A 20mph speed limit will be rolled out to all the roads in Lambeth, except for the red routes maintained by Transport for London (TfL) . TFL will fund the street signage and road markings. In neighbourhoods where, despite the signage, speed continues to be a problem the council will consider other calming measures such as humps in 2017/18.
Lower traffic speeds reduce accidents and encourage more people to walk or cycle helping to improve air quality.
For details of the Lambeth Scheme see: http://www.lambeth.gov.uk/parking-transport-and-streets/streets-and-roads/lambeth-goes-20mph-guide . Also check out the “20 is plenty for us” campaign at http://www.20splentyforus.org.uk/