Straight from the horse's mouth (ie. Transport for London!):
Our ref: SM010544/1DG
Date: 05 January 2005
Dear Dr Prasannan
Thank you for your email of 22 December 2005, with regards to the speed limit on the A13.
We determined the existing speed limits on the A13 in consultation with the Police in February 2003.
The most significant change in the speed limits that were in force prior to the A13 Improvement Schemes was the change from 50 mph to 40 mph from just east of Canning Town Flyover to just east of Renwick Road.
The following issues were considered in 2003:
· The emphasis placed by both Central Government and the Mayor of London on encouraging the use of cycling and walking as an alternative to the private car. TfL had instigated improvements to footway/cycleways along the full length of the new build schemes from Canning Town to Alfred's Way Railway Bridge and was examining ways of upgrading footway/cycleways east of this as far as Gale Street. (These works have since been completed) For the majority of this length the footway/cycleway would either be immediately adjacent to the carriageway or separated from the carriageway by only a narrow verge. A reduced traffic speed is considered to greatly improve the environment for walkers and cyclists.
· The link between lower speeds and reduced injury accidents is well established. The 40 mph zone was considered to be assisting the aim of both Central Government and the Mayor in reducing road traffic accidents.
· The major intersections at Canning Town, Prince Regent Lane, Woolwich Manor Way and Movers Lane were provided with grade separated junctions. However, there remain a number of side roads and also private accesses which enter/exit directly onto the A13. The 40 mph limit was considered to assist in making these accesses safer for use.
· The general requirement to progressively reduce traffic speed as motorists travel from the M25 into Central London.
· The Lodge Avenue flyover was provided with a 40 mph speed limit. It is considered necessary to retain this for safety reasons. The reduced speed limit to the west of Lodge Avenue is the only arrangement that would achieve the aim of progressively reducing speed limits.
· The length of the A13 subject to the 40 mph limit is urban/semi-urban in character. Reduced traffic speeds were considered to improve the environment for the local communities in the vicinity of the road.
· The length of the 40 mph zone is approximately 7.5 km. This translates to an additional journey time of less than 1.4 minutes when compared to the pre-existing 50 mph limit. This was considered a small price to pay for increased road safety and the benefits to other road users and the local community.
Thank you again for your email. I hope that this information has been helpful. Please contact me if you require any further assistance.
Surface Transport Communications