Quote

12-3-2008
The Mayor of London, Ken Livingstone, today said that he would not be changing the rules of London’s major roads to allow motorbikes to ride in bus lanes.  His decision follows the publication of a report into a trial, which has provided no clear evidence of safety benefits to motorcyclists and potential disbenefits to pedestrians and cyclists
...
“The final published report shows that at present, the only robust aspect of the evidence is the Tanner Test, which shows only a very small safety benefit for motorcyclists against a larger disbenefit for other vulnerable road users.  On this basis I do not propose to further allow motorcyclists to use bus lanes
...
TfL Managing Director of Surface Transport, David Brown said:
...“We undertook this trial to see if we could improve road safety for all road users, including pedestrians and cyclists. The results to date do not support a change in policy in this area.
...
The report can be found on the GLA website at http://www.london.gov.uk/mayor/transport/streets.jsp
The key Tanner Test results from the report are [given]
...

http://www.london.gov.uk/mayor/transport/docs/p2ws_bus_lanes_report.pdf

Quote

Other London borough schemes
There have been other trials in three London boroughs, Westminster, Kingston and Richmond. Table 8 gives a summary of the performance of each scheme.
In September 2005 the City of Westminster introduced the measure in the form of a trial on a total of ten lengths of bus lane. The overall impact suggests that there are safety benefits for all vulnerable road users. In the 14 months of the measure, the figures have returned a 24% reduction in pedestrian casualties, and 17% reduction for both pedal cycles and P2Ws.
There are four schemes introduced in the Royal Borough of Kingston, with two having collected 36 months after data sets and two with 31 months data sets. The collective casualty figures have shown reductions for all vulnerable road users with pedestrian casualties down by 17%, P2Ws down by 29% and pedal cycle casualties down by 50%.
Two schemes have been introduced in Richmond. These schemes have been operating for 31 months and have seen a 33% reduction in pedestrian casualties, and 67% reduction in P2W casualties. There has, however, been an increase from 0 to 3 in pedal cycle injuries.
However, none of these schemes has been assessed against a control, so comparisons cannot be made of the statistical significance of the results compared with general trends.

see http://www.tfl.gov.uk/assets/downloads/Ptw-bus-lane-project-2004-results.pdf
Status: 18-month review report
Version 4
Date: 19/11/04

Quote

The report examines each of the three trial sites under each of these monitoring categories and considers two control corridors as a comparison. The report concludes that further consideration of casualty data is needed. Therefore, a further 18-months of casualty data is to be collected for the trial sites, together with the control corridors. In addition, casualty analysis will be undertaken at the four borough routes that have been introduced since the TfL trials commenced.
...
In September and October 2002, TfL introduced three pilot schemes on the TLRN whereby riders of powered two wheelers (motorcycle, scooters and mopeds, hereafter referred to as ptws) were permitted to use bus lanes during the times of bus lane operation.
...
Arguments against permitting ptws into bus lanes centre on the principle of private motorised vehicles being allowed access to bus lanes, additional vehicles in bus lanes having a negative impact on other users (notably buses and cyclists), and a potential increase in road safety conflicts between ptws and pedal cyclists and between ptws and unaccustomed pedestrians.
...
Four further schemes in London, two in Richmond and two in Kingston have recently been introduced by the relevant London Boroughs (not as part of TfL's trials).
...
Note: the congestion charge was introduced after the ptw trials started, ... traffic entering the congestion charging zone is down by 18%, and inbound PTW traffic is up by 15% on 2002
...
For the trial sites, in the seventeen months since the beginning of the experiments the overall number of collisions fell by 9% and those involving ptws fell by 11%. In comparison on the control corridors the overall number of collisions fell by 6.5% and those involving ptws remained constant. For the TLRN as a whole the overall number of collisions fell by 14% and those involving ptws fell by 18%.
.....
Pedal cyclists have been the most vociferous opponents of permitting powered two wheelers into bus lanes
...