We measure network performance by comparing the number of kilometres a route has done in the last quarter.
We compare each quarter to the same quarter of the previous year, rather than the last quarter of the same year. This is because factors affecting performance, like traffic conditions, can vary depending on the time of year, so this system makes it possible to identify underlying trends.
Scheduled kilometres may not be met because journeys are cancelled or suspended due to:
Quality of service indicators (QSI) are used to monitor service reliability.
We ask a sample of passengers to give a score out of 100 on a wide range of bus service features, based on the journey they have just made. Passengers are carefully selected each quarter to represent all bus passengers in London.
Recent figures can be found in the latest quarter summary document below.
A passenger journey is defined as one ride on a single vehicle - not a bus trip from A to B as this may include more than one bus ride.
Statistics include all London Buses' contracted services but exclude any non-scheduled kilometres, London Service Permit routes and other special services.
The following reports summarise performance statistics (based on a variety of criteria):
We monitor the speeds of buses to understand the impacts of changing road network conditions. Bus speeds include time spent stationary (for example at traffic lights and at bus stops). Bus speeds are available for the entire network, by borough, and by route.
The proportion of scheduled kilometres operated this quarter improved compared with the same quarter a year ago. Traffic delays reduced, following completion of the construction phase of some major works such as the Aldgate gyratory removal and North-South Cycle Superhighway. Results for quarter 2 last year were adversely affected by industrial action on the Underground.
Events causing significant disruption included the two-year eastbound closure of Tooley Street at London Bridge due to Network Rail works, a westbound closure of Newgate Street for gas main replacement works, ongoing gas main replacement works in the King's Road and the introduction of a stricter weight limit on Hammersmith Bridge. Kilometres lost for staff reasons were adversely affected by three one-day strikes by drivers at Tower Transit.
Quality of Service Indicators for high frequency daytime services were similar to the same quarter last year. Further measures have been introduced to protect service reliability against disruption from a series of major roadworks in Central and Inner London. Punctuality of low frequency services deteriorated compared to a year ago due to an adverse trend in operating conditions in Outer London.
Punctuality of low and high frequency night buses improved compared with a year ago.