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 was 97.3%, compared with 97.6% a year ago. The final stage of Gyratory removal works at Aldgate, combined with construction of the East-West and North-South Cycle Superhighways, continued to be disruptive this quarter, with knock-on delays in surrounding areas.
Other events causing significant disruption included a new phase of roadworks at Tottenham Court Road station and the closure of the Blackwall Tunnel on 24 May, due to the need to resurface following a major spillage.
Ongoing gas main replacement works in the King's Road, together with the start of a two-year eastbound closure of Tooley Street at London Bridge due to Network Rail works, also caused serious delays.
Later in the quarter, further events causing significant disruption included the introduction of a stricter weight limit on Hammersmith Bridge, the temporary closure of Kensington Church Street due to a large void under the carriageway, a westbound closure of Newgate Street from 11 June for gas main replacement works and flash flooding following exceptionally heavy rainfall on 23 June.
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 frequency night buses was maintained at a similar level compared with a year ago. However, EWT for high frequency night routes deteriorated, attributable mainly to overnight roadworks in central and inner east London.