But council chiefs say speeds have not changed significantly where the new limit has been introduced - and on some roads they have actually gone up.
Without policing of the lowered speed limit, I doubt that anyone was surprised that the new 20 mph limit was effectively ignored. People in London may be more likely to refrain from using their mobiles while driving today than they were six months ago; this is not due to an increase in awareness of the dangers that they pose (they still think that they can multitask fine) or even the increase in the severity of the penalties, but because they know that policing has increased and they fear being caught.
Cycling accidents have dropped 42pc across Manchester since 2012, but in the areas with 20mph limits the figure is between 12pc and 16pc.
I think that the above fact should be ignored. A decrease of cycling accidents of between 12pc and 16pc in the new 20 mph zones after a decrease in the average motor speed of just 0.7 mph indicates that there have been other infrastructure initiatives, or a general awareness campaign.
The article shows an image of Meltham Avenue in Withington (reproduced below). The scene struck me as having quite wide roads, low levels of parked traffic that can hide pedestrians from motorists and also a moderate housing density.
As the se23 forum brings together Honor Oak and Forest Hill, I took Devonshire Road as a metaphorical equivalent and example, dropping a pin in its middle and looking on Google Streetview (image below). I don't want to labour the point, but one of these streets has a greater density of residents, more schools in locality, narrower pavements, narrower roads, more parked cars to hide pedestrians from cars and vice versa. If you think that the road in the below image is suitable for a 30 mph speed limit, please say so. If you think that the road in the below image is too narrow for a driver to attain 30 mph on, please take some time to observe it when traffic is relatively busy and drivers and accelerating, braking and swerving into passing spaces.