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20's plenty...

[Further to my earlier posts on this matter:]

It is obvious that introducing 20mph limits for residential streets in Norwich would reduce traffic casualties. And what could be more important than that?

But not only that; if we reduced the speed limit, we would reduce CO2 emissions, at the same time. Here's why:
'Modal shift' is the key to reducing carbon emissions. Cars driving too fast (and resultantly dangerous streets) is the
key reason why people do not shift to getting about by bike and foot. Ergo: reducing speed
limits is the key to reducing emissions.

[Here are some good links on the emerging cameras technology that will enable 20mph zones to be policed properly:

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More on why 20's plenty -- without need for any further 'trials'...

There are a number of reasons for setting a default speed of 20mph throughout the 'unclassified' road network in residential parts of a city such as Norwich. Most important perhaps is that of driver recognition as to what the speed limit is. If you have 20 mph as the default then you not only establish this limit clearly, but you also adjust the driver's recognition as to what is the "normal" speed in such residential areas. The most important aspect is that drivers set 20 mph as the norm with those 30 mph areas or roads being seen as 50% faster, rather than seeing 30 mph as the norm with 20 mph as 33% slower. The psychological adjustment of normal speeds in residential areas is key to the success of reducing speeds and therefore danger to pedestrians and cyclists. Therefore any trial, pilot or whatever, that only implements 20 mph in a tiny proportion of the city is not modelling 20's Plenty in any realistic manner.   When considering the val...
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