domd1979 said:
20mph zones have been shown to reduce accident rates.
And if a 25mph speed limit, which is what I favour if you're going to go down the route of saying large tracts of the country should have reduced speeds, existed as an entity then it would be demonstrated to reduce accident rates also.
Tyred's point of view is a legitimate one to have. The only problem I have with it is that the "certain times of day" can lead to drivers misbehaving wildly outside of their hours as it in their minds it legitimises their speeding. There are some 20 zones that are meant as that for large windows of time as that is their nature. I used to live near one. There are others that do genuinely only need to be 20mph say at school time (smaller in number than many people think). Some areas of the country favour the flashing orange lights and signs.
Plans do exist to make virtually everywhere 20mph, it's just like in my local authority they are obsessed with speed bumps and the lavish trimmings of traffic calming so only have enough resources to do 2 areas per year without intervention, hence it'll take half a century to achieve as the city is split into 100 areas. I just think if you're going to go down that route, you either have 20mph areas in limited areas that are rigidly enforced by speed cameras and mobile units or if you want practically everywhere to have lower speeds I advocate the new 25mph urban speed limit.