Roundabouts design policy
|Location||National Archives (see all files stored here)|
|File base||Series MT, subseries MT 95|
The 1950s and 60s seem to have been the key period in developing roundabouts from a very crude type of traffic management into a very sophisticated and versatile one. This file seems to be one of many very general "roundabouts" files that cover this period, and it contains a varied selection of correspondence on the subject.
There is little or no information relating to the development of roundabouts here, except for one quite singular exchange of letters between the Ministry of Transport and someone who can only be described as a roundabout enthusiast. He suggested building a junction with four flyovers to optimise a roundabout, braiding each entry point across the subsequent exit and providing left-turns bypassing the junction. The Ministry replied that in order to make the gradients to and from the flyovers acceptable, the central roundabout would have to be about the size of Derbyshire, and as a result it wasn't really a feasible design.
People with camera copies
Chris Marshall thinks he has a partial copy.