Surely it is up to everyone who drives to enforce the speed limit by not breaking the law. To date I've managed not to mug anyone, assault someone or shoplift. Why is speeding any different?
I'm not convinced by speed bumps, lots of LAs are abandoning them in favour of other methods such as planters, width restrictions or chicanes. These all require drivers to maintain better concentration to reduce speed and increase awareness - how many times have you been caught out by a speed bump. It didn't achieve its aim if you have.
I think the 20mph limit will make a difference. If (when actually, there is one child fatality and 37 serious injuries each week), a child is struck by a car they are much more likely to survive at 20 mph than 30. Condate, if it means you drive slowly through the 20mph limit and then slightly quicker to another destination to shop then, as a parent, I'm happy. As a cycling lowering the differential between car and bike is also great for safety and perception of safety, many E-Bikes can get someone to 15 MPH easily.
Interestingly there has been loads in the press recently about Low Traffic Neighbourhoods and the positive impact they are having in places. There are a number of reasons we need to re think our approach to roads, traffic and speed. One that I found interesting is the dominance of SatNav and Google Maps routing people through residential streets where prior to this people planned their own route and stuck to the main roads.
https://www.theguardian.com/world/2020/sep/25/rat-running-residential-uk-streets-satnav-apps another interesting fact from the DfT is that in 1990 there were 20 million registered vehicles on our roads. This year that figure stands at 38.5 Million, nearly double. It is no wonder streets are choked. Doubling the space dedicated to cars isn't an option so we have to move people out of them and onto other means of transport.
One final point is this and it relates to Covid. In Marple the only bottlenecks I have seen are when lots of people gather for the Pedestrian Crossings. Surely we should be prioritising the flow of people to minimise these groupings than prioritising those who are in a safe metal bubble. I'd suggest that having to stand in the rain waiting to cross a road to reach the shops is a greater barrier to shopping locally than driving a few miles and hour slower to reach them in the first place.