airy feel inside the bus. The interior and external styling of the bus was developed with help from our design partner, Heatherwick Studio. The buses are manufactured by Wrightbus in Northern Ireland.
The bus has a step-free gangway on the lower deck from the front to the back, allowing ease of access for people with mobility impairments and passengers with buggies. There is a large wheelchair bay directly opposite the ramped centre door. Passengers are alerted to the next stop by audio and visual announcements. There's also a T-Loop system which transmits announcements for passengers with hearing aids.
The bus uses the latest green diesel-electric hybrid technology and is the best performing bus of its kind in the world. In test conditions the New Routemaster produced around half the carbon dioxide and a quarter of the particulate matter and nitrogen oxides of conventional diesel buses and is more fuel efficient.
A battery pack powers the electric motor which drives the wheels on the bus. The battery is charged by a generator and through regenerative braking (where the system recycles the energy lost during the braking motion). Stop-start technology means the engine only runs when it needs to charge the battery.