Thursday 25 October 2012 8.06am
This is a great example of the stupidity of 20mph limits.
It makes a great headline, but does nothing to enhance safety or reduce congestion.
Most of the time this r'bout is so busy that anyone driving safely and with any consideration won't be able to get above 20mph even if they were trying. (N.B. anyone who isn't driving in this way is already committing an offence, and probably won't pay any attention to a 20mph limit anyway).
The only thing the 20mph limit will do is to make anyone driving across there in the dead of night when it's empty (and *possibly* safe to exceed 20mph) liable to get a ticket.
James raises the example of Exhibition Road (again). The great thing about deristricted/shared (or whatever I'm supposed to call it) space is that it makes everyone use their common sense and be considerate. Applying that approach to the r'bout would mean that most of the time traffic was below 20, but that, when the junction was relatively empty, traffic would go faster.
20mph limits are a blunt tool. The problem is more sophisticated.
...if you press it, they will come.