Most bus services in London are run by private operators which have been awarded a contract by us. The contract is then managed by London Bus Services Ltd.
All applicants have to tender for any service they would like to run.
A small number of bus services in London are run commercially and are not part of our competitive tender process. Operators interested in running this type of service need to apply for a London Service Permit.
We operate a system called iBus on all London Buses.
Using a combination of technologies including satellite tracking, iBus can pinpoint the location of buses, relaying information between the driver, garage and central control point.
Live bus arrival information for all bus stops is available online, on smartphones and via SMS. It is also available via signs at more than 2,600 bus stops.
Our interactive maps allow people to search by postcode, street name, route number, stop name or place of interest.
We are well on our way to having Europe's largest fleet of hybrid buses. Around 800 New Routemasters are among the roughly 2,000 diesel-electric vehicles.
These vehicles use a combination of an ordinary diesel engine and an electric motor and reduce emissions of local pollutants and CO2 by 30% compared to conventional buses.
We have also introduced eight hydrogen fuel cell single deck buses onto Route RV1, operating between Covent Garden and Tower Hill. Two more vehicles will join in 2017. The only emission from these buses is water.