I'm not sure I understand your point njc97. Speed limits are not enforced adequately, that's my point - and whilst I welcome slower speeds on residential roads, i don't think painting '20' on the street will make a lot of difference. It is culturally acceptable to speed - look at today's front page of the Sun. It will require a concerted effort (a large part of which is enforcement) to change that. Also, fast, frequent public transport options in our Captial city (all parts of it, not just three quaters, needs to be ensured. Together, less traffic and slower traffic would make London a much more pleasant, efficient and prosperous place imo.